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Document and Entity Information - shares	6 Months Ended
Document and Entity Information - shares	Jun. 29, 2013	Aug. 05, 2013
Document Information [Line Items]
Entity Registrant Name	FORMFACTOR INC.
Entity Central Index Key	0001039399
Current Fiscal Year End Date	--12-28
Entity Filer Category	Accelerated Filer
Document Type	10-Q
Document Period End Date	Jun. 29, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Common Stock, Shares Outstanding		54,533,417
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes

Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 29, 2013	Jun. 30, 2012	Jun. 29, 2013	Jun. 30, 2012
Revenues	$ 62,733	$ 54,813	$ 115,353	$ 89,619
Cost of revenues	46,328	38,646	89,873	69,296
Gross profit	16,405	16,167	25,480	20,323
Operating expenses:
Research and development	10,915	10,935	21,844	21,782
Selling, general and administrative	13,487	11,531	28,105	22,679
Restructuring charges, net	92	136	4,072	103
Loss on sale of subsidiary	300		300
Impairment of long-lived assets	121	61	179	229
Total operating expenses	24,915	22,663	54,500	44,793
Operating loss	(8,510)	(6,496)	(29,020)	(24,470)
Interest income, net	96	182	203	394
Other income, net	209	546	632	956
Loss before income taxes	(8,205)	(5,768)	(28,185)	(23,120)
Provision for (benefit from) income taxes	202	(1,551)	(5)	(1,449)
Net loss	$ (8,407)	$ (4,217)	$ (28,180)	$ (21,671)
Net loss per share:
Basic and Diluted (In dollars per share)	$ (0.16)	$ (0.08)	$ (0.52)	$ (0.44)
Weighted-average number of shares used in per share calculations:
Basic and Diluted (In shares)	54,105	49,817	53,886	49,652

Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 29, 2013	Jun. 30, 2012	Jun. 29, 2013	Jun. 30, 2012
Net loss	$ (8,407)	$ (4,217)	$ (28,180)	$ (21,671)
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	(486)	264	(1,565)	(274)
Unrealized gains (losses) for the period	(73)	15	(122)	(106)
Net (gains)/losses reclassified into earnings	0	(1)	0	(1)
Other comprehensive income (loss), net of tax	(559)	280	(1,687)	(379)
Comprehensive loss	$ (8,966)	$ (3,937)	$ (29,867)	$ (22,050)

- Definition

The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the reporting entity. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, but excludes any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

+ References + Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

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+ Details

- Definition

Net of tax amount of the appreciation (loss) in value of unsold available-for-sale securities attributable to the parent entity. Excludes amounts related to other than temporary impairment (OTTI) losses.

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- Definition

Net of tax amount of unrealized holding gain (loss) before reclassification adjustments and transfers on available-for-sale securities.

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+ Details

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 29, 2013	Dec. 29, 2012
Current assets:
Cash and cash equivalents	$ 57,160	$ 72,243
Marketable securities	97,362	93,545
Accounts receivable, net	38,964	28,919
Inventories	26,130	23,616
Deferred tax assets	4,204	4,613
Refundable income taxes	1,568	5,667
Prepaid expenses and other current assets	6,191	10,569
Total current assets	231,579	239,172
Restricted cash	421	318
Property, plant and equipment, net	39,630	45,515
Goodwill	29,958	30,994
Intangibles, net	65,625	74,276
Deferred tax assets	4,076	4,207
Other assets	989	1,200
Total assets	372,278	395,682
Current liabilities:
Accounts payable	24,181	21,015
Accrued liabilities	13,808	17,270
Capital leases, current portion	503	573
Income taxes payable	446	0
Deferred revenue	6,113	6,189
Total current liabilities	45,051	45,047
Long-term income taxes payable	2,786	3,028
Capital leases, net of current portion	39	340
Deferred rent and other liabilities	7,521	8,009
Total liabilities	55,397	56,424
Commitments and contingencies (Note 18)
Stockholders' equity:
10,000,000 shares authorized; no shares issued and outstanding at June 29,2013 and December 29, 2012, respectively	0	0
250,000,000 shares authorized; 54,237,172 and 53,286,703 shares issued and outstanding at June 29, 2013 and December 29, 2012, respectively	55	54
Additional paid-in capital	688,646	681,157
Accumulated other comprehensive income	28	1,715
Accumulated deficit	(371,848)	(343,668)
Total stockholders' equity	316,881	339,258
Total liabilities and stockholders' equity	$ 372,278	$ 395,682

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - $ / shares	Jun. 29, 2013	Dec. 29, 2012
Stockholders' Equity:
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	250,000,000	250,000,000
Common stock, shares issued	54,237,172	53,286,703
Common stock, shares outstanding	54,237,172	53,286,703

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 29, 2013	Jun. 30, 2012
Cash flows from operating activities:
Net loss	$ (28,180)	$ (21,671)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	14,572	5,419
Amortization of discount on investments	145	67
Stock-based compensation expense	6,167	6,521
Deferred income tax provision	146	55
Provision for (recovery of) doubtful accounts receivable	(19)	30
Provision for excess and obsolete inventories	4,879	2,502
Loss on disposal and write-off of long-lived assets	318	32
Impairment of long-lived assets	179	229
Loss on sale of subsidiary	300	0
Non-cash restructuring	2,743	0
Foreign currency transaction losses	171	1,141
Changes in assets and liabilities:
Accounts receivable	(10,667)	(15,137)
Inventories	(7,558)	(4,815)
Prepaid expenses and other current assets	3,494	(116)
Refundable income taxes	4,357	852
Other assets	453	0
Accounts payable	5,124	7,780
Accrued liabilities	(2,562)	2,305
Income taxes payable	215	(1,537)
Deferred rent and other liabilities	31	85
Deferred revenues	97	1,434
Net cash used in operating activities	(5,595)	(14,824)
Cash flows from investing activities:
Acquisition of property, plant and equipment	(5,071)	(3,928)
Use of cash from sale of subsidiary	(266)	0
Purchases of marketable securities	(51,053)	(69,931)
Proceeds from maturities of marketable securities	44,970	94,500
Change in restricted cash	(103)	0
Proceeds from sale of marketable securities	2,000	0
Net cash provided by investing activities	(9,523)	20,641
Cash flows from financing activities:
Proceeds from issuances of common stock, net of issuance costs	1,326	1,179
Purchase and retirement of common stock	(5)	0
Payments made on capital leases	(331)	0
Net cash provided by financing activities	990	1,179
Effect of exchange rate changes on cash and cash equivalents	(955)	(1,222)
Net increase (decrease) in cash and cash equivalents	(15,083)	5,774
Cash and cash equivalents, beginning of period	72,243	139,049
Cash and cash equivalents, end of period	57,160	144,823
Supplemental cash flow disclosures:
Changes in accounts payable and accrued liabilities related to property, plant and equipment purchases	1,111	217
Income and property taxes refunded, net	$ (4,397)	$ (843)

Basis of Presentation and Summary of Significant Accounting Policies	6 Months Ended
	Jun. 29, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation and Summary of Significant Accounting Policies	Basis of Presentation and Summary of Significant Accounting Policies Basis of presentation. The accompanying unaudited condensed consolidated interim financial statements of FormFactor, Inc. and our subsidiaries have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) and pursuant to the instructions to Form 10-Q and Article 10 of Regulation S-X of the U.S. Securities and Exchange Commission (the “SEC”). Our interim financial statements do not include all of the information and footnotes required by generally accepted accounting principles for annual financial statements. In the opinion of management, all adjustments (consisting only of normal recurring adjustments) considered necessary to fairly present our financial position, results of operations and cash flows have been included. Operating results for the three months ended June 29, 2013 are not necessarily indicative of the results that may be expected for the year ending December 28, 2013, or for any other period. The balance sheet at December 29, 2012 has been derived from the audited consolidated financial statements at that date but does not include all of the information and footnotes required by GAAP for complete financial statements. The condensed consolidated financial statements include our accounts as well as those of our wholly-owned subsidiaries after elimination of all significant inter-company balances and transactions. The preparation of condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in our condensed consolidated financial statements and accompanying notes. Actual results could differ from those estimates, and may result in material effects on our consolidated operating results and financial position. These financial statements and notes should be read with the consolidated financial statements and notes for the year ended December 29, 2012 included in our Annual Report on Form 10-K filed with the SEC on March 13, 2013. Certain prior year amounts have been reclassified to conform to current year presentation. Fiscal year. We operate on a 52/53 week fiscal year, whereby the fiscal year ends on the last Saturday of December. Fiscal 2013 will end on December 28, 2013, and will consist of 52 weeks. Significant Accounting Policies. Our significant accounting policies have not changed during the three and six months ended June 29, 2013 from those disclosed in our Annual Report on Form 10-K for the year ended December 29, 2012.

- Definition

The entire disclosure for the organization, consolidation and basis of presentation of financial statements disclosure, and significant accounting policies of the reporting entity. May be provided in more than one note to the financial statements, as long as users are provided with an understanding of (1) the significant judgments and assumptions made by an enterprise in determining whether it must consolidate a VIE and/or disclose information about its involvement with a VIE, (2) the nature of restrictions on a consolidated VIE's assets reported by an enterprise in its statement of financial position, including the carrying amounts of such assets, (3) the nature of, and changes in, the risks associated with an enterprise's involvement with the VIE, and (4) how an enterprise's involvement with the VIE affects the enterprise's financial position, financial performance, and cash flows. Describes procedure if disclosures are provided in more than one note to the financial statements.

+ References + Details

Recent Accounting Pronouncements and Other Reporting Considerations	6 Months Ended
	Jun. 29, 2013
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Recent Accounting Pronouncments and Other Reporting Considerations	Recent Accounting Pronouncements and Other Reporting Considerations Comprehensive Income In February 2013, the FASB issued revised guidance on “Comprehensive Income: Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income.” The revised guidance does not change the current requirements for reporting net income or other comprehensive income in financial statements. However, the revised guidance requires an entity to provide information about the amounts reclassified out of accumulated other comprehensive income by component. In addition, an entity is required to present, either on the face of the statement where net income is presented or in the notes, significant amounts reclassified out of accumulated other comprehensive income by the respective line items of net income but only if the amount reclassified is required under GAAP to be reclassified to net income in its entirety in the same reporting period. For other amounts that are not required under GAAP to be reclassified in their entirety to net income, an entity is required to cross-reference to other disclosures required under GAAP that provide additional detail about those amounts. The revised guidance was adopted by the Company for its fiscal year 2013 commencing on December 30, 2012 and did not have a material effect on the Company's financial position, results of operations or liquidity.

- Definition

Represents disclosures of new accounting pronouncements that have been issued but not yet adopted, including (1) description of the new pronouncement, the date that adoption is required and the date that the entity plans to adopt, if earlier; (2) discussion of the methods of adoption allowed by the pronouncement and the method expected to be utilized by the entity, if determined; (3) discussion of the impact that adoption of the pronouncement is expected to have on the financial statements of the entity, unless such impact is not known or reasonably estimable (in which case, a statement to that effect should be made) and; (4) disclosure of the potential impact of other significant matters that the entity believes might result from the adoption of the pronouncement (for example, technical violations of debt covenant agreements and planned or intended changes in business practices). Also represents disclosures of new accounting pronouncements that have been adopted recently including (1) the nature of and reason for the change, including an explanation of why the newly adopted accounting principle is preferable; (2) the method of applying the change and (i) a description of prior-period information that has been retrospectively adjusted, if any (ii) the effect of the change on income from continuing operations, net income (or other appropriate captions of changes in in the applicable net assets or performance indicator), any other affected financial statement line item, and any affected per-share amounts for the current period and any prior periods retrospectively adjusted (iii) the cumulative effect of the change on retained earnings or other components of equity or net assets in the statement of financial position as of the beginning of the earliest period presented (iv) if retrospective application is impracticable, the reasons therefore and a description of the alternative method used to report the change.

+ References + Details

Acquisition

6 Months Ended

Jun. 29, 2013

Business Combinations [Abstract]

Acquisition

On October 16, 2012, we acquired Astria Semiconductor Holding, Inc., including its subsidiary MicroProbe, Inc. (together “MicroProbe”), with Astria continuing as the surviving corporation and as a wholly-owned subsidiary of FormFactor (the "MicroProbe Acquisition"). We originally estimated the acquisition price and recorded the fair values of the MicroProbe assets acquired and liabilities assumed on October 17, 2012 at the values noted in the Original Values column below. In the first fiscal quarter of 2013, we made adjustments to the acquisition price related to working capital adjustments pursuant to the relevant acquisition agreement together with adjustments to preliminary measurements of net tangible assets. In the second fiscal quarter of 2013, we made further adjustments to preliminary measurements of fair values of net tangible assets, resulting in the revised values noted below (in thousands):



	Original Values			Revised Values
Tangible net assets	$	31,842		$	33,562
Intangible assets	77,600			77,600
Deferred income tax liabilities	(26,663		)	(26,663		)
Goodwill	30,994			29,958
Total acquisition price	$	113,773		$	114,457

The total acquisition consideration of $114.5 million was determined based on the terms of the relevant acquisition agreement which consisted of a) $100.0 million in cash, subject to a $2.6 million decrease based on MicroProbe's working capital as of the consummation of the MicroProbe Acquisition relative to an agreed-upon target and b) 3,020,944 shares of FormFactor's common stock valued at the closing market price of $4.57 per share on October 16, 2012, and the fair value of a settlement related to patent litigation between the two parties of $3.3 million. We recorded $77.6 million of identifiable intangible assets and $6.9 million of net tangible assets, net of $26.7 million of deferred income tax liabilities, based on their estimated fair values, and $30.0 million of goodwill.

The results of operations of the MicroProbe business and the estimated fair values of the assets acquired and liabilities assumed have been included in our consolidated financial statements since the date of the acquisition. For the six months ended June 29, 2013, the contribution of the acquired MicroProbe business to our total revenues was $42.6 million. The portion of total expenses and net income associated with the acquired MicroProbe business was not separately identifiable due to the integration with our operations.

Pro forma financial information

The following unaudited supplemental pro forma information presents the combined results of operations of FormFactor and MicroProbe for the six months ended June 29, 2013 and six months ended June 30, 2012, as if the MicroProbe Acquisition had been completed at the beginning of fiscal 2011. The pro forma financial information includes adjustments to reflect one-time charges and amortization of fair value adjustment in the appropriate pro forma periods as though the companies were combined as of the beginning of 2011. These adjustments include:


•	A net adjustment in amortization expense and add-back expenses were $1.5 million and $3.0 million for the three months ended June 29, 2013 and 2012, respectively and $3.0 million and $6.0 million for six month ended June 29, 2013 and June 30, 2012, related to the fair value of acquired identifiable intangible assets.


•	The exclusion of other non-recurring expenses of $0.5 million and $1.6 million for the three and six months ended June 29, 2013 were primarily related to the fair value step-up to acquired inventory and fixed assets.


•	Exclusion of $0.3 million and $1.2 million integration and acquisition costs incurred in the three and six months ended June 29, 2013, respectively.

The unaudited pro forma results do not assume any operating efficiencies as a result of the consolidation of operations (in thousands, except per share data):



	Three Months Ended						Six Months Ended
	June 29, 2013			June 30, 2012			June 29, 2013			June 30, 2012
Revenues	$	62,733		$	79,648		$	115,353		$	141,656
Net loss	(6,410		)	(4,679		)	(22,662		)	(21,250		)
Net loss per share - basic	$	(0.12	)	$	(0.09	)	$	(0.42	)	$	(0.40	)

- Definition

The entire disclosure for a business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities. The disclosure may include leverage buyout transactions (as applicable).

+ References

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-Name Emerging Issues Task Force (EITF)
-Number 88-16
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph F4
-Subparagraph e
-Appendix F

Reference 18: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141
-Paragraph 51, 52
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Reference 19: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
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+ Details

Concentration of Credit and Other Risks	6 Months Ended
Concentration of Credit and Other Risks	Jun. 29, 2013
Risks and Uncertainties [Abstract]
Concentration of Credit and Other Risks	Concentration of Credit and Other Risks Financial instruments that potentially subject us to concentrations of credit risk consist primarily of cash equivalents, marketable securities and trade receivables. Our cash equivalents and marketable securities are held in safekeeping by large, credit worthy financial institutions. We invest our excess cash primarily in U.S. banks, government and agency bonds, money market funds and corporate obligations. We have established guidelines relative to credit ratings, diversification and maturities that seek to maintain safety and liquidity. Deposits in these banks may exceed the amounts of insurance provided on such deposits. To date, we have not experienced any losses on our deposits of cash and cash equivalents. We market and sell our products to a narrow base of customers and generally do not require collateral. Two customers accounted for 20% and 15% of revenues during the three months ended June 29, 2013 and one customer accounted for 36% of revenues during the three months ended June 30, 2012. No other customers accounted for more than 10% of total revenues in either of these fiscal periods. Two customers accounted for 20% and 16% of revenues during the six months ended June 29, 2013 and two customers accounted for 36% and 12% of revenues during the six months ended June 30, 2012. At June 29, 2013, three customers accounted for 16%, 12% and 11% of gross accounts receivable. At December 29, 2012, one customer accounted for approximately 29% of gross accounts receivable. No other customers accounted for more than 10% of gross accounts receivable at either of these fiscal period ends. We operate in the intensely competitive semiconductor industry, including the Dynamic Random Access Memory, or DRAM, Flash memory, and system-on-chip, or SoC markets, which have been characterized by price erosion, rapid technological change, short product life-cyclical market patterns and heightened foreign and domestic competition. Significant technological changes in the industry could adversely affect our operating results. Certain components for our wafer probe card products that meet our requirements are available only from a limited number of suppliers. The rapid rate of technological change and the necessity of developing and manufacturing products with short life cycles may intensify our reliance on such suppliers. The inability to obtain components as required, or to develop alternative sources, if and as required in the future, could result in delays or reductions in product shipments, which in turn could have a material adverse effect on our business, financial condition, results of operations or cash flows.

- Definition

The entire disclosure for any concentrations existing at the date of the financial statements that make an entity vulnerable to a reasonably possible, near-term, severe impact. This disclosure informs financial statement users about the general nature of the risk associated with the concentration, and may indicate the percentage of concentration risk as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Position (SOP)
-Number 94-6
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
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+ Details

Intangible Assets and Goodwill

6 Months Ended

Jun. 29, 2013

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible Assets and Goodwill

The changes in the carrying amount of goodwill, which is not deductible for tax purposes for the three and the six months ended June 29, 2013, were as follows (in thousands):



Goodwill	Amount
Balance as of December 29, 2012	$	30,994
Working capital adjustments affecting the MicroProbe purchase price	684
Change in fair value of net intangible and tangible assets	(578		)
Balance as of March 30, 2013	31,100
Sale of subsidiary	(177		)
Change in value of net tangible assets	(965		)
Balance as of June 29, 2013	$	29,958

In the first fiscal quarter of 2013, we increased goodwill by $684 thousand in connection with the working capital adjustments pursuant to the acquisition agreement, and decreased goodwill by $578 thousand resulting from a number of revisions to preliminary fair value measurements of net tangible assets. In the second fiscal quarter of 2013, goodwill was decreased by $177 thousand in connection with the sale of a subsidiary of MicroProbe and by $965 thousand for further revisions to preliminary fair value measurements, principally resulting from the adjustment of a liability assumed in the acquisition resulting from a settlement.

The Company has not recorded any historical goodwill impairment as of June 29, 2013.

The Company determined the total consideration paid for its acquisition of MicroProbe as well as the fair value of the assets acquired and liabilities assumed as of the date of acquisition. The fair value of the assets acquired and liabilities assumed continue to be preliminary and may be adjusted as the Company obtains additional information, primarily related to adjustments for the true up of acquired net working capital in accordance with the purchase agreement, and estimated values of certain net tangible assets and liabilities including tax balances, pending the completion of final studies and subject to change to further adjustments as the Company continues to finalize the valuation of the net tangible and intangible assets as soon as practicable, but not later than one-year from the acquisition date.

The changes in intangible assets during the six months ended June 29, 2013 and the net book value of intangible assets as of December 29, 2012 were as follows (in thousands):



	Intangible Assets, Gross Amount							Accumulated Amortization						Intangible Assets, Net				Weighted Average Useful Life
Other Intangible Assets	December 29, 2012		Additions (Disposals)			June 29, 2013		December 29, 2012		Expense, net		June 29, 2013		December 29, 2012		June 29, 2013		June 29, 2013
Existing developed technologies	$	37,048	$	14,200		$	51,248	$	6,055	$	6,148	$	12,203	$	30,993	$	39,045	2.82
Trade name	4,500		(112		)	4,388		94		217		311		4,406		4,077		9.29
Customer relationships	17,000		—			17,000		445		1,068		1,513		16,555		15,487		7.29
Non-compete agreement	100		—			100		21		50		71		79		29		0.29
Backlog	3,500		—			3,500		2,594		906		3,500		906		—		—
Favorable lease asset	300		—			300		63		150		213		237		87		0.29
Total finite-lived intangible assets	62,448		14,088			76,536		9,272		8,539		17,811		53,176		58,725
In-process research and development	21,100		(14,200		)	6,900		—		—		—		21,100		6,900
Total intangible assets	$	83,548	$	(112	)	$	83,436	$	9,272	$	8,539	$	17,811	$	74,276	$	65,625

During the three months ended March 30, 2013, one of the purchased in-process research and development (IPR&D) projects from the MicroProbe Acquisition with a carrying value of $10.1 million was completed and reclassified as a finite-lived intangible asset, and is currently being amortized over its estimated useful life. During the three months ended June 29, 2013, a further purchased IPR&D project from the MicroProbe Acquisition with a carrying value of $4.1 million was completed and reclassified as a finite-lived intangible asset and is currently being amortized over its estimated useful life.

The remaining IPR&D assets are classified as indefinite lived intangible assets that are are not currently subject to amortization but are reviewed for impairment whenever events or changes in circumstances indicate that the carrying value of such assets may not be recoverable. The IPR&D assets will be subject to amortization upon completion of their respective research projects and at the start of commercialization. The fair values assigned to IPR&D assets were determined using the income approach based on estimates and judgments regarding risks inherent in the development process, including the likelihood of achieving technological success and market acceptance. If an IPR&D project is abandoned, the acquired technology attributable to the project will be expensed in the Consolidated Statement of Operations. .

For the three months ended June 29, 2013 amortization expense of $3.4 million and $0.8 million was included in the cost of revenues and selling, general and administrative expenses, respectively. For the six months ended June 29, 2013 amortization expense of $7.0 million and $1.5 million was charged to cost of revenues and selling, general and administrative expense, respectively. For the three and six months ended June 30, 2012, $0.3 million and $0.6 million of amortization expense was charged to cost of revenues, respectively.

Based on the carrying values of the finite-lived intangible assets recorded as of June 29, 2013 and assuming no subsequent additions to or impairment of the underlying assets, the remaining estimated annual amortization expense is expected to be as follows (in thousands):



Fiscal Year	Amount
2013	$	8,156
2014	18,780
2015	12,739
2016	8,720
2017	2,551
thereafter	7,779
Total	$	58,725

Restructuring Charges

6 Months Ended

Jun. 29, 2013

Restructuring and Related Activities [Abstract]

Restructuring Charges

Restructuring charges include costs related to employee termination benefits, cost of long-lived assets abandoned or impaired, as well as contract termination costs. Restructuring charges are reflected separately as "Restructuring charges, net" in the Condensed Consolidated Statements of Operations. A summary of the actions we have taken during the six months ended June 29, 2013 and June 30, 2012 are discussed below.

2013 Restructuring Activities

In the first fiscal quarter of 2013, we implemented a restructuring plan (the "Q1 2013 Restructuring Plan") which resulted in the reduction of our global workforce by 31 employees across the organization. In addition we reduced our temporary workforce by approximately 20 positions. We also suspended development activities and engineering efforts for our next generation DRAM Matrix platform and terminated development activities for a certain SoC product platform. We recorded $4.0 million of restructuring charges during the first fiscal quarter of 2013, which was comprised of $1.3 million in severance and related benefits, and recorded $2.7 million in impairment charges for certain equipment that would no longer be utilized. As a result of the Q1 2013 Restructuring Plan, we expect to realize quarterly savings, excluding stock-based compensation in the range of $2.0 million to $2.5 million in subsequent quarters.

In the second quarter of 2013, we recorded $0.1 million of severance and related benefits due to the reduction of 4 employees across the organization.

The liabilities we accrued represent our best estimate of the obligations we expect to incur and could be subject to adjustment as market conditions change. The remaining cash payments associated with our various reductions in workforce are expected to be paid by the end of the first fiscal quarter of 2014. As such, the restructuring accrual is recorded as a current liability within ‘Accrued liabilities’ in the Condensed Consolidated Balance Sheets.

2012 Restructuring Activities

There were no restructuring charges in the first quarter of 2012. In the second fiscal quarter of 2012, we recorded $0.1 million in charges for severance and related benefits to restructuring activities.

The activities in the restructuring accrual for the six months ended June 29, 2013 were as follows (in thousands):



	Employee Severance and Benefits			Property and Equipment Impairment			Contract Termination and Other Costs			Total
Accrual at December 29, 2012	$	548		$	—		$	68		$	616
Restructuring charges	1,468			2,743			14			4,225
Cash payments	(1,552		)	(32		)	(17		)	(1,601		)
Asset impairment				(2,743		)				(2,743		)
Adjustments to restructuring charges	(152		)	(5		)				(157		)
Other settlements	9			37			(65		)	(19		)
Accrual at June 29, 2013	$	321		$	—		$	—		$	321

- Definition

The entire disclosure for restructuring and related activities. Description of restructuring activities such as exit and disposal activities, include facts and circumstances leading to the plan, the expected plan completion date, the major types of costs associated with the plan activities, total expected costs, the accrual balance at the end of the period, and the periods over which the remaining accrual will be settled.

+ References + Details

Fair Value

6 Months Ended

Jun. 29, 2013

Fair Value Disclosures [Abstract]

Fair Value

We use fair value measurements to record fair value adjustments to certain financial and non-financial assets and to determine fair value disclosures. Our marketable securities are financial assets recorded at fair value on a recurring basis. Our goodwill, intangible assets and liabilities and a note receivable are measured at fair value on a non-recurring basis.

The accounting standard for fair value defines fair value, establishes a framework for measuring fair value and requires disclosures about fair value measurements. Fair value is defined as the price that would be received from selling an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. When determining the fair value measurements for assets and liabilities required to be recorded at fair value, we consider the principal or most advantageous market in which we would transact and consider assumptions that market participants would use when pricing the asset or liability, such as inherent risk, transfer restrictions and risk of nonperformance. The accounting standard establishes a fair value hierarchy that requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. A financial instrument’s categorization within the fair value hierarchy is based upon the lowest level of input that is significant to the fair value measurement. The standard describes a fair value hierarchy based on three levels of inputs, the first-two of which are considered observable and the last unobservable. We apply the following fair value hierarchy, which prioritizes the inputs used in measuring fair value as follows:

•Level 1 - Quoted prices in active markets for identical assets or liabilities.

•Level 2 - Inputs, other than the quoted prices in active markets, which are observable either directly or indirectly.


•	Level 3 - Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.

Assets Measured at Fair Value on a Recurring Basis

We measure and report certain assets and liabilities at fair value on a recurring basis, including money market funds, U.S. Treasury securities, agency securities and foreign currency derivatives (see Note 19—Derivative Financial Instruments for a discussion of fair value of foreign currency derivatives).

We utilize the market approach to measure the fair value of our fixed income securities. The market approach is a valuation technique that uses prices and other relevant information generated by market transactions involving identical or comparable assets or liabilities. The fair value of our fixed income securities is obtained using readily-available market prices from a variety of industry standard data providers, large financial institutions, and other third-party sources for the identical underlying securities.

We obtain the fair value of our Level 1 investments in certain money market funds at the expected market price. These investments are expected to maintain a net asset value of $1 per share.

We determine the fair value of our Level 2 financial instruments from several third-party asset managers, custodian banks and accounting service providers. Independently, these service providers use professional pricing services to gather pricing data, which may include quoted market prices for identical or comparable instruments or inputs other than quoted prices that are observable either directly or indirectly.

Fair value measured on a recurring basis as of June 29, 2013 (in thousands):



	Level 1		Level 2		Total
Assets:
Cash equivalents
Money market funds	$	25,837	$	—	$	25,837
Agency securities (Federal)
Commercial paper	—		5,996		5,996
U. S. Treasuries	—		52,529		52,529
Agency securities	—		38,837		38,837
Total	$	25,837	$	97,362	$	123,199

Fair value measured on a recurring basis as of December 29, 2012 (in thousands):



	Level 1		Level 2		Total
Assets:
Cash equivalents
Money market funds	$	54,732	$	—	$	54,732
Marketable securities
U. S. Treasuries	—		43,587		43,587
Agency securities	—		49,958		49,958
Total	$	54,732	$	93,545	$	148,277

The Level 1 assets consist of our money market fund deposits. The Level 2 assets consist of our available-for-sale investment portfolio, which are valued utilizing a market approach. Our investments are priced by pricing vendors who provided observable inputs for their pricing without applying significant judgments. Broker’s pricing is used mainly when a quoted price is not available, the investment is not priced by our pricing vendors or when a broker price is more reflective of fair values in the market in which the investment trades. Our broker-priced investments are labeled as Level 2 investments because fair values of these investments are based on similar assets without applying significant judgments. In addition, all of our investments have a sufficient level of trading volume to demonstrate that the fair values used are appropriate for these investments.

We did not have any transfers of assets measured at fair value on a recurring basis to or from Level 1 and Level 2 during each of the three and six months ended June 29, 2013 and June 30, 2012 and we hold no Level 3 investments.

Assets Measured at Fair Value on a Non-Recurring Basis

We measure and report goodwill and intangible assets and liabilities at fair value on a non-recurring basis. See Note 5-Intangible Assets and Goodwill, for further details.

As of June 29, 2013, our financial asset that was recorded at fair value on a non-recurring basis comprised of a note receivable from The MicroManipulator Company (TMMC) , a wholly owned subsidiary of MicroProbe based in Carson City, Nevada. TMMC manufactures manual, analytical probe stations and accessories. As of June 29, 2013, TMMC's assets were sold to its management team for a purchase consideration of $1.0 million, of which $180 thousand was received in cash and $820 thousand in the form of a note receivable to be repaid over 7 years at a 5% interest rate. We classified this note receivable at a Level 3 category in the fair value hierarchy and determined its fair value utilizing the income method by applying a weighted average cost of capital discount rate to arrive at the net present value of the note receivable of approximately $470 thousand.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

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-Topic 825
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 15B
-Subparagraph a, b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
-Number 159
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-Paragraph 15A
-Subparagraph a-d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 15C, 15D
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 157
-Paragraph 32, 33, 34
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 3, 10, 14, 15
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Marketable Securities

6 Months Ended

Jun. 29, 2013

Investments, Debt and Equity Securities [Abstract]

Marketable Securities

We classify our marketable securities as available-for-sale. All marketable securities represent the investment of funds available for current operations, notwithstanding their contractual maturities. Such marketable securities are recorded at fair value and unrealized gains and losses are recorded in accumulated other comprehensive income until realized.

Marketable securities at June 29, 2013 consisted of the following (in thousands):



	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
U. S. Treasuries	$	52,495	$	51	$	(17	)	$	52,529
Commercial paper	5,996							5,996
Agency securities (Federal)	38,833		16		(12		)	38,837
	$	97,324	$	67	$	(29	)	$	97,362

Marketable securities at December 29, 2012 consisted of the following (in thousands):



	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
U. S. Treasuries	$	43,490	$	97	$	—		$	43,587
Agency securities (Federal)	49,896		63		(1		)	49,958
	$	93,386	$	160	$	(1	)	$	93,545

The marketable securities with gross unrealized losses have been in a loss position for less than twelve months as of June 29, 2013 and December 29, 2012, respectively.

When evaluating the investments for other-than-temporary impairment, we review factors such as the length of time and extent to which fair value has been below the amortized cost basis, review of current market liquidity, interest rate risk, the financial condition of the issuer, as well as credit rating downgrades. We believe that the unrealized losses are not other-than-temporary. We do not have a foreseeable need to liquidate the portfolio and anticipate recovering the full cost of the securities either as market conditions improve or as the securities mature.

Contractual maturities of marketable securities as of June 29, 2013 were as follows (in thousands):



	Amortized Cost		Fair Value
Due in one year or less	$	75,333	$	75,374
Due after one year to five years	21,991		21,988
	$	97,324	$	97,362

Realized gains and losses on sales and maturities of marketable securities were immaterial for the six months ended June 29, 2013 and June 30, 2012, respectively.

Allowance for Doubtful Accounts

6 Months Ended

Jun. 29, 2013

Receivables [Abstract]

Allowance for Doubtful Accounts

A majority of our trade receivables are derived from sales to large multinational semiconductor manufacturers throughout the world. In order to monitor potential credit losses, we perform ongoing evaluations of our customers' financial condition. An allowance for doubtful accounts is maintained based upon our assessment of the expected collectability of all accounts receivable. The allowance for doubtful accounts is reviewed and assessed for adequacy on a quarterly basis. We take into consideration (1) any circumstances of which we are aware of a customer's inability to meet its financial obligations and (2) our judgments as to prevailing economic conditions in the industry and their impact on our customers. If circumstances change, and the financial condition of our customers is adversely affected and they are unable to meet their financial obligations to us, we may need to take additional allowances, which would result in an increase in our operating expense.

During the six months ended June 29, 2013, we did not record any additional provision for doubtful accounts. During the six months ended June 30, 2012 we recorded an additional provision for doubtful accounts in the amount of $30 thousand related to a receivable from a customer that petitioned for bankruptcy. During the six months ended June 29, 2013, we released a total of $19 thousand of previously reserved bad debts and wrote off $94 thousand of uncollectable accounts receivable.

A reconciliation of the changes in our allowance for doubtful accounts receivable for the six months ended June 29, 2013 and June 30, 2012 is as follows (in thousands):



	June 29, 2013			June 30, 2012
Balance at beginning of period	$	290		$	238
Additions	—			30
Reductions	(19		)	—
Balance at end of period	$	271		$	268

- Definition

The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5066-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.3,4)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 235
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(k))
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-Name Accounting Standards Codification
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-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5074-111524

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Statement of Position (SOP)
-Number 01-6
-Paragraph 13
-Subparagraph d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 3, 4
-Article 5

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 7
-Article 9

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph k
-Article 4

+ Details

Inventories

6 Months Ended

Jun. 29, 2013

Inventory Disclosure [Abstract]

Inventories

Inventories consisted of the following (in thousands):



	June 29, 2013		December 29, 2012
Raw materials	$	8,038	$	8,702
Work-in-progress	15,168		11,181
Finished goods	2,924		3,733
	$	26,130	$	23,616

Inventories are stated at the lower of cost (principally standard cost which approximates actual cost on a first-in, first-out basis) or market value. The provision for potentially excess and obsolete inventory is made based on management's analysis of inventory levels and forecasted future sales. Once the value is adjusted, the original cost of our inventory less the related inventory write-down represents the new cost basis of such products. Reversal of these write downs is recognized only when the related inventory has been scrapped or sold. Shipping and handling costs are classified as a component of "Cost of revenues" in the Condensed Consolidated Statements of Operations.

We reclassified inventory reserves between work-in-process and finished goods as of December 31, 2012 to conform to current year presentation.

Warranty

6 Months Ended

Jun. 29, 2013

Product Warranties Disclosures [Abstract]

Warranty

We offer warranties on certain products and record a liability for the estimated future costs associated with warranty claims, which is based upon historical experience and our estimate of the level of future costs. We provide for the estimated cost of product warranties at the time revenue is recognized. Warranty costs are reflected in the Condensed Consolidated Statement of Operations as a cost of revenues.

A reconciliation of the changes in our warranty liability for the six months ended June 29, 2013 and June 30, 2012 is as follows (in thousands):



	June 29, 2013			June 30, 2012
Balance at beginning of period	$	734		$	330
Accruals	109			497
Settlements	(532		)	(383		)
Balance at the end of period	$	311		$	444

Long-lived Assets

6 Months Ended

Jun. 29, 2013

Long-Lived Assets Disclosure [Abstract]

Long-lived Assets

Impairment of Long-lived Assets

During the three and six months ended June 29, 2013, we recorded $0.1 million and $0.2 million related to manufacturing assets we no longer utilize. During the three and six months ended June 30, 2012, we recorded an impairment of $0.1 million and $0.2 million related to certain assets which were previously held for sale that were subsequently determined to no longer have any sales value or use in future operations. These charges are included in Impairments of long-lived assets in the Condensed Consolidated Statements of Operations in their respective periods.

Long-lived Assets

Property, plant and equipment consisted of the following (in thousands):



	June 29, 2013			December 29, 2012
Building	$	790		$	790
Machinery and equipment	149,736			140,320
Computer equipment and software	38,050			38,092
Capital leases	2,525			2,367
Furniture and fixtures	5,990			6,249
Leasehold improvements	69,992			71,418
Sub total	267,083			259,236
Less: accumulated depreciation and amortization	(231,571		)	(227,126		)
Net long-lived assets	35,512			32,110
Construction-in-progress	4,118			13,405
Total	$	39,630		$	45,515

Accumulated Other Comprehensive Income

6 Months Ended

Jun. 29, 2013

Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]

Accumulated Other Comprehensive Income

Accumulated other comprehensive income includes foreign currency translation adjustments and unrealized gains (losses) on available-for-sale securities. Components of accumulated other comprehensive income were as follows (in thousands):



	June 29, 2013			December 29, 2012
Unrealized loss on marketable securities, net of tax of $428 at June 29, 2013 and December 29, 2012, respectively	$	(390	)	$	(270	)
Cumulative translation adjustments	418			1,985
Accumulated other comprehensive income	$	28		$	1,715

- Definition

The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e689-108580

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Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Reclassification Adjustments
-URI http://asc.fasb.org/extlink&oid=6522872

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
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-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e681-108580

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 14-26
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Stockholders' Equity

6 Months Ended

Jun. 29, 2013

Stockholders' Equity Note [Abstract]

Stockholders' Equity

Stockholders’ Equity

The Company grants options to purchase, at future dates, shares of its common stock to employees and consultants. The exercise price of each stock option equals the fair market value of FormFactor common stock on the date of grant. Options typically vest over three to four years, subject to the grantee's continued service with the Company through the scheduled vesting date, and expire five to ten years from the grant date. The fair value of each option grant is estimated on the date of the grant using the Black-Scholes option pricing model.

Stock Options

Stock option activity under our equity incentive plans during the six months ended June 29, 2013 is set forth below:



	Number of Options		Weighted Average Exercise Price		Weighted Average Remaining Contractual Life in Years	Aggregate Intrinsic Value
Outstanding at December 29, 2012	4,208,847		$	13.11	3.69	$	—
Options granted	—		—		0.00	—
Options exercised	(20,000	)	5.28		0.00	—
Options canceled	(456,179	)	15.84		0.00	—
Outstanding at June 29, 2013	3,732,668		$	12.82	3.21	$	32,250
Vested and expected to vest at June 29, 2013	3,706,544		$	12.85	3.20	$	28,772
Exercisable at June 29, 2013	3,125,370		$	13.51	3.01	$	—

No stock options were granted for the six months ended June 29, 2013 and there were 20 thousand stock options exercised during the same period. The intrinsic value of option exercises during the six months ended June 29, 2013 was $10 thousand. Cash received from stock option exercises during the six months ended June 29, 2013 was $106 thousand.

Restricted Stock Units

Restricted stock unit activity under our equity incentive plans during the six months ended June 29, 2013 is set forth below:



	Units		Weighted Average Grant Date Fair Value
Restricted stock units at December 29, 2012	2,228,946		$	7.66
Awards granted	1,624,000		5.01
Awards vested	(644,407	)	8.79
Awards canceled	(176,062	)	9.04
Restricted stock units at June 29, 2013	3,032,477		$	5.92

On May 6, 2013, we issued 355,000 shares of restricted stock units to seven senior executives and one non-executive of our company that will vest based on certain market performance criteria. The performance criteria are based on the Company's Total Shareholder Return (TSR) for the period from April 1, 2013 to March 31, 2015 relative to the TSR of the companies identified as being part of the S&P Semiconductor Select Industry Index (FormFactor peer companies), as of April 1, 2013. The compensation cost will be recognized ratably over the requisite service period. As of June 29, 2013, we recorded $0.1 million of stock-based compensation expense related to these awards.

The total fair value of restricted stock units vested during the three and six months ended June 29, 2013 was $3.5 million and $5.7 million, respectively. The total fair value of restricted stock units vested during the three and six months ended June 30, 2012 was $2.3 million and $2.7 million, respectively.

Employee Stock Purchase Plan

Under the 2012 Employee Stock Purchase Plan, the offering periods are 12 months commencing on February 1 of each calendar year and ending on January 31 of the subsequent calendar year, and a six month fixed offering period commencing on August 1 of each calendar year and ending on January 31 of the subsequent calendar year. The 12 month offering period consists of two six month purchase periods and the six month offering period consists of one six month purchase period. The price of the common stock purchased is 85% of the lesser of the fair market value of the common stock on the first day of the applicable offering period or the last day of each purchase period.

- Definition

The entire disclosure for shareholders' equity, comprised of portions attributable to the parent entity and noncontrolling interest, if any, including other comprehensive income (as applicable). Including, but not limited to: (1) balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings; (2) accumulated balance for each classification of other comprehensive income and total amount of comprehensive income; (3) amount and nature of changes in separate accounts, including the number of shares authorized and outstanding, number of shares issued upon exercise and conversion, and for other comprehensive income, the adjustments for reclassifications to net income; (4) rights and privileges of each class of stock authorized; (5) basis of treasury stock, if other than cost, and amounts paid and accounting treatment for treasury stock purchased significantly in excess of market; (6) dividends paid or payable per share and in the aggregate for each class of stock for each period presented; (7) dividend restrictions and accumulated preferred dividends in arrears (in aggregate and per share amount); (8) retained earnings appropriations or restrictions, such as dividend restrictions; (9) impact of change in accounting principle, initial adoption of new accounting principle and correction of an error in previously issued financial statements; (10) shares held in trust for Employee Stock Ownership Plan (ESOP); (11) deferred compensation related to issuance of capital stock; (12) note received for issuance of stock; (13) unamortized discount on shares; (14) description, terms, and number of warrants or rights outstanding; (15) shares under subscription and subscription receivables, effective date of new retained earnings after quasi-reorganization and deficit eliminated by quasi-reorganization and, for a period of at least ten years after the effective date, the point in time from which the new retained dates; and (16) retroactive effective of subsequent change in capital structure.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(d),(e))
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-Publisher FASB
-Name Accounting Standards Codification
-Glossary Preferred Stock
-URI http://asc.fasb.org/extlink&oid=6521494

Reference 12: http://www.xbrl.org/2003/role/presentationRef
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-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 43
-Section B
-Paragraph 7, 11A
-Chapter 1
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 15: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Principles Board Opinion (APB)
-Number 12
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 16: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 5
-Paragraph 15
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Reference 17: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph d
-Article 4

Reference 18: http://www.xbrl.org/2003/role/presentationRef
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-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30, 31
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Reference 19: http://www.xbrl.org/2003/role/presentationRef
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-Name Staff Accounting Bulletin (SAB)
-Number Topic 4
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Reference 20: http://www.xbrl.org/2003/role/presentationRef
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-Name Regulation S-X (SX)
-Number 210
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Reference 21: http://www.xbrl.org/2003/role/presentationRef
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 23: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

+ Details

Stock-Based Compensation

6 Months Ended

Jun. 29, 2013

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock-Based Compensation

We account for all stock-based compensation to employees and directors, including grants of stock options, as stock-based compensation costs based on the fair value measured as of the date of grant. These costs are recognized as an expense in the Condensed Consolidated Statements of Operations over the requisite service period.

The table below shows stock-based compensation charges included in the Condensed Consolidated Statements of Operations (in thousands):



	Three Months Ended				Six Months Ended
	June 29, 2013		June 30, 2012		June 29, 2013		June 30, 2012
Stock-based compensation included in:
Cost of revenues	$	638	$	716	$	1,162	$	1,229
Research and development	841		1,249		1,842		2,298
Selling, general and administrative	1,653		1,513		3,163		2,994
Total stock-based compensation	3,132		3,478		6,167		6,521
Tax effect on stock-based compensation	—		—		—		—
Total stock-based compensation, net of tax	$	3,132	$	3,478	$	6,167	$	6,521

Stock Options

During the three and six months ended June 29, 2013, we did not grant any stock options. During the three months ended June 30, 2012, we did not grant any stock options. During the six months ended June 30, 2012 we granted 45 thousand stock options under the 2002 Plan with a weighted average grant-date fair value of $1.84 per share. The following weighted-average assumptions were used in the estimated grant-date fair value calculations for stock options:



	Three Months Ended				Six Months Ended
	June 29, 2013		June 30, 2012		June 29, 2013		June 30, 2012
Stock Options:
Dividend yield	—	%	—	%	—	%	—	%
Expected volatility	—	%	—	%	—	%	47.7	%
Risk-free interest rate	—	%	—	%	—	%	0.46	%
Expected term (in years)	0		0		0		3.49

Employee Stock Purchase Plan

During the three months ended June 29, 2013 and June 30, 2012, there were no shares issued. During the six months ended June 29, 2013 and June 30, 2012, we issued 286,928 and 293,161 shares, respectively. The following weighted-average assumptions were used in estimating the fair value of employees' purchase rights under our approved employee stock purchase plans:



	Three Months Ended				Six Months Ended
	June 29, 2013		June 30, 2012		June 29, 2013		June 30, 2012
ESPP:
Dividend yield	—	%	—	%	—	%	—	%
Expected volatility	38.4	%	47.0	%	40.7	%	47.6	%
Risk-free interest rate	0.11	%	0.09	%	0.15	%	0.12	%
Expected term (in years)	0.5		0.5		0.6		0.5

Unrecognized Compensation Costs

At June 29, 2013, the unrecognized stock-based compensation, adjusted for estimated forfeitures, was as follows (in thousands):



	Unrecognized Expense		Average Expected Recognition Period in Years
Stock options	$	1,472	1.00
Restricted stock units	10,644		1.76
Employee Stock Purchase Plan	62		0.09
Total unrecognized stock-based compensation expense	$	12,178

- Definition

The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 50
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6406099&loc=d3e25284-112666

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 40
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph 64, 65, A240
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Statement of Position (SOP)
-Number 93-6
-Paragraph 53
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Net Loss per Share

6 Months Ended

Jun. 29, 2013

Earnings Per Share [Abstract]

Net Loss per Share

Basic net loss per share is computed by dividing net loss by the weighted-average number of common shares outstanding for the period. Diluted loss per share for the three and six months ended June 29, 2013 and June 30, 2012, respectively, was based only on the weighted-average number of shares outstanding during that period as the inclusion of any common stock equivalents would have been anti-dilutive.

A reconciliation of the numerator and denominator used in the calculation of basic and diluted net loss per share is as follows (in thousands):



	Three Months Ended						Six Months Ended
	June 29, 2013			June 30, 2012			June 29, 2013			June 30, 2012
Numerator:
Net loss used in computing basic and diluted net loss per share	$	(8,407	)	$	(4,217	)	$	(28,180	)	$	(21,671	)
Denominator:
Weighted-average shares used in computing basic net loss per share	54,105			49,817			53,886			49,652
Add potentially dilutive securities	—			—			—			—
Weighted average shares used in computing basic and diluted net loss per share	54,105			49,817			53,886			49,652

The following table sets forth the weighted-average number of all potentially dilutive securities excluded from the computation in the table above because their effect would have been anti-dilutive (in thousands):



	Three Months Ended		Six Months Ended
	June 29, 2013	June 30, 2012	June 29, 2013	June 30, 2012
Options to purchase common stock	3,970	4,464	4,075	4,538
Restricted stock units	523	1,304	622	1,258
Employee stock purchase plan	31	32	18	10
Total potentially dilutive securities	4,524	5,800	4,715	5,806

Income Taxes	6 Months Ended
Income Taxes	Jun. 29, 2013
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes We recorded an income tax provision of $0.2 million for international subsidiaries for the three months ended June 29, 2013 and benefit of $5 thousand, for the six months ended June 29, 2013 as compared to an income tax benefit of $1.6 million and $1.4 million, respectively for the three and six months ended June 30, 2012. The income tax benefit for the six months ended June 29, 2013, primarily relates to reinstatement of the Federal R&D tax credit which was retroactively applied to 2012. The income tax benefits for the three and six months ended June 30, 2012 reflect a $1.6 million release of reserve for uncertain tax positions related to the lapsing of statutes of limitations in our U.S. jurisdiction, offset by income tax expense in our non-U.S. jurisdictions. We continue to maintain a valuation allowance for our U.S. Federal and state deferred tax assets. The liability for uncertain tax positions is classified as a long-term income tax liability as payments are not anticipated over the next 12 months. It may be reduced when liabilities are settled with taxing authorities or when the statute of limitations expire without assessment from tax authorities. We are unable to make a reasonable estimate as to when cash settlements with the relevant taxing authorities will occur. Unrecognized tax benefits remained flat at $17.2 million for the six months ended June 29, 2013. If recognized, $2.5 million of these unrecognized tax benefits (net of Federal tax benefit) would be recorded as a reduction of future income tax provision before consideration of changes in valuation allowance. We classify interest and penalties related to uncertain tax positions as part of the income tax provision. For the three months ended June 29, 2013 and June 30, 2012, we recognized an interest benefit, net of penalties, of approximately $3 thousand and $0.4 million, respectively. As of the six months as of June 29, 2013 and June, 30, 2012, we have accrued total interest and penalties of $0.2 million and a benefit, net of penalties, of $0.4 million related to the uncertain tax positions, respectively. The amount of income taxes we pay is subject to ongoing audits by Federal, state and non-U.S. tax authorities which might result in proposed assessments. Our estimate for the potential outcome for any uncertain tax issue is judgmental in nature. A number of years may elapse before an uncertain tax position is audited and finally resolved. While it is often difficult to predict the final outcome or the timing of resolution of any particular uncertain tax position, we believe that our reserves for income taxes reflect the most likely outcome. We adjust these reserves, as well as the related interest, in light of changing facts and circumstances. However, if an ultimate tax assessment exceeds our estimate of tax liabilities, additional tax expense will be recorded. The impact of such adjustments could have a material impact on our results of operations in future periods.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References

+ Details

Commitments and Contingencies	6 Months Ended
Commitments and Contingencies	Jun. 29, 2013
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Contractual and purchase obligations We lease facilities under non-cancellable operating leases with various expiration dates through 2021. The facilities generally require us to pay property taxes, insurance and maintenance costs. Further, several lease agreements contain rent escalation clauses or rent holidays. For purposes of recognizing minimum rental expenses on a straight-line basis over the terms of the leases, we use the date of initial possession to begin amortization. We have the option to extend or renew most of our leases, which may increase the future minimum lease commitments. Other purchase obligations are primarily for purchases of inventory and manufacturing related service contracts. Other purchase obligations are defined as agreements that are enforceable and legally binding and that specify all significant terms, including: fixed or minimum quantities to be purchased; fixed, minimum or variable price provisions; and the approximate timing of the transaction. Timing of payments and actual amounts paid may be different depending on the time of receipt of goods or services or changes to agreed-upon amounts for some obligations. Our lease and purchase obligations have not materially changed during the six months ended June 29, 2013 from those disclosed in our Annual Report on Form 10K for the fiscal year ended December 29, 2012. Environmental Matters We are subject to U.S. federal, state and local, and foreign governmental laws and regulations relating to the protection of the environment, including those governing the discharge of pollutants into the air and water, the management and disposal of hazardous substances and wastes, the clean-up of contaminated sites and the maintenance of a safe workplace. We believe that we comply in all material respects with the environmental laws and regulations that apply to us, including those of the California Department of Toxic Substances Control, the Bay Area Air Quality Management District, the City of Livermore Water Resources Division, County of Santa Clara Department of Environmental Health, County of San Diego Hazardous Materials Division and Encino Water District, and the California Division of Occupational Safety and Health. We did not receive any notices of violations of environmental laws and regulations in fiscal 2012 or 2011. In fiscal 2010 we did receive one notice of violation from the City of Livermore regarding a violation of certain applicable waste water discharge limits. For the notice received, we promptly investigated the violation, took what we believed to be appropriate steps to address the cause of the violation, and implemented corrective measures to prevent a recurrence. We did not receive any notices of violations of environmental laws and regulations during the first-six months of our fiscal 2013. No provision has been made for loss from environmental remediation liabilities associated with our facilities because we believe that it is not probable that a liability has been incurred as of June 29, 2013. While we believe that we are in compliance in all material respects with the environmental laws and regulations that apply to us, in the future, we may receive additional environmental violation notices, and if received, final resolution of the violations identified by these notices could harm our operations, which may adversely impact our operating results and cash flows. New laws and regulations, stricter enforcement of existing laws and regulations, the discovery of previously unknown contamination at our or others' sites or the imposition of new cleanup requirements could also harm our operations, thereby adversely impacting our operating results and cash flows. Indemnification Arrangements We have entered, and may from time to time in the ordinary course of our business enter, into contractual arrangements with third parties that include indemnification obligations. Under these contractual arrangements, we have agreed to defend, indemnify and/or hold the third party harmless from and against certain liabilities. These arrangements include indemnities in favor of customers in the event that our wafer probe cards infringe a third party's intellectual property and indemnities in favor of our lessors in connection with facility leasehold liabilities that we may cause. In addition, we have entered into indemnification agreements with our directors and certain of our officers, and our bylaws contain indemnification obligations in favor of our directors, officers and agents. These indemnity arrangements may limit the type of the claim, the total amount that we can be required to be paid in connection with the indemnification obligation and the time within which an indemnification claim can be made. The duration of the indemnification obligation may vary, and for most arrangements, survives the agreement term and is indefinite. We believe that substantially all of our indemnity arrangements provide either for limitations on the maximum potential future payments we could be obligated to make, or for limitations on the types of claims and damages we could be obligated to indemnify, or both. However, it is not possible to determine or reasonably estimate the maximum potential amount of future payments under these indemnification obligations due to the varying terms of such obligations, a lack of history of prior indemnification claims, the unique facts and circumstances involved in each particular contractual arrangement and in each potential future claim for indemnification, and the contingency of any potential liabilities upon the occurrence of events that are not reasonably determinable. We have not had any material requests for indemnification under these arrangements. Our management believes that any liability for these indemnity arrangements would not be material to our accompanying consolidated financial statements. We have not recorded any liabilities for these indemnification arrangements in our consolidated balance sheet as of June 29, 2013. Legal Matters From time to time, we may be subject to legal proceedings and claims in the ordinary course of business. For the six months ended June 29, 2013, we were not involved in any material legal proceedings. In the future we may become a party to additional legal proceedings that may require us to spend significant resources, including proceedings designed to protect our intellectual property rights. Customs and Trade Matters From time to time, we receive communications from certain jurisdictions regarding customs and indirect tax matters such as customs duties and value added taxes. For the fiscal quarter ending June 29, 2013, we did not receive any communications from jurisdictions regarding any material customs duties or indirect tax matters. Intellectual Property Litigation In the ordinary course of business, the Company has been, is currently, and may in the future be, involved in commercial litigation relating to intellectual property. No provision has been made for intellectual property litigation because we believe that it is not probable that a liability had been incurred as of June 29, 2013.

- Definition

The entire disclosure for commitments and contingencies.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 20
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
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-Subparagraph (SX 210.5-02.25)
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25287-109308

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Interpretation (FIN)
-Number 14
-Paragraph 3
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 5
-Paragraph 9, 10, 11, 12
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Derivative Financial Instruments

6 Months Ended

Jun. 29, 2013

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Financial Instruments

We operate and sell our products in various global markets. As a result, we are exposed to changes in foreign currency exchange rates. We utilize foreign currency forward contracts to hedge against future movements in foreign exchange rates that affect certain existing foreign currency denominated assets and liabilities. Under this program, our strategy is to have increases or decreases in our foreign currency exposures offset by gains or losses on the foreign currency forward contracts to mitigate the risks and volatility associated with foreign currency transaction gains or losses. We do not use derivative financial instruments for speculative or trading purposes. Our derivative instruments are not designated as hedging instruments. We record the fair value of these contracts as of the end of our reporting period to our Condensed Consolidated Balance Sheet with changes in fair value recorded within “Other income, net” in our Condensed Consolidated Statement of Operations for both realized and unrealized gains and losses.

The following table provides information about our foreign currency forward contracts outstanding as of June 29, 2013 (in thousands):



Currency	Contract Position	Contract Amount (Local Currency)		Contract Amount (U.S. Dollars)
Japanese Yen	Sell	15,358		$	154
Taiwan Dollar	Buy	(10,165	)	(341		)
Korean Won	Buy	(186,432	)	(163		)
Total USD notional amount of outstanding foreign exchange contracts				$	(350	)

The contracts were entered into on June 28, 2013 and mature on July 26, 2013. Our foreign currency contracts are classified within Level 2 of the fair value hierarchy as they are valued using pricing models that utilize observable market inputs. There was no change in the value of these contracts as of June 29, 2013. Additionally, no gains or losses relating to the outstanding derivative contracts were recorded in the three and six months ended June 29, 2013.

The location and amount of gains and losses related to non-designated derivative instruments that matured in the three and six months ended June 29, 2013 and June 30, 2012 in the Condensed Consolidated Statement of Operations are as follows (in thousands):



		Amount of Gain Recognized on Derivatives
		Three Months Ended						Six Months Ended
Derivatives Not Designated as Hedging Instruments	Location of Gain or (Loss) Recognized on Derivatives	June 29, 2013			June 30, 2012				June 29, 2013			June 30, 2012
Foreign exchange forward contracts	Other income, net	$	(23	)	$	(360	)		$	(251	)	$	1

- Definition

The entire disclosure for the entity's entire derivative instruments and hedging activities. Describes an entity's risk management strategies, derivatives in hedging activities and non-hedging derivative instruments, the assets, obligations, liabilities, revenues and expenses arising therefrom, and the amounts of and methodologies and assumptions used in determining the amounts of such items.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 45
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Reference 22: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Basis of Presentation and Summary of Significant Accounting Policies Basis of Presentation and Summary of Significant Accounting Policies (Policies)

6 Months Ended

Jun. 29, 2013

Organization, Consolidation and Summary of Significant Accounting Policies [Abstract]

Fiscal Period, Policy

Fiscal year. We operate on a 52/53 week fiscal year, whereby the fiscal year ends on the last Saturday of December. Fiscal 2013 will end on December 28, 2013, and will consist of 52 weeks.

New Accounting Pronouncements, Policy

Comprehensive Income

In February 2013, the FASB issued revised guidance on “Comprehensive Income: Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income.” The revised guidance does not change the current requirements for reporting net income or other comprehensive income in financial statements. However, the revised guidance requires an entity to provide information about the amounts reclassified out of accumulated other comprehensive income by component. In addition, an entity is required to present, either on the face of the statement where net income is presented or in the notes, significant amounts reclassified out of accumulated other comprehensive income by the respective line items of net income but only if the amount reclassified is required under GAAP to be reclassified to net income in its entirety in the same reporting period. For other amounts that are not required under GAAP to be reclassified in their entirety to net income, an entity is required to cross-reference to other disclosures required under GAAP that provide additional detail about those amounts. The revised guidance was adopted by the Company for its fiscal year 2013 commencing on December 30, 2012 and did not have a material effect on the Company's financial position, results of operations or liquidity.

Fair Value Measurement, Policy

•Level 1 - Quoted prices in active markets for identical assets or liabilities.

•Level 2 - Inputs, other than the quoted prices in active markets, which are observable either directly or indirectly.


•	Level 3 - Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.

Assets Measured at Fair Value on a Recurring Basis

We obtain the fair value of our Level 1 investments in certain money market funds at the expected market price. These investments are expected to maintain a net asset value of $1 per share.

Allowance for Doubtful Accounts

In order to monitor potential credit losses, we perform ongoing evaluations of our customers' financial condition. An allowance for doubtful accounts is maintained based upon our assessment of the expected collectability of all accounts receivable. The allowance for doubtful accounts is reviewed and assessed for adequacy on a quarterly basis. We take into consideration (1) any circumstances of which we are aware of a customer's inability to meet its financial obligations and (2) our judgments as to prevailing economic conditions in the industry and their impact on our customers. If circumstances change, and the financial condition of our customers is adversely affected and they are unable to meet their financial obligations to us, we may need to take additional allowances, which would result in an increase in our operating expense.

Inventories

- Definition

Disclosure of accounting policy for determining an entity's fiscal year or other fiscal period. This disclosure may include identification of the fiscal period end-date, the length of the fiscal period, any reporting period lag between the entity and its subsidiaries, or equity investees. If a reporting lag exists, the closing date of the entity having a different period end is generally noted, along with an explanation of the necessity for using different closing dates. Any intervening events that materially affect the entity's financial position or results of operations are generally also disclosed.

+ References + Details

- Definition

Disclosure of accounting policy for major classes of inventories, bases of stating inventories (for example, lower of cost or market), methods by which amounts are added and removed from inventory classes (for example, FIFO, LIFO, or average cost), loss recognition on impairment of inventories, and situations in which inventories are stated above cost. If inventory is carried at cost, this disclosure includes the nature of the cost elements included in inventory.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.6(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 330
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6386783&loc=d3e4492-108314

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 330
-SubTopic 10
-URI http://asc.fasb.org/subtopic&trid=2126999

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18780-107790

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 330
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6386783&loc=d3e4556-108314

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6361739&loc=d3e7789-107766

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Statement of Position (SOP)
-Number 81-1
-Paragraph 69-75
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 43
-Paragraph 3, 5-10, 15, 16, 17
-Chapter 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Financial Reporting Release (FRR)
-Number 206
-Paragraph b
-Subparagraph i, ii
-Chapter 2

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 43
-Section A
-Paragraph 9
-Chapter 3
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 6
-Subparagraph a
-Article 5

+ Details

- Definition

Disclosure of accounting policy for trade and other accounts receivables. This disclosure may include the basis at which such receivables are carried in the entity's statements of financial position (for example, net realizable value), how the entity determines the level of its allowance for doubtful accounts, when impairments, charge-offs or recoveries are recognized, and the entity's income recognition policies for such receivables, including its treatment of related fees and costs, its treatment of premiums, discounts or unearned income, when accrual of interest is discontinued, how the entity records payments received on nonaccrual receivables and its policy for resuming accrual of interest on such receivables. If the enterprise holds a large number of similar loans, disclosure may include the accounting policy for the anticipation of prepayments and significant assumptions underlying prepayment estimates for amortization of premiums, discounts, and nonrefundable fees and costs.

+ References + Details

Acquisition (Tables)

6 Months Ended

Jun. 29, 2013

Business Combinations [Abstract]

Schedule of Recognized Identified Assets Acquired and Liabilities Assumed

made adjustments to the acquisition price related to working capital adjustments pursuant to the relevant acquisition agreement together with adjustments to preliminary measurements of net tangible assets. In the second fiscal quarter of 2013, we made further adjustments to preliminary measurements of fair values of net tangible assets, resulting in the revised values noted below (in thousands):



	Original Values			Revised Values
Tangible net assets	$	31,842		$	33,562
Intangible assets	77,600			77,600
Deferred income tax liabilities	(26,663		)	(26,663		)
Goodwill	30,994			29,958
Total acquisition price	$	113,773		$	114,457

Business Acquisition, Pro Forma Information

The unaudited pro forma results do not assume any operating efficiencies as a result of the consolidation of operations (in thousands, except per share data):



	Three Months Ended						Six Months Ended
	June 29, 2013			June 30, 2012			June 29, 2013			June 30, 2012
Revenues	$	62,733		$	79,648		$	115,353		$	141,656
Net loss	(6,410		)	(4,679		)	(22,662		)	(21,250		)
Net loss per share - basic	$	(0.12	)	$	(0.09	)	$	(0.42	)	$	(0.40	)

- Definition

Tabular disclosure of pro forma results of operations for a material business acquisition or series of individually immaterial business acquisitions that are material in the aggregate.

+ References + Details

Intangible Assets and Goodwill (Tables)

6 Months Ended

Jun. 29, 2013

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

The changes in the carrying amount of goodwill, which is not deductible for tax purposes for the three and the six months ended June 29, 2013, were as follows (in thousands):



Goodwill	Amount
Balance as of December 29, 2012	$	30,994
Working capital adjustments affecting the MicroProbe purchase price	684
Change in fair value of net intangible and tangible assets	(578		)
Balance as of March 30, 2013	31,100
Sale of subsidiary	(177		)
Change in value of net tangible assets	(965		)
Balance as of June 29, 2013	$	29,958

Schedule of Finite-Lived Intangible Assets

The changes in intangible assets during the six months ended June 29, 2013 and the net book value of intangible assets as of December 29, 2012 were as follows (in thousands):



	Intangible Assets, Gross Amount							Accumulated Amortization						Intangible Assets, Net				Weighted Average Useful Life
Other Intangible Assets	December 29, 2012		Additions (Disposals)			June 29, 2013		December 29, 2012		Expense, net		June 29, 2013		December 29, 2012		June 29, 2013		June 29, 2013
Existing developed technologies	$	37,048	$	14,200		$	51,248	$	6,055	$	6,148	$	12,203	$	30,993	$	39,045	2.82
Trade name	4,500		(112		)	4,388		94		217		311		4,406		4,077		9.29
Customer relationships	17,000		—			17,000		445		1,068		1,513		16,555		15,487		7.29
Non-compete agreement	100		—			100		21		50		71		79		29		0.29
Backlog	3,500		—			3,500		2,594		906		3,500		906		—		—
Favorable lease asset	300		—			300		63		150		213		237		87		0.29
Total finite-lived intangible assets	62,448		14,088			76,536		9,272		8,539		17,811		53,176		58,725
In-process research and development	21,100		(14,200		)	6,900		—		—		—		21,100		6,900
Total intangible assets	$	83,548	$	(112	)	$	83,436	$	9,272	$	8,539	$	17,811	$	74,276	$	65,625

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense



Fiscal Year	Amount
2013	$	8,156
2014	18,780
2015	12,739
2016	8,720
2017	2,551
thereafter	7,779
Total	$	58,725

- Definition

Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule.

+ References + Details

Restructuring Charges (Tables)

6 Months Ended

Jun. 29, 2013

Restructuring and Related Activities [Abstract]

Schedule of Restructuring Reserve by Type of Cost

The activities in the restructuring accrual for the six months ended June 29, 2013 were as follows (in thousands):



	Employee Severance and Benefits			Property and Equipment Impairment			Contract Termination and Other Costs			Total
Accrual at December 29, 2012	$	548		$	—		$	68		$	616
Restructuring charges	1,468			2,743			14			4,225
Cash payments	(1,552		)	(32		)	(17		)	(1,601		)
Asset impairment				(2,743		)				(2,743		)
Adjustments to restructuring charges	(152		)	(5		)				(157		)
Other settlements	9			37			(65		)	(19		)
Accrual at June 29, 2013	$	321		$	—		$	—		$	321

Fair Value (Tables)

6 Months Ended

Jun. 29, 2013

Fair Value Disclosures [Abstract]

Fair Value, Assets Measured on Recurring Basis

Fair value measured on a recurring basis as of June 29, 2013 (in thousands):



	Level 1		Level 2		Total
Assets:
Cash equivalents
Money market funds	$	25,837	$	—	$	25,837
Agency securities (Federal)
Commercial paper	—		5,996		5,996
U. S. Treasuries	—		52,529		52,529
Agency securities	—		38,837		38,837
Total	$	25,837	$	97,362	$	123,199

Fair value measured on a recurring basis as of December 29, 2012 (in thousands):



	Level 1		Level 2		Total
Assets:
Cash equivalents
Money market funds	$	54,732	$	—	$	54,732
Marketable securities
U. S. Treasuries	—		43,587		43,587
Agency securities	—		49,958		49,958
Total	$	54,732	$	93,545	$	148,277

- Definition

Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

+ References + Details

Marketable Securities (Tables)

6 Months Ended

Jun. 29, 2013

Investments, Debt and Equity Securities [Abstract]

Schedule of Available-for-sale Securities Reconciliation

Marketable securities at June 29, 2013 consisted of the following (in thousands):



	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
U. S. Treasuries	$	52,495	$	51	$	(17	)	$	52,529
Commercial paper	5,996							5,996
Agency securities (Federal)	38,833		16		(12		)	38,837
	$	97,324	$	67	$	(29	)	$	97,362

Marketable securities at December 29, 2012 consisted of the following (in thousands):



	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
U. S. Treasuries	$	43,490	$	97	$	—		$	43,587
Agency securities (Federal)	49,896		63		(1		)	49,958
	$	93,386	$	160	$	(1	)	$	93,545

Investments Classified by Contractual Maturity Date

Contractual maturities of marketable securities as of June 29, 2013 were as follows (in thousands):



	Amortized Cost		Fair Value
Due in one year or less	$	75,333	$	75,374
Due after one year to five years	21,991		21,988
	$	97,324	$	97,362

Allowance for Doubtful Accounts (Tables)

6 Months Ended

Jun. 29, 2013

Receivables [Abstract]

Schedule of Credit Losses for Financing Receivables, Current

A reconciliation of the changes in our allowance for doubtful accounts receivable for the six months ended June 29, 2013 and June 30, 2012 is as follows (in thousands):



	June 29, 2013			June 30, 2012
Balance at beginning of period	$	290		$	238
Additions	—			30
Reductions	(19		)	—
Balance at end of period	$	271		$	268

Inventory (Tables)

6 Months Ended

Jun. 29, 2013

Inventory Disclosure [Abstract]

Schedule of Inventory, Current

Inventories consisted of the following (in thousands):



	June 29, 2013		December 29, 2012
Raw materials	$	8,038	$	8,702
Work-in-progress	15,168		11,181
Finished goods	2,924		3,733
	$	26,130	$	23,616

Warranty (Tables)

6 Months Ended

Jun. 29, 2013

Product Warranties Disclosures [Abstract]

Schedule of Product Warranty Liability

A reconciliation of the changes in our warranty liability for the six months ended June 29, 2013 and June 30, 2012 is as follows (in thousands):



	June 29, 2013			June 30, 2012
Balance at beginning of period	$	734		$	330
Accruals	109			497
Settlements	(532		)	(383		)
Balance at the end of period	$	311		$	444

Long-lived Assets (Tables)

6 Months Ended

Jun. 29, 2013

Long-Lived Assets Disclosure [Abstract]

Property, plant and equipment Including Construction-in-progress [Table Text Block]

Property, plant and equipment consisted of the following (in thousands):



	June 29, 2013			December 29, 2012
Building	$	790		$	790
Machinery and equipment	149,736			140,320
Computer equipment and software	38,050			38,092
Capital leases	2,525			2,367
Furniture and fixtures	5,990			6,249
Leasehold improvements	69,992			71,418
Sub total	267,083			259,236
Less: accumulated depreciation and amortization	(231,571		)	(227,126		)
Net long-lived assets	35,512			32,110
Construction-in-progress	4,118			13,405
Total	$	39,630		$	45,515

Accumulated Other Comprehensive Income (Tables)

6 Months Ended

Jun. 29, 2013

Other Comprehensive Income (Loss), before Tax [Abstract]

Schedule of Accumulated Other Comprehensive Income (Loss)



	June 29, 2013			December 29, 2012
Unrealized loss on marketable securities, net of tax of $428 at June 29, 2013 and December 29, 2012, respectively	$	(390	)	$	(270	)
Cumulative translation adjustments	418			1,985
Accumulated other comprehensive income	$	28		$	1,715

Stockholders' Equity (Tables)

6 Months Ended

Jun. 29, 2013

Stockholders' Equity Note [Abstract]

Schedule of Share-based Compensation, Stock Options, Activity

Stock option activity under our equity incentive plans during the six months ended June 29, 2013 is set forth below:



	Number of Options		Weighted Average Exercise Price		Weighted Average Remaining Contractual Life in Years	Aggregate Intrinsic Value
Outstanding at December 29, 2012	4,208,847		$	13.11	3.69	$	—
Options granted	—		—		0.00	—
Options exercised	(20,000	)	5.28		0.00	—
Options canceled	(456,179	)	15.84		0.00	—
Outstanding at June 29, 2013	3,732,668		$	12.82	3.21	$	32,250
Vested and expected to vest at June 29, 2013	3,706,544		$	12.85	3.20	$	28,772
Exercisable at June 29, 2013	3,125,370		$	13.51	3.01	$	—

Schedule of Share-based Compensation, Restricted Stock Units Award Activity

Restricted stock unit activity under our equity incentive plans during the six months ended June 29, 2013 is set forth below:



	Units		Weighted Average Grant Date Fair Value
Restricted stock units at December 29, 2012	2,228,946		$	7.66
Awards granted	1,624,000		5.01
Awards vested	(644,407	)	8.79
Awards canceled	(176,062	)	9.04
Restricted stock units at June 29, 2013	3,032,477		$	5.92

Stock-Based Compensation (Tables)

6 Months Ended

Jun. 29, 2013

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs

The table below shows stock-based compensation charges included in the Condensed Consolidated Statements of Operations (in thousands):



	Three Months Ended				Six Months Ended
	June 29, 2013		June 30, 2012		June 29, 2013		June 30, 2012
Stock-based compensation included in:
Cost of revenues	$	638	$	716	$	1,162	$	1,229
Research and development	841		1,249		1,842		2,298
Selling, general and administrative	1,653		1,513		3,163		2,994
Total stock-based compensation	3,132		3,478		6,167		6,521
Tax effect on stock-based compensation	—		—		—		—
Total stock-based compensation, net of tax	$	3,132	$	3,478	$	6,167	$	6,521

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions

The following weighted-average assumptions were used in the estimated grant-date fair value calculations for stock options:



	Three Months Ended				Six Months Ended
	June 29, 2013		June 30, 2012		June 29, 2013		June 30, 2012
Stock Options:
Dividend yield	—	%	—	%	—	%	—	%
Expected volatility	—	%	—	%	—	%	47.7	%
Risk-free interest rate	—	%	—	%	—	%	0.46	%
Expected term (in years)	0		0		0		3.49

Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions

The following weighted-average assumptions were used in estimating the fair value of employees' purchase rights under our approved employee stock purchase plans:



	Three Months Ended				Six Months Ended
	June 29, 2013		June 30, 2012		June 29, 2013		June 30, 2012
ESPP:
Dividend yield	—	%	—	%	—	%	—	%
Expected volatility	38.4	%	47.0	%	40.7	%	47.6	%
Risk-free interest rate	0.11	%	0.09	%	0.15	%	0.12	%
Expected term (in years)	0.5		0.5		0.6		0.5

Schedule of Unrecognized Compensation Cost, Nonvested Awards

At June 29, 2013, the unrecognized stock-based compensation, adjusted for estimated forfeitures, was as follows (in thousands):



	Unrecognized Expense		Average Expected Recognition Period in Years
Stock options	$	1,472	1.00
Restricted stock units	10,644		1.76
Employee Stock Purchase Plan	62		0.09
Total unrecognized stock-based compensation expense	$	12,178

- Definition

Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed.

+ References + Details

Net Loss per Share (Tables)

6 Months Ended

Jun. 29, 2013

Earnings Per Share [Abstract]

Schedule of Calculation of Numerator and Denominator in Earnings Per Share

A reconciliation of the numerator and denominator used in the calculation of basic and diluted net loss per share is as follows (in thousands):



	Three Months Ended						Six Months Ended
	June 29, 2013			June 30, 2012			June 29, 2013			June 30, 2012
Numerator:
Net loss used in computing basic and diluted net loss per share	$	(8,407	)	$	(4,217	)	$	(28,180	)	$	(21,671	)
Denominator:
Weighted-average shares used in computing basic net loss per share	54,105			49,817			53,886			49,652
Add potentially dilutive securities	—			—			—			—
Weighted average shares used in computing basic and diluted net loss per share	54,105			49,817			53,886			49,652

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share



	Three Months Ended		Six Months Ended
	June 29, 2013	June 30, 2012	June 29, 2013	June 30, 2012
Options to purchase common stock	3,970	4,464	4,075	4,538
Restricted stock units	523	1,304	622	1,258
Employee stock purchase plan	31	32	18	10
Total potentially dilutive securities	4,524	5,800	4,715	5,806

Derivative Financial Instruments (Tables)

6 Months Ended

Jun. 29, 2013

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Foreign Exchange Contracts, Statement of Financial Position

The following table provides information about our foreign currency forward contracts outstanding as of June 29, 2013 (in thousands):



Currency	Contract Position	Contract Amount (Local Currency)		Contract Amount (U.S. Dollars)
Japanese Yen	Sell	15,358		$	154
Taiwan Dollar	Buy	(10,165	)	(341		)
Korean Won	Buy	(186,432	)	(163		)
Total USD notional amount of outstanding foreign exchange contracts				$	(350	)

Schedule of Other Derivatives Not Designated as Hedging Instruments, Statements of Financial Performance and Financial Position, Location



		Amount of Gain Recognized on Derivatives
		Three Months Ended						Six Months Ended
Derivatives Not Designated as Hedging Instruments	Location of Gain or (Loss) Recognized on Derivatives	June 29, 2013			June 30, 2012				June 29, 2013			June 30, 2012
Foreign exchange forward contracts	Other income, net	$	(23	)	$	(360	)		$	(251	)	$	1

Basis of Presentation and Summary of Significant Accounting Policies (Details)	6 Months Ended
	Jun. 29, 2013
Minimum [Member]
Significant Accounting Policies [Line Items]
Number of Weeks for Year End	52
Maximum [Member]
Significant Accounting Policies [Line Items]
Number of Weeks for Year End	53

Concentration of Credit and Other Risks (Details) - Customer Concentration Risk [Member] - Customer	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 29, 2013	Jun. 30, 2012	Jun. 29, 2013	Jun. 30, 2012	Dec. 29, 2012
Sales Revenue, Goods, Net [Member]
Concentration Risk [Line Items]
Concentration Risk, Number of Customers		1		2
Sales Revenue, Goods, Net [Member] \| Major Customer 1 [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	20.00%	36.00%	20.00%	36.00%
Sales Revenue, Goods, Net [Member] \| Major Customer 2 [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	15.00%		16.00%	12.00%
Accounts Receivable [Member]
Concentration Risk [Line Items]
Concentration Risk, Number of Customers			3		1
Accounts Receivable [Member] \| Major Customer 1 [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage			16.00%		29.00%
Accounts Receivable [Member] \| Major Customer 2 [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage			12.00%
Accounts Receivable [Member] \| Major Customer 3 [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage			11.00%

Acquisition Assets acquired and liabilities assumed (Details) - USD ($) $ in Thousands	Oct. 16, 2012	Jun. 29, 2013	Mar. 30, 2013	Dec. 29, 2012
Business Acquisition [Line Items]
Goodwill		$ 29,958	$ 31,100	$ 30,994
Astria Semiconductor Holdings, Inc. [Member]
Business Acquisition [Line Items]
Tangible net assets	$ 33,562
Intangible assets	77,600
Deferred income tax liabilities	(26,663)
Goodwill	30,000
Total acquisition price	114,457
Scenario, Previously Reported [Member] \| Astria Semiconductor Holdings, Inc. [Member]
Business Acquisition [Line Items]
Tangible net assets	31,842
Intangible assets	77,600
Deferred income tax liabilities	(26,663)
Goodwill	30,994
Total acquisition price	$ 113,773

- Definition

Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 45
-Subparagraph e
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 43
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 72
-Subparagraph d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 45
-Subparagraph e
-Clause 1
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 68
-Subparagraph l
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 34
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Acquisition (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended			6 Months Ended
	Oct. 16, 2012	Jun. 29, 2013	Mar. 30, 2013	Dec. 29, 2012	Jun. 29, 2013
Business Acquisition [Line Items]
Gain (Loss) Related to Litigation Settlement				$ (3,300)
Goodwill recorded from business acquisition		$ 29,958	$ 31,100	$ 30,994	$ 29,958
Astria Semiconductor Holdings, Inc. [Member]
Business Acquisition [Line Items]
Total consideration	$ 114,500
Cash consideration	100,000
Consideration Transferred Decrease Based on Working Capital As Of The Consummation Of the Acquisition Relative To an Agreed Upon Target	$ 2,600
Number of shares consideration	3,020,944
Cost Per Share	$ 4.57
Identifiable intangible assets recorded from business acquisition	$ 77,600
Net tangible assets recorded from business acquisition	6,900
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities, Net	26,663
Goodwill recorded from business acquisition	$ 30,000
Revenues			$ 42,600
Pro forma financial information
Increase Decrease in Amortization Expense		3,000			6,000
Fair Value of Acquired Identifiable Intangible Assets [Member] \| Astria Semiconductor Holdings, Inc. [Member]
Pro forma financial information
Increase Decrease in Amortization Expense		1,500			3,000
Fair Value Adjustment to Inventory [Member] \| Astria Semiconductor Holdings, Inc. [Member]
Pro forma financial information
Businss Combination Other Non Recurring Expenses		500			1,600
Acquisition-related Costs [Member] \| Astria Semiconductor Holdings, Inc. [Member]
Pro forma financial information
Integration and Acquisition Expenses		$ 300			$ 1,200

Acquisition Pro Forma Information (Details) - Astria Semiconductor Holdings, Inc. [Member] - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 29, 2013	Jun. 30, 2012	Jun. 29, 2013	Jun. 30, 2012
Business Acquisition [Line Items]
Revenues	$ 62,733	$ 79,648	$ 115,353	$ 141,656
Net loss	$ (6,410)	$ (4,679)	$ (22,662)	$ (21,250)
Net loss per share - basic	$ (0.12)	$ (0.09)	$ (0.42)	$ (0.40)

- Definition

The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References + Details

Intangible Assets and Goodwill - Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 29, 2013	Jun. 29, 2013	Jun. 30, 2012
Goodwill [Roll Forward]
Goodwill	$ 31,100	$ 30,994
Working capital adjustments affecting the MicroProbe purchase price		684
Change in fair value of net intangible and tangible assets	(965)	(578)
Sale of subsidiary	(177)	(300)	$ 0
Goodwill	$ 29,958	$ 29,958

- Definition

+ References

+ Details

Intangible Assets and Goodwill - Finite-Lived (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 30, 2013	Jun. 29, 2013	Dec. 29, 2012
Finite-lived Intangible Assets [Roll Forward]
Intangible Assets, Gross Amount		$ 62,448
Additions		14,088
Intangible Assets, Gross Amount		76,536
Accumulated Amortization		9,272
Expense		8,539
Accumulated Amortization		17,811
Intangible Assets, Net		58,725	$ 53,176
Intangible Assets Net Excluding Goodwill [Roll Forward]
Intangible Assets Net Excluding Goodwill Gross		83,548
Intangible Assets Net Excluding Goodwill Acquired During Period		(112)
Intangible Assets Net Excluding Goodwill Gross		83,436
Intangible Assets, Net (Excluding Goodwill)		65,625	74,276
Existing developed technologies
Finite-lived Intangible Assets [Roll Forward]
Intangible Assets, Gross Amount		37,048
Additions		14,200
Intangible Assets, Gross Amount		51,248
Accumulated Amortization		6,055
Expense		6,148
Accumulated Amortization		12,203
Intangible Assets, Net		$ 39,045	30,993
Weight Average Useful Life		2 years 9 months 26 days
Trade name
Finite-lived Intangible Assets [Roll Forward]
Intangible Assets, Gross Amount		$ 4,500
Additions		(112)
Intangible Assets, Gross Amount		4,388
Accumulated Amortization		94
Expense		217
Accumulated Amortization		311
Intangible Assets, Net		$ 4,077	4,406
Weight Average Useful Life		9 years 3 months 15 days
Customer relationships
Finite-lived Intangible Assets [Roll Forward]
Intangible Assets, Gross Amount		$ 17,000
Intangible Assets, Gross Amount		17,000
Accumulated Amortization		445
Expense		1,068
Accumulated Amortization		1,513
Intangible Assets, Net		$ 15,487	16,555
Weight Average Useful Life		7 years 3 months 15 days
Non-compete agreement
Finite-lived Intangible Assets [Roll Forward]
Intangible Assets, Gross Amount		$ 100
Intangible Assets, Gross Amount		100
Accumulated Amortization		21
Expense		50
Accumulated Amortization		71
Intangible Assets, Net		$ 29	79
Weight Average Useful Life		3 months 15 days
Backlog
Finite-lived Intangible Assets [Roll Forward]
Intangible Assets, Gross Amount		$ 3,500
Intangible Assets, Gross Amount		3,500
Accumulated Amortization		2,594
Expense		906
Accumulated Amortization		3,500
Intangible Assets, Net		0	906
Favorable lease asset
Finite-lived Intangible Assets [Roll Forward]
Intangible Assets, Gross Amount		300
Intangible Assets, Gross Amount		300
Accumulated Amortization		63
Expense		150
Accumulated Amortization		213
Intangible Assets, Net		$ 87	237
Weight Average Useful Life		3 months 15 days
In-process research and development
Finite-lived Intangible Assets [Roll Forward]
Additions	$ 10,100	$ 4,100
Indefinite-lived Intangible Assets [Roll Forward]
Beginning Balance		21,100
Indefinite-lived Intangible Assets, Acquired During Period		(14,200)
Ending Balance		6,900
Intangible Assets Net Excluding Goodwill [Roll Forward]
Intangible Assets, Net (Excluding Goodwill)		$ 65,625	$ 74,276

Intangible Assets and Goodwill - Amortization (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 29, 2013	Jun. 30, 2012	Jun. 29, 2013	Jun. 30, 2012
Property, Plant and Equipment [Line Items]
Working capital adjustments affecting the MicroProbe purchase price			$ 684
Goodwill, Other Changes	$ 965		578
Sale of subsidiary	(177)		(300)	$ 0
Amortization of Intangible Assets			8,539
Finite-Lived Intangible Assets, Net, Amortization Expense, Rolling Maturity [Abstract]
2013	8,156		8,156
2014	18,780		18,780
2015	12,739		12,739
2016	8,720		8,720
2017	2,551		2,551
thereafter	7,779		7,779
Total	58,725		58,725
Cost of Sales [Member] \| Intellectual Property [Member]
Property, Plant and Equipment [Line Items]
Amortization of Intangible Assets	3,400	$ 300	7,000	$ 600
Selling, General and Administrative [Member] \| Intellectual Property [Member]
Property, Plant and Equipment [Line Items]
Amortization of Intangible Assets	$ 800		$ 1,500

Restructuring Charges (Details) $ in Thousands	3 Months Ended			6 Months Ended
Restructuring Charges (Details) $ in Thousands	Jun. 29, 2013 USD ($) Employee	Mar. 30, 2013 USD ($) Employee	Jun. 30, 2012 USD ($)	Jun. 29, 2013 USD ($)	Jun. 30, 2012 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 92		$ 136	$ 4,072	$ 103
Restructuring and Related Cost, Number of Positions Eliminated		20
Restructuring Costs and Asset Impairment Charges				2,743
Restructuring Charges, Gross				4,225
Restructuring and Related Cost, Expected Quarterly Savings	2,500	$ 2,000
Q1 2013 Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Number of Positions Eliminated \| Employee		31
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 100	$ 1,318
Restructuring and Related Cost, Number of Positions Eliminated \| Employee	4
Restructuring Costs and Asset Impairment Charges
Restructuring Charges, Gross			$ 100	1,468
Contract Termination [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Costs and Asset Impairment Charges
Restructuring Charges, Gross				14
Property and Equipment Impairment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Costs and Asset Impairment Charges				2,743
Restructuring Charges, Gross				$ 2,743
Property and Equipment Impairment [Member] \| Q1 2013 Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Costs and Asset Impairment Charges		(2,700)
Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges, Gross		$ 4,000

Restructuring Charges Table (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 29, 2013
Restructuring Reserve [Roll Forward]
Accrual		$ 616
Restructuring Charges		4,225
Cash payments		(1,601)
Asset impairment		(2,743)
Adjustments to restructuring charges		(157)
Other settlements		(19)
Accrual		321
Employee Severance and Benefits [Member]
Restructuring Reserve [Roll Forward]
Accrual		548
Restructuring Charges	$ 100	1,468
Cash payments		(1,552)
Asset impairment
Adjustments to restructuring charges		(152)
Other settlements		9
Accrual		321
Property and Equipment Impairment [Member]
Restructuring Reserve [Roll Forward]
Accrual		0
Restructuring Charges		2,743
Cash payments		(32)
Asset impairment		(2,743)
Adjustments to restructuring charges		(5)
Other settlements		37
Accrual		0
Contract Termination and Other [Member]
Restructuring Reserve [Roll Forward]
Accrual		68
Restructuring Charges		14
Cash payments		(17)
Asset impairment
Adjustments to restructuring charges
Other settlements		(65)
Accrual		$ 0

Fair Value (Details) - USD ($) $ in Thousands	Jun. 29, 2013	Dec. 29, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total	$ 123,199	$ 148,277
Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total	25,837	54,732
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total	97,362	93,545
Money Market Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	25,837	54,732
Money Market Funds [Member] \| Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	25,837	54,732
Money Market Funds [Member] \| Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	0	0
Commercial paper [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	5,996
Commercial paper [Member] \| Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	0
Commercial paper [Member] \| Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	5,996
U.S. Treasury [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable securities	52,529	43,587
U.S. Treasury [Member] \| Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable securities	0	0
U.S. Treasury [Member] \| Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable securities	52,529	43,587
Agency securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure
Marketable securities	38,837	49,958
Agency securities [Member] \| Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure
Marketable securities	0	0
Agency securities [Member] \| Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure
Marketable securities	$ 38,837	$ 49,958

Fair Value Fair Value (Narrative) (Details) $ in Thousands	3 Months Ended	6 Months Ended
Fair Value Fair Value (Narrative) (Details) $ in Thousands	Jun. 29, 2013 USD ($)	Jun. 29, 2013 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Purchase consideration	$ 1,000
Expected term		7 years
Interest rate	5.00%
Notes Receivable, Fair Value Disclosure	$ 470	$ 470
Cash [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Purchase consideration	180
Accounts Receivable [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Purchase consideration	$ 820

Marketable Securities (Details) - USD ($) $ in Thousands	Jun. 29, 2013	Dec. 29, 2012
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 97,324	$ 93,386
Gross Unrealized Gains	67	160
Gross Unrealized Losses	(29)	(1)
Fair Value	97,362	93,545
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Due in one year or less, Amortized Cost	75,333
Due after one year to five years, Amortized Cost	21,991
Amortized Cost	97,324	93,386
Available-for-sale Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]
Due in one year or less, Fair Value	75,374
Due after one year to five years, Fair Value	21,988
U.S. Treasury [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	52,495	43,490
Gross Unrealized Gains	51	97
Gross Unrealized Losses	(17)	0
Fair Value	52,529	43,587
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Amortized Cost	52,495	43,490
Agency securities (Federal) [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	38,833	49,896
Gross Unrealized Gains	16	63
Gross Unrealized Losses	(12)	(1)
Fair Value	38,837	49,958
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Amortized Cost	38,833	$ 49,896
Commercial paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	5,996
Fair Value	5,996
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Amortized Cost	$ 5,996

Allowance for Doubtful Accounts (Details) - USD ($)	3 Months Ended		6 Months Ended
Allowance for Doubtful Accounts (Details) - USD ($)	Jun. 29, 2013	Jun. 30, 2012	Jun. 29, 2013
Receivables [Abstract]
Allowance for Doubtful Accounts Receivable, Current		$ 30,000
Allowance for Doubtful Accounts Receivable, Recoveries			$ (94,000)
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance at beginning of period			290,000
Additions	$ 0	30,000
Reductions	(19,000)	0	(19)
Balance at end of period	$ 271,000	$ 268,000	$ 271,000

Inventories (Details) - USD ($) $ in Thousands	Jun. 29, 2013	Dec. 29, 2012
Inventory Disclosure [Abstract]
Raw materials	$ 8,038	$ 8,702
Work-in-progress	15,168	11,181
Finished goods	2,924	3,733
Inventory, Net	$ 26,130	$ 23,616

Warranty (Details) - USD ($) $ in Thousands	6 Months Ended
Warranty (Details) - USD ($) $ in Thousands	Jun. 29, 2013	Jun. 30, 2012
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]
Beginning balance	$ 734	$ 330
Accruals	109	497
Settlements	(532)	(383)
Ending balance	$ 311	$ 444

Long-lived Assets Long-lived Assets (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 29, 2013	Jun. 30, 2012	Jun. 29, 2013	Jun. 30, 2012
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment of Long-Lived Assets to be Disposed of	$ 121	$ 61	$ 179	$ 229
Assets previously held for sale [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment of Long-Lived Assets to be Disposed of		$ 100		$ 200

Long-lived Assets (Details) - USD ($) $ in Thousands	Jun. 29, 2013	Dec. 29, 2012
Property, Plant and Equipment [Line Items]
Property Plant And Equipment Net, Excludes Construction in Progress Gross	$ 267,083	$ 259,236
Less: Accumulated depreciation, amortization and enterprise-wide impairment	(231,571)	(227,126)
Property Plant And Equipment Net, Excludes Construction in Progress	35,512	32,110
Construction in Progress, Gross	4,118	13,405
Property, Plant and Equipment, Net	39,630	45,515
Building [Member]
Property, Plant and Equipment [Line Items]
Property Plant And Equipment Net, Excludes Construction in Progress Gross	790	790
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property Plant And Equipment Net, Excludes Construction in Progress Gross	149,736	140,320
Computer Equipment and Software [Member]
Property, Plant and Equipment [Line Items]
Property Plant And Equipment Net, Excludes Construction in Progress Gross	38,050	38,092
Assets Held under Capital Leases [Member]
Property, Plant and Equipment [Line Items]
Property Plant And Equipment Net, Excludes Construction in Progress Gross	2,525	2,367
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property Plant And Equipment Net, Excludes Construction in Progress Gross	5,990	6,249
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property Plant And Equipment Net, Excludes Construction in Progress Gross	$ 69,992	$ 71,418

Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2012	Jun. 29, 2013
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Unrealized loss on marketable securities, net of tax of $428 at June 29, 2013 and December 29, 2012, respectively	$ (270)	$ (390)
Cumulative translation adjustments	1,985	418
Accumulated other comprehensive income	1,715	$ 28
Other Comprehensive Income (Loss), Available-for-sale Securities, Tax	$ 428

- Definition

Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e681-108580

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e637-108580

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669646-108580

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14A
-URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669686-108580

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
-SubTopic 30
-Section 45
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=6915805&loc=d3e32022-110900

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
-SubTopic 30
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 52
-Paragraph 12, 13
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 45
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 52
-Paragraph 31
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 12
-Paragraph 10
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 17, 18, 19, 22, 23, 24, 25, 26
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e637-108580

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
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-Section 45
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
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-Paragraph 14A
-URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669686-108580

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 31
-Article 5

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS115-1/124-1
-Paragraph 15D
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 12
-Paragraph 10
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 14, 17, 26
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

+ Details

Stockholders' Equity Stockholders' Equity (Details) - Employee Stock [Member]	6 Months Ended
	Jun. 29, 2013
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Period	3 years
Award Expiration Period	5 years
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Period	4 years
Award Expiration Period	10 years

Stock Options Table (Details) - Equity Incentive Plan [Member] - USD ($)	3 Months Ended	6 Months Ended	12 Months Ended
	Mar. 30, 2013	Jun. 29, 2013	Dec. 29, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Outstanding, Number of Options (number of shares)	4,208,847	4,208,847
Options granted, Number of Options (number of shares)		0
Options exercised, Number of Options (number of shares)		(20,000)
Options canceled, Number of Options (number of shares)		(456,179)
Outstanding, Number of Options (number of shares)		3,732,668	4,208,847
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price	$ 13.11	$ 13.11
Options granted, Weighted Average Exercise Price (in USD)		0.00
Options canceled, Weighted Average Exercise Price (in USD)		5.28
Options canceled, Weighted Average Exercise Price (in USD)		15.84
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price		$ 12.82	$ 13.11
Outstanding at June 29, 2013	3 years 2 months 16 days	3 years 2 months 9 days	3 years 8 months 8 days
Outstanding at June 29, 2013		$ 32,250
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest [Abstract]
Vested and expected to vest at June 29, 2013		3,706,544
Vested and expected to vest at June 29, 2013		$ 12.85
Options granted	3 years 2 months 12 days	3 years 2 months 1 day
Vested and expected to vest at June 29, 2013		$ 28,772,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Exercisable at June 29, 2013		3,125,370
Exercisable at June 29, 2013		$ 13.51
Options exercised	3 years 4 days	2 years 10 months 13 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value		$ 0
Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options		$ 106,000

Restricted Stock Units (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		6 Months Ended
	May 06, 2013	Jun. 29, 2013	Jun. 30, 2012	Jun. 29, 2013	Jun. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Stock-based compensation expense				$ 6,167	$ 6,521
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Total fair value of restricted stock units vested during the period		$ 3,500		$ 5,700
Equity Incentive Plan [Member] \| Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Non-vested restricted stock units				2,228,946
Awards granted				1,624,000
Awards released				(644,407)
Awards canceled				(176,062)
Non-vested restricted stock units		3,032,477		3,032,477
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Weighted Average Exercise Price Non-vested restricted stock units				$ 7.66
Weighted Average Awards Granted fair value				5.01
Weighted Average Awards released fair value				8.79
Weighted Average Awards canceled fair value				9.04
Weighted Average Exercise Price Non-vested restricted stock units		$ 5.92		$ 5.92
Shares issued in period	355,000,000
Stock-based compensation expense				$ 100
Total fair value of restricted stock units vested during the period			$ 2,300		$ 2,700

Employee Stock Purchase Plan (Details) - purchase_period	3 Months Ended	6 Months Ended	12 Months Ended
	Mar. 30, 2013	Jun. 29, 2013	Dec. 29, 2012
Employee Stock [Member]
Class of Stock [Line Items]
Purchase Price of Common Stock, Percent			85.00%
Equity Incentive Plan [Member]
Class of Stock [Line Items]
Options, Outstanding, Weighted Average Remaining Contractual Term	3 years 2 months 16 days	3 years 2 months 9 days	3 years 8 months 8 days
Twelve Month Purhcase Period [Member] \| Equity Incentive Plan [Member] \| Employee Stock [Member]
Class of Stock [Line Items]
Number of Stock Purchase Periods		2
Six Month Purchase Period [Member] \| Equity Incentive Plan [Member] \| Employee Stock [Member]
Class of Stock [Line Items]
Number of Stock Purchase Periods		1

Stock-Based Compensation (Details) - $ / shares	3 Months Ended	6 Months Ended
Stock-Based Compensation (Details) - $ / shares	Jun. 30, 2012	Jun. 29, 2013
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted		45,000
Weighted average grant-date fair value		$ 1.84
Employee Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Issued During Period, Shares, Employee Stock Purchase Plans	293,161	286,928

- Definition

Number of shares issued during the period as a result of an employee stock purchase plan.

+ References + Details

Stock-Based Compensation Included in Condensed Consolidated Statement of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 29, 2013	Jun. 30, 2012	Jun. 29, 2013	Jun. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	$ 3,132	$ 3,478	$ 6,167	$ 6,521
Tax effect on stock-based compensation	0	0
Total stock-based compensation, net of tax	3,132	3,478	6,167	6,521
Cost of revenues [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	638	716	1,162	1,229
Research and Development [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	841	1,249	1,842	2,298
Selling, General and Administrative [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	$ 1,653	$ 1,513	$ 3,163	$ 2,994

- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References + Details

Stock-Based Compensation Valuation Assumptions (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 29, 2013	Jun. 30, 2012	Jun. 29, 2013	Jun. 30, 2012
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted			45,000
Dividend yield	0.00%	0.00%	0.00%	0.00%
Expected volatility	0.00%	0.00%	0.00%	47.70%
Risk-free interest rate	0.00%	0.00%	0.00%	0.46%
Expected term (in years)	7 years	3 years 5 months 27 days	4 years 9 months	3 years 5 months 27 days
Employee Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Issued During Period, Shares, Employee Stock Purchase Plans		293,161	286,928
Dividend yield	0.00%	0.00%	0.00%	0.00%
Expected volatility	38.40%	47.00%	40.70%	47.60%
Risk-free interest rate	0.11%	0.09%	0.15%	0.12%
Expected term (in years)	6 months	6 months	7 months 6 days	6 months

- Definition

Number of shares issued during the period as a result of an employee stock purchase plan.

+ References + Details

Stock-Based Compensation Unrecognized Compensation Costs (Details) $ in Thousands	6 Months Ended
	Jun. 29, 2013 USD ($)
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized [Abstract]
Total unrecognized stock-based compensation expense	$ 12,178
Stock Options [Member]
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized [Abstract]
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Stock Options	$ 1,472
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	1 year
Restricted stock units [Member]
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized [Abstract]
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Share-based Awards Other than Options	$ 10,644
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	1 year 9 months 4 days
Employee Stock Purchase Plan [Member]
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized [Abstract]
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Share-based Awards Other than Options	$ 62
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	1 month 2 days

Net Loss per Share (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 29, 2013	Jun. 30, 2012	Jun. 29, 2013	Jun. 30, 2012
Numerator [Abstract]
Net loss used in computing basic and diluted net loss per share	$ (8,407)	$ (4,217)	$ (28,180)	$ (21,671)
Denominator [Abstract]
Weighted-average shares used in computing basic net loss per share	54,105	49,817	53,886	49,652
Add potentially dilutive securities	0	0	0	0
Weighted average shares used in computing basic and diluted net loss per share	54,105	49,817	53,886	49,652

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

+ Details

- Definition

Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1448-109256

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Weighted-Average Number of Common Shares Outstanding
-URI http://asc.fasb.org/extlink&oid=6528421

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 07-4
-Paragraph 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 8
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 171
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 40
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Net Loss Per Share Weighted-Average Dilutive Securities (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 29, 2013	Jun. 30, 2012	Jun. 29, 2013	Jun. 30, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potentially dilutive securities	4,524	5,800	4,715	5,806
Options to purchase common stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potentially dilutive securities	3,970	4,464	4,075	4,538
Restricted stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potentially dilutive securities	523	1,304	622	1,258
Employee stock purchase plan
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potentially dilutive securities	31	32	18	10

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Antidilution
-URI http://asc.fasb.org/extlink&oid=6505113

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Diluted Earnings Per Share
-URI http://asc.fasb.org/extlink&oid=6510752

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Contingent Stock Agreement
-URI http://asc.fasb.org/extlink&oid=6508534

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 40
-Subparagraph c
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 13, 14
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 07-4
-Paragraph 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 171
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Income Taxes (Details) - USD ($) $ in Thousands	Jun. 29, 2013	Jun. 30, 2012	Jun. 29, 2013	Jun. 30, 2012
Income Tax [Line Items]
Income Tax Expense (Benefit)	$ (202)	$ 1,551	$ 5	$ 1,449
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	2,500		2,500
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	3
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	$ (400)	$ 200	(400)	$ 200
Maximum [Member]
Income Tax [Line Items]
Unrecognized Tax Benefits, Period Increase (Decrease)			$ 17,200

Derivative Financial Instruments (Details) - Foreign Exchange Forward [Member] - Not Designated as Hedging Instrument [Member] ₩ in Thousands, ¥ in Thousands, $ in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 29, 2013 USD ($)	Jun. 30, 2012 USD ($)	Jun. 29, 2013 USD ($)	Jun. 30, 2012 USD ($)	Jun. 29, 2013 JPY (¥)	Jun. 29, 2013 KRW (₩)	Jun. 29, 2013 TWD ($)	Jun. 29, 2013 USD ($)
Derivatives, Fair Value [Line Items]
Notional Amount of Foreign Currency Derivative Sale Contracts					¥ 15,358			$ 154
Total USD notional amount of outstanding foreign exchange contracts								(350)
Other Income (Expense), Net [Member]
Derivative Instruments, Gain (Loss) Recognized in Income, Net [Abstract]
Foreign exchange forward contracts	$ (23)	$ (360)	$ (251)	$ 1
Taiwan, New Dollars
Derivatives, Fair Value [Line Items]
Notional Amount of Foreign Currency Derivative Sale Contracts							$ (10,165)	341
Korean Won [Member]
Derivatives, Fair Value [Line Items]
Notional Amount of Foreign Currency Derivative Sale Contracts						₩ (186,432)		$ 163

Label	Element	Value
Allowance for Doubtful Accounts Receivable	us-gaap_AllowanceForDoubtfulAccountsReceivable	$ 238,000