0001039399-14-000029 | 10-Q | XBRL Viewer

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Document and Entity Information - shares	6 Months Ended
Document and Entity Information - shares	Jun. 28, 2014	Jul. 31, 2014
Document Information [Line Items]
Entity Registrant Name	FORMFACTOR INC.
Entity Central Index Key	0001039399
Current Fiscal Year End Date	--12-27
Entity Filer Category	Accelerated Filer
Document Type	10-Q
Document Period End Date	Jun. 28, 2014
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Common Stock, Shares Outstanding		56,378,144

Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2014	Jun. 29, 2013	Jun. 28, 2014	Jun. 29, 2013
Revenues	$ 67,352	$ 62,733	$ 123,311	$ 115,353
Cost of revenues	47,328	46,328	90,962	89,873
Gross profit	20,024	16,405	32,349	25,480
Operating expenses:
Research and development	11,074	10,915	20,821	21,844
Selling, general and administrative	13,191	13,487	25,445	28,105
Restructuring charges, net	59	92	2,056	4,072
Loss on sale of subsidiary	0	300	0	300
Impairment of long-lived assets	0	121	743	179
Total operating expenses	24,324	24,915	49,065	54,500
Operating loss	(4,300)	(8,510)	(16,716)	(29,020)
Interest income, net	79	96	158	203
Other income (expense), net	(156)	209	(222)	632
Loss before income taxes	(4,377)	(8,205)	(16,780)	(28,185)
Provision (benefit) for income taxes	(51)	202	257	(5)
Net loss	$ (4,326)	$ (8,407)	$ (17,037)	$ (28,180)
Net loss per share:
Basic and Diluted (In dollars per share)	$ (0.08)	$ (0.16)	$ (0.31)	$ (0.52)
Weighted-average number of shares used in per share calculations:
Basic and Diluted (In shares)	55,812	54,105	55,431	53,886

Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2014	Jun. 29, 2013	Jun. 28, 2014	Jun. 29, 2013
Net loss	$ (4,326)	$ (8,407)	$ (17,037)	$ (28,180)
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	297	(486)	438	(1,565)
Unrealized gains (losses) on available-for-sale marketable securities	22	(73)	24	(122)
Other comprehensive income (loss), net of tax	319	(559)	462	(1,687)
Comprehensive loss	$ (4,007)	$ (8,966)	$ (16,575)	$ (29,867)

- Definition

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

+ References + Details

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 28, 2014	Dec. 28, 2013
Current assets:
Cash and cash equivalents	$ 69,859	$ 59,196
Marketable securities	79,182	91,895
Accounts receivable, net	41,962	30,189
Inventories, net	22,050	20,707
Deferred tax assets	2,841	2,776
Refundable income taxes	782	782
Prepaid expenses and other current assets	7,476	6,106
Total current assets	224,152	211,651
Restricted cash	435	435
Property, plant and equipment, net	29,210	35,190
Goodwill	30,731	30,731
Intangibles, net	47,326	57,470
Deferred tax assets	3,983	3,960
Other assets	1,291	1,271
Total assets	337,128	340,708
Current liabilities:
Accounts payable	18,388	16,313
Accrued liabilities	17,205	13,985
Capital leases, current portion	0	270
Income taxes payable	493	172
Deferred revenue	7,238	7,030
Total current liabilities	43,324	37,770
Long-term income taxes payable	2,318	2,497
Deferred tax liabilities	3,029	3,029
Deferred rent and other liabilities	3,443	3,326
Total liabilities	52,114	46,622
Commitments and contingencies (Note 17)
Stockholders’ equity:
10,000,000 shares authorized; no shares issued and outstanding at June 28, 2014 and December 28, 2013, respectively	0	0
250,000,000 shares authorized; 56,112,677 and 54,649,600 shares issued and outstanding at June 28, 2014 and December 28, 2013, respectively	56	55
Additional paid-in capital	703,133	695,631
Accumulated other comprehensive gain (loss)	213	(249)
Accumulated deficit	(418,388)	(401,351)
Total stockholders’ equity	285,014	294,086
Total liabilities and stockholders’ equity	$ 337,128	$ 340,708

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - $ / shares	Jun. 28, 2014	Dec. 28, 2013
Stockholders' Equity:
Preferred stock, par value, in dollars per share	$ 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, in dollars per share	$ 0.001	$ 0.001
Common stock, shares authorized	250,000,000	250,000,000
Common stock, shares issued	56,112,677	54,649,600
Common stock, shares outstanding	56,112,677	54,649,600

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 28, 2014	Jun. 29, 2013
Cash flows from operating activities:
Net loss	$ (17,037)	$ (28,180)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	16,185	14,572
Amortization of discount on investments	168	145
Stock-based compensation expense	6,089	6,167
Deferred income tax (benefit) provision	(46)	146
Provision (recovery) for doubtful accounts receivable	1	(19)
Provision for excess and obsolete inventories	3,830	4,879
Loss on disposal and write-off of long-lived assets	2	318
Impairment of long-lived assets	743	179
Loss on sale of subsidiary	0	300
Non-cash restructuring	600	2,743
Foreign currency transaction (gains) losses	(178)	171
Changes in assets and liabilities:
Accounts receivable	(11,633)	(10,667)
Inventories	(5,170)	(7,558)
Prepaid expenses and other current assets	(436)	3,494
Refundable income taxes	0	4,357
Other assets	0	453
Accounts payable	2,400	5,124
Accrued liabilities	3,500	(2,562)
Income tax payable	140	215
Deferred rent and other liabilities	112	31
Deferred revenues	209	97
Net cash used in operating activities	(521)	(5,595)
Cash flows from investing activities:
Acquisition of property, plant and equipment	(2,994)	(5,071)
Proceeds (use of cash) from sale of subsidiary	54	(266)
Purchases of marketable securities	(31,693)	(51,053)
Proceeds from maturities of marketable securities	44,275	44,970
Change in restricted cash	0	(103)
Proceeds from sale of marketable securities	0	2,000
Net cash provided by (used in) investing activities	9,642	(9,523)
Cash flows from financing activities:
Proceeds from issuances of common stock	1,426	1,326
Purchase and retirement of common stock	0	(5)
Payments made on capital leases	(271)	(331)
Net cash provided by financing activities	1,155	990
Effect of exchange rate changes on cash and cash equivalents	387	(955)
Net decrease in cash and cash equivalents	10,663	(15,083)
Cash and cash equivalents, beginning of period	59,196	72,243
Cash and cash equivalents, end of period	69,859	57,160
Supplemental cash flow disclosures:
Changes in accounts payable and accrued liabilities related to property, plant and equipment purchases	(394)	(1,111)
Income and property taxes paid (refunded), net	$ 123	$ (4,397)

Basis of Presentation and Summary of Significant Accounting Policies	6 Months Ended
	Jun. 28, 2014
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 and six months ended June 28, 2014 are not necessarily indicative of the results that may be expected for the year ending December 27, 2014, or for any other period. The balance sheet at December 28, 2013 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 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 28, 2013 included in our Annual Report on Form 10-K filed with the SEC on March 7, 2014. Fiscal year. We operate on a 52/53 week fiscal year, whereby the fiscal year ends on the last Saturday of December. Fiscal 2014 and 2013 each contain 52 weeks and the three and six months ended June 28, 2014 and June 29, 2013 each contained 13 and 26 weeks, respectively. Fiscal 2014 will end on December 27, 2014. Critical Accounting Policies. Our critical accounting policies have not changed during the three and six months ended June 28, 2014 from those disclosed in our Annual Report on Form 10-K for the year ended December 28, 2013. Reclassifications. Certain reclassifications have been made to the prior year's Consolidated Balance Sheet to conform to the current period presentation.

Recent Accounting Pronouncements	6 Months Ended
Recent Accounting Pronouncements	Jun. 28, 2014
Accounting Policies [Abstract]
Recent Accounting Pronouncements	Recent Accounting Pronouncements In May 2014, the Financial Accounting Standards Board issued Accounting Standards Update No. 2014-09, "Revenue from Contracts with Customers". The guidance requires an entity to recognize revenue to depict the transfer of goods or services to customers in an amount that reflects the consideration to which an entity expects to be entitled in exchange for those goods or services. The guidance also requires expanded disclosures relating to the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers. Additionally, qualitative and quantitative disclosures are required about customer contracts, significant judgments and changes in judgments, and assets recognized from the costs to obtain or fulfill a contract. The standard permits the use of either the retrospective or cumulative effect transition method. This guidance will replace most existing revenue recognition guidance in United States generally accepted accounting principles when it becomes effective, which for us will be at the beginning of the first quarter of fiscal year 2017 using one of two prescribed transition methods. Early adoption is not permitted. We are evaluating the impact of the revenue recognition guidance on our consolidated financial statements and related disclosures. We have not yet selected a transition method nor have we determined the effect of the standard on our ongoing financial reporting.

- Definition

The entire disclosure of changes in accounting principles, including adoption of new accounting pronouncements, that describes the new methods, amount and effects on financial statement line items.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Change in Accounting Principle
-URI http://asc.fasb.org/extlink&oid=6507316

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Direct Effects of a Change in Accounting Principle
-URI http://asc.fasb.org/extlink&oid=6510796

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=28359718&loc=d3e22583-107794

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Indirect Effects of a Change in Accounting Principle
-URI http://asc.fasb.org/extlink&oid=6515603

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=28359718&loc=d3e22580-107794

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 270
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.10-01.(b)(6))
-URI http://asc.fasb.org/extlink&oid=27015980&loc=d3e46468-122699

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Accounting Change
-URI http://asc.fasb.org/extlink&oid=6503790

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=28359718&loc=d3e22499-107794

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Retrospective Application
-URI http://asc.fasb.org/extlink&oid=6523989

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 270
-SubTopic 10
-Section 45
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=6372559&loc=d3e765-108305

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 270
-SubTopic 10
-Section 45
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=6372559&loc=d3e725-108305

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 01
-Paragraph b
-Subparagraph 6
-Article 10

+ Details

Concentration of Credit and Other Risks

6 Months Ended

Jun. 28, 2014

Risks and Uncertainties [Abstract]

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. The following customers accounted for more than 10% of our revenues for the periods indicated:



	Three Months Ended				Six Months Ended
	June 28, 2014		June 29, 2013		June 28, 2014		June 29, 2013
SK Hynix	21.4	%	20.1	%	19.5	%	19.7	%
Intel	19.5		14.6		18.0		16.1
Micron	12.2		*		13.5		*
	53.1	%	34.7	%	51.0	%	35.8	%


*	Less than 10% of revenues.

At June 28, 2014, two customers accounted for 22% and 14% of gross accounts receivable. At December 28, 2013, three customers accounted for approximately 21%, 15% and 11% 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.

Goodwill and Intangible Assets

6 Months Ended

Jun. 28, 2014

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets

Goodwill recorded from the acquisition of MicroProbe on October 16, 2012 was $30.7 million as of June 28, 2014 and remained unchanged from the amounts recorded as of December 28, 2013. The Company has not recorded any historical goodwill impairments as of June 28, 2014.

The changes in intangible assets during the six months ended June 28, 2014 and the net book value of intangible assets as of June 28, 2014 and December 28, 2013 were as follows (in thousands):



	Intangible Assets, Gross Amount						Accumulated Amortization						Intangible Assets, Net				Weighted Average Useful Life
Other Intangible Assets (1)	December 28, 2013		Additions/Disposals		June 28, 2014		December 28, 2013		Expense, net		June 28, 2014		December 28, 2013		June 28, 2014		June 28, 2014
Existing developed technologies	$	51,248	$	—	$	51,248	$	18,955	$	8,798	$	27,753	$	32,293	$	23,495	2.0
Trade name	4,388		—		4,388		530		220		750		3,858		3,638		8.3
Customer relationships	17,000		—		17,000		2,581		1,126		3,707		14,419		13,293		6.3
Total finite-lived intangible assets	72,636		—		72,636		22,066		10,144		32,210		50,570		40,426
In-process research and development	6,900		—		6,900		—		—		—		6,900		6,900
Total intangible assets	$	79,536	$	—	$	79,536	$	22,066	$	10,144	$	32,210	$	57,470	$	47,326

(1) Excludes fully amortized intangible assets

The in-process research and development ("IPR&D") assets are classified as indefinite lived intangible assets that 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 Condensed Consolidated Statement of Operations.

For the three and six months ended June 28, 2014, amortization expense of $4.4 million and $0.7 million, and $8.8 million and $1.4 million, respectively, was included in the cost of revenues and selling, and general and administrative expenses. For the three and six months ended June 29, 2013, amortization expense of $3.4 million and $0.8 million, and $7.0 million and $1.5 million, respectively, was included in cost of revenues and selling, general and administrative expenses.

Based on the carrying values of the finite-lived intangible assets recorded as of June 28, 2014 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
2014	$	8,637
2015	12,739
2016	8,720
2017	2,551
2018	2,501
and thereafter	5,278
Total	$	40,426

Restructuring Charges

6 Months Ended

Jun. 28, 2014

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 28, 2014 and June 29, 2013, the purpose of which were to improve operating efficiency, streamline and simplify our operations and reduce our operating costs, are discussed below.

2014 Restructuring Activities

On January 27, 2014, we announced a global organizational restructuring and cost reduction plan (the "Q1 2014 Restructuring Plan"). As part of the plan, the Company eliminated 52 full-time employees. In addition, we reduced our temporary workforce by 9 positions. We recorded $2.0 million of restructuring charges during the first fiscal quarter of fiscal 2014, which was comprised of $1.4 million in severance and related benefits and $0.6 million in impairment charges for certain equipment that would no longer be utilized. During the three months ended June 28, 2014, we eliminated an additional 2 full-time employees and recorded $59 thousand in severance charges.

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 activities comprising these restructuring activities and the related cash payments were completed and paid by June 28, 2014.

2013 Restructuring Activities

In the first quarter of fiscal 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 quarter of fiscal 2013, which was comprised of $1.3 million in severance and related benefits and $2.7 million in impairment charges for certain equipment that would no longer be utilized. In the second quarter of fiscal 2013, we recorded $0.1 million of severance and related benefits due to the reduction of 4 employees across the organization. The activities comprising these restructuring activities were completed in fiscal 2013.

The activities in the restructuring accrual for the six months ended June 28, 2014 were as follows (in thousands):



	Employee Severance and Benefits			Property and Equipment Impairment			Total
Accrual at December 28, 2013	$	138		$	—		$	138
Restructuring charges	1,456			600			2,056
Cash payments	(1,592		)	—			(1,592		)
Asset impairments	—			(600		)	(600		)
Non-cash settlements	(2		)	—			(2		)
Accrual at June 28, 2014	$	—		$	—		$	—

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		)
Adjustment to restructuring charges	(152		)	(5		)	—			(157		)
Other settlements	9			37			(65		)	(19		)
Accrual at June 29, 2013	$	321		$	—		$	—		$	321

Fair Value

6 Months Ended

Jun. 28, 2014

Fair Value Disclosures [Abstract]

Fair Value

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, commercial paper and foreign currency derivatives (see Note 18 to the Condensed Consolidated Financial Statements - Derivative Financial Instruments, for a discussion of fair value of foreign currency derivatives).

Fair value measured on a recurring basis as of June 28, 2014 was as follows (in thousands):



	Level 1		Level 2		Total
Assets:
Cash equivalents
Money market funds	$	33,832	$	—	$	33,832
Commercial paper	—		2,100		2,100
Marketable securities
U.S. Treasuries	—		51,434		51,434
Agency securities (Federal)	—		27,748		27,748
Total	$	33,832	$	81,282	$	115,114

Fair value measured on a recurring basis as of December 28, 2013 was as follows (in thousands):



	Level 1		Level 2		Total
Assets:
Cash equivalents
Money market funds	$	27,943	$	—	$	27,943
Commercial paper	—		11,623		11,623
Marketable securities
U.S. Treasuries	—		49,014		49,014
Agency securities (Federal)	—		31,258		31,258
Total	$	27,943	$	91,895	$	119,838

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 judgment. Broker 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 28, 2014 and June 29, 2013.

Assets Measured at Fair Value on a Non-Recurring Basis

There were no assets measured at fair value on a nonrecurring basis during the three and six months ended June 28, 2014.

- 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 + Details

Marketable Securities

6 Months Ended

Jun. 28, 2014

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 28, 2014 consisted of the following (in thousands):



	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
U.S. Treasuries	$	51,377	$	57	$	—		$	51,434
Agency securities (Federal)	27,748		1		(1		)	27,748
	$	79,125	$	58	$	(1	)	$	79,182

Marketable securities at December 28, 2013 consisted of the following (in thousands):



	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
U.S. Treasuries	$	48,991	$	33	$	(10	)	$	49,014
Commercial paper	11,623		—		—			11,623
Agency securities (Federal)	31,261		1		(4		)	31,258
	$	91,875	$	34	$	(14	)	$	91,895

The marketable securities with gross unrealized losses have been in a loss position for less than twelve months as of June 28, 2014 and December 28, 2013, 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 28, 2014 were as follows (in thousands):



	Amortized Cost		Fair Value
Due in one year or less	$	51,744	$	51,765
Due after one year to five years	27,381		27,417
	$	79,125	$	79,182

Realized gains and losses on sales and maturities of marketable securities were immaterial for the three and six months ended June 28, 2014 and June 29, 2013, respectively.

Allowance for Doubtful Accounts

6 Months Ended

Jun. 28, 2014

Receivables [Abstract]

Allowance for Doubtful Accounts

A reconciliation of the changes in our allowance for doubtful accounts receivable for the six months ended June 28, 2014 and June 29, 2013, respectively, is as follows (in thousands):



	June 28, 2014			June 29, 2013
Balance at beginning of period	$	265		$	290
Additions	5			—
Reductions	(4		)	(19		)
Balance at end of period	$	266		$	271

- 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 + Details

Inventories

6 Months Ended

Jun. 28, 2014

Inventory Disclosure [Abstract]

Inventories

Inventories consisted of the following (in thousands):



	June 28, 2014		December 28, 2013
Raw materials	$	7,695	$	7,411
Work-in-progress	12,088		10,531
Finished goods	2,267		2,765
	$	22,050	$	20,707

Warranty

6 Months Ended

Jun. 28, 2014

Product Warranties Disclosures [Abstract]

Warranty

A reconciliation of the changes in our warranty liability for the six months ended June 28, 2014 and June 29, 2013, respectively, is as follows (in thousands):



	June 28, 2014			June 29, 2013
Balance at beginning of period	$	691		$	734
Accruals	1,260			109
Settlements	(1,066		)	(532		)
Balance at the end of period	$	885		$	311

Long-lived Assets

6 Months Ended

Jun. 28, 2014

Long-Lived Assets Disclosure [Abstract]

Long-lived Assets

Impairment of long-lived assets

During the three months ended June 28, 2014, we did not record any asset impairment charges. During the six months ended June 28, 2014, we recorded $0.7 million of impairments related to manufacturing assets we no longer utilize. During the three and six months ended June 29, 2013, we recorded $0.1 million and $0.2 million, respectively, of impairments related to manufacturing assets we no longer utilize. These charges are included in "Impairments of long-lived assets" in the Condensed Consolidated Statements of Operations in their respective periods.

During the three months ended June 28, 2014, we wrote-off fully depreciated assets with an acquired cost of $0.8 million.

Long-lived Assets

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



	June 28, 2014			December 28, 2013
Building	$	—		$	790
Machinery and equipment	146,343			143,463
Computer equipment and software	34,612			34,547
Capital leases	—			866
Furniture and fixtures	5,513			5,495
Leasehold improvements	67,552			67,384
Sub total	254,020			252,545
Less: accumulated depreciation and amortization	(226,707		)	(221,346		)
Net long-lived assets	27,313			31,199
Construction-in-progress	1,897			3,991
Total	$	29,210		$	35,190

Assets held for sale

During the six months ended June 28, 2014, we reclassified $0.8 million of building and $0.5 million of machinery and equipment from "Property, plant and equipment, net" to "Prepaid expenses and other current assets" in our balance sheet as these assets were identified as held for sale as of June 28, 2014. The sale of the building closed during the third quarter of fiscal 2014 and we will record a gain of $0.2 million on the sale during the third quarter of fiscal 2014.

Refer to Note 4 to the Condensed Consolidated Financial Statements - Goodwill and Intangible Assets for further details relating to our intangible long-lived assets.

Accumulated Other Comprehensive Gain (Loss)

6 Months Ended

Jun. 28, 2014

Other Comprehensive Income (Loss), Net of Tax [Abstract]

Accumulated Other Comprehensive Gain (Loss)

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



	June 28, 2014			December 28, 2013
Unrealized loss on marketable securities, net of tax of $441 at June 28, 2014 and $428 at December 29, 2013, respectively	$	(385	)	$	(409	)
Cumulative translation adjustments	598			160
Accumulated other comprehensive gain (loss)	$	213		$	(249	)

- 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

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-Glossary Reclassification Adjustments
-URI http://asc.fasb.org/extlink&oid=6522872

+ Details

Stockholders' Equity

6 Months Ended

Jun. 28, 2014

Stockholders' Equity Note [Abstract]

Stockholders' Equity

Stockholders’ Equity

Restricted Stock Units

Restricted stock unit activity under our equity incentive plans during the six months ended June 28, 2014 is set forth below:



	Units		Weighted Average Grant Date Fair Value
Restricted stock units at December 28, 2013	2,929,639		$	5.88
Awards granted	1,900,000		6.52
Awards vested	(1,142,158	)	6.40
Awards canceled	(234,981	)	6.00
Restricted stock units at June 28, 2014	3,452,500		$	6.05

On May 5, 2014, we issued 350,000 shares of restricted stock units to seven senior executives 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, 2014 to March 31, 2016 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, 2014. The compensation cost will be recognized ratably over the requisite service period. As of June 28, 2014, 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 28, 2014 and June 29, 2013 was $4.3 million and $7.1 million, and $3.5 million and $5.7 million, respectively.

Stock Options

During the three and six months ended June 28, 2014 and June 29, 2013, we did not grant any stock options.

- Definition

The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.

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+ Details

Stock-Based Compensation

6 Months Ended

Jun. 28, 2014

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 28, 2014		June 29, 2013		June 28, 2014		June 29, 2013
Stock-based compensation included in:
Cost of revenues	$	661	$	638	$	1,155	$	1,162
Research and development	937		841		1,561		1,842
Selling, general and administrative	1,921		1,653		3,373		3,163
Total stock-based compensation	3,519		3,132		6,089		6,167
Tax effect of stock-based compensation	—		—		—		—
Total stock-based compensation, net of tax	$	3,519	$	3,132	$	6,089	$	6,167

Employee Stock Purchase Plan

Under the 2012 Employee Stock Purchase Plan ("ESPP"), 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.

During the three months ended June 28, 2014 and June 29, 2013, we did not issue any ESPP shares. During the six months ended June 28, 2014 and June 29, 2013, we issued 320,919 and 286,928 ESPP 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 28, 2014		June 29, 2013		June 28, 2014		June 29, 2013
ESPP:
Dividend yield	—	%	—	%	—	%	—	%
Expected volatility	42.5	%	38.4	%	40.9	%	40.7	%
Risk-free interest rate	0.07	%	0.11	%	0.11	%	0.15	%
Expected term (in years)	0.50		0.50		1.00		1.00

Unrecognized Compensation Costs

At June 28, 2014, the unrecognized stock-based compensation, adjusted for estimated forfeitures, was as follows (in thousands):



	Unrecognized Expense		Average Expected Recognition Period in years
Stock options	$	336	0.64
Restricted stock units	12,499		1.60
Employee stock purchase plan	65		0.09
Total unrecognized stock-based compensation expense	$	12,900

Net Loss per Share

6 Months Ended

Jun. 28, 2014

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 net loss per share for the three and six months ended June 28, 2014 and June 29, 2013, 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 28, 2014			June 29, 2013			June 28, 2014			June 29, 2013
Numerator:
Net loss used in computing basic and diluted net loss per share	$	(4,326	)	$	(8,407	)	$	(17,037	)	$	(28,180	)
Denominator:
Weighted-average shares used in computing basic net loss per share	55,812			54,105			55,431			53,886
Add potentially dilutive securities	—			—			—			—
Weighted-average shares used in computing basic and diluted net loss per share	55,812			54,105			55,431			53,886

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 28, 2014	June 29, 2013	June 28, 2014	June 29, 2013
Options to purchase common stock	2,981	3,970	3,133	4,075
Restricted stock units	—	523	3	622
Employee stock purchase plan	26	31	16	18
Total potentially dilutive securities	3,007	4,524	3,152	4,715

Income Taxes	6 Months Ended
Income Taxes	Jun. 28, 2014
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes We recorded an income tax benefit of $51 thousand and a tax provision $0.3 million for the three and six months ended June 28, 2014, respectively, and an income tax provision of $0.2 million and a tax benefit of $5 thousand, respectively, for the three and six months ended June 29, 2013. Income tax provisions reflect the tax provision on our operations in the US and foreign jurisdictions and the tax benefit from the lapsing of the statute of limitations in foreign jurisdictions. We continue to maintain a valuation allowance for our U.S. Federal and state deferred tax assets.

Commitments and Contingencies	6 Months Ended
Commitments and Contingencies	Jun. 28, 2014
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. Purchase obligations are primarily for purchases of inventory and manufacturing related service contracts. 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 28, 2014 from those disclosed in our Annual Report on Form 10-K for the fiscal year ended December 28, 2013. 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 during the six months ended June 28, 2014, or in our fiscal 2013. We do not believe that any loss from environmental remediation liabilities would be in an amount material to our financial statements. 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 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, amended enforcement practices around 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 on our consolidated balance sheet as of June 28, 2014. 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 28, 2014, we were not involved in any material legal proceedings. We identify below in "Other Litigation", a proceeding filed in fiscal 2013, which, if not resolved amicably, either (i) includes allegations that could potentially result in a material legal proceeding, or (ii) the cost to defend the allegations through trial could be material. 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. Litigation can be expensive and disruptive to normal business operations. Moreover, the results of legal proceedings are difficult to predict, and the costs incurred in litigation can be substantial, regardless of outcome. 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 six months ended June 28, 2014, 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, currently is, and may in the future be, involved in commercial litigation relating to intellectual property, as well as third party initiated patent office proceedings in the United States and foreign patent offices. 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 28, 2014. We could incur material attorneys' fees in prosecuting and defending actions related to intellectual property. Other Litigation In August 2013, a former employee (“Plaintiff”) filed a class action lawsuit against the Company in the Superior Court of California, alleging violations of California’s wage and hour laws and unfair business practices on behalf of himself and all other similarly situated current and former employees at the Company’s Livermore facilities from August 21, 2009 to the present. In February 2014, the Court granted the Company’s motion to strike portions of Plaintiff’s first amended complaint, clarifying the scope of the putative class. A second amended complaint has also been filed. Procedurally, the case is in the early stages of litigation and no defined class has been certified. The parties participated in a mediation during the third quarter of fiscal 2014, which did not result in a settlement. The Company currently believes that any settlement reached would be in an amount that is not material to the Company's financial statements. The Company denies the allegations contained in the lawsuit and based on available information, believes it has significant defenses to the allegations of the lawsuit. If the matter is not settled, the Company could incur material attorneys’ fees in defending the lawsuit.

Derivative Financial Instruments

6 Months Ended

Jun. 28, 2014

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 28, 2014 (in thousands):



Currency	Contract Position	Contract Amount (Local Currency)		Contract Amount (U.S. Dollars)
Japanese Yen	Sell	1,013,703		$	9,987
Taiwan Dollar	Buy	(23,963	)	(805		)
Korean Won	Buy	1,155,279		(1,143		)
Total USD notional amount of outstanding foreign exchange contracts				$	8,039

The contracts were entered into on June 27, 2014 and matured on July 25, 2014. 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 28, 2014. Additionally, no gains or losses relating to the outstanding derivative contracts were recorded in the three and six months ended June 28, 2014.

The location and amount of gains and losses related to non-designated derivative instruments that matured in the three and six months ended June 28, 2014 and June 29, 2013 in the Condensed Consolidated Statement of Operations are as follows (in thousands):



		Amount of Loss Recognized on Derivatives
		Three Months Ended						Six Months Ended
Derivatives Not Designated as Hedging Instruments	Location of Loss Recognized on Derivatives	June 28, 2014			June 29, 2013				June 28, 2014			June 29, 2013
Foreign exchange forward contracts	Other income (expense), net	$	(101	)	$	(23	)		$	(275	)	$	(251	)

- Definition

The entire disclosure for derivative instruments and hedging activities including, but not limited to, risk management strategies, non-hedging derivative instruments, assets, liabilities, revenue and expenses, and methodologies and assumptions used in determining the amounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6441202&loc=d3e80720-113993

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=35706170&loc=d3e41620-113959

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624163-113959

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5579240-113959

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4D
-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624177-113959

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80784-113994

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=35706170&loc=d3e41641-113959

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5579245-113959

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4H
-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624258-113959

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4K
-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5708775-113959

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4J
-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5708773-113959

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5618551-113959

Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5580258-113959

Reference 16: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4E
-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624181-113959

Reference 17: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 25
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986

Reference 18: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=35706170&loc=d3e41638-113959

Reference 19: 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.(n))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

Basis of Presentation and Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 28, 2014
Organization, Consolidation and Presentation of Financial Statements [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 2014 and 2013 each contain 52 weeks and the three and six months ended June 28, 2014 and June 29, 2013 each contained 13 and 26 weeks, respectively. Fiscal 2014 will end on December 27, 2014.
Fair Value Measurement, Policy	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, commercial paper and foreign currency derivatives (see Note 18 to the Condensed Consolidated Financial Statements - Derivative Financial Instruments, for a discussion of fair value of foreign currency derivatives)

- 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

Goodwill and Intangible Assets (Tables)

6 Months Ended

Jun. 28, 2014

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Finite-Lived Intangible Assets

The changes in intangible assets during the six months ended June 28, 2014 and the net book value of intangible assets as of June 28, 2014 and December 28, 2013 were as follows (in thousands):



	Intangible Assets, Gross Amount						Accumulated Amortization						Intangible Assets, Net				Weighted Average Useful Life
Other Intangible Assets (1)	December 28, 2013		Additions/Disposals		June 28, 2014		December 28, 2013		Expense, net		June 28, 2014		December 28, 2013		June 28, 2014		June 28, 2014
Existing developed technologies	$	51,248	$	—	$	51,248	$	18,955	$	8,798	$	27,753	$	32,293	$	23,495	2.0
Trade name	4,388		—		4,388		530		220		750		3,858		3,638		8.3
Customer relationships	17,000		—		17,000		2,581		1,126		3,707		14,419		13,293		6.3
Total finite-lived intangible assets	72,636		—		72,636		22,066		10,144		32,210		50,570		40,426
In-process research and development	6,900		—		6,900		—		—		—		6,900		6,900
Total intangible assets	$	79,536	$	—	$	79,536	$	22,066	$	10,144	$	32,210	$	57,470	$	47,326

(1) Excludes fully amortized intangible assets

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense



Fiscal Year	Amount
2014	$	8,637
2015	12,739
2016	8,720
2017	2,551
2018	2,501
and thereafter	5,278
Total	$	40,426

Restructuring Charges (Tables)

6 Months Ended

Jun. 28, 2014

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 28, 2014 were as follows (in thousands):



	Employee Severance and Benefits			Property and Equipment Impairment			Total
Accrual at December 28, 2013	$	138		$	—		$	138
Restructuring charges	1,456			600			2,056
Cash payments	(1,592		)	—			(1,592		)
Asset impairments	—			(600		)	(600		)
Non-cash settlements	(2		)	—			(2		)
Accrual at June 28, 2014	$	—		$	—		$	—

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		)
Adjustment 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. 28, 2014

Fair Value Disclosures [Abstract]

Fair Value, Assets Measured on Recurring Basis

Fair value measured on a recurring basis as of June 28, 2014 was as follows (in thousands):



	Level 1		Level 2		Total
Assets:
Cash equivalents
Money market funds	$	33,832	$	—	$	33,832
Commercial paper	—		2,100		2,100
Marketable securities
U.S. Treasuries	—		51,434		51,434
Agency securities (Federal)	—		27,748		27,748
Total	$	33,832	$	81,282	$	115,114

Fair value measured on a recurring basis as of December 28, 2013 was as follows (in thousands):



	Level 1		Level 2		Total
Assets:
Cash equivalents
Money market funds	$	27,943	$	—	$	27,943
Commercial paper	—		11,623		11,623
Marketable securities
U.S. Treasuries	—		49,014		49,014
Agency securities (Federal)	—		31,258		31,258
Total	$	27,943	$	91,895	$	119,838

Marketable Securities (Tables)

6 Months Ended

Jun. 28, 2014

Investments, Debt and Equity Securities [Abstract]

Schedule of Available-for-sale Securities Reconciliation

Marketable securities at June 28, 2014 consisted of the following (in thousands):



	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
U.S. Treasuries	$	51,377	$	57	$	—		$	51,434
Agency securities (Federal)	27,748		1		(1		)	27,748
	$	79,125	$	58	$	(1	)	$	79,182

Marketable securities at December 28, 2013 consisted of the following (in thousands):



	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
U.S. Treasuries	$	48,991	$	33	$	(10	)	$	49,014
Commercial paper	11,623		—		—			11,623
Agency securities (Federal)	31,261		1		(4		)	31,258
	$	91,875	$	34	$	(14	)	$	91,895

Investments Classified by Contractual Maturity Date

Contractual maturities of marketable securities as of June 28, 2014 were as follows (in thousands):



	Amortized Cost		Fair Value
Due in one year or less	$	51,744	$	51,765
Due after one year to five years	27,381		27,417
	$	79,125	$	79,182

Allowance for Doubtful Accounts (Tables)

6 Months Ended

Jun. 28, 2014

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 28, 2014 and June 29, 2013, respectively, is as follows (in thousands):



	June 28, 2014			June 29, 2013
Balance at beginning of period	$	265		$	290
Additions	5			—
Reductions	(4		)	(19		)
Balance at end of period	$	266		$	271

Inventory (Tables)

6 Months Ended

Jun. 28, 2014

Inventory Disclosure [Abstract]

Schedule of Inventory, Current

Inventories consisted of the following (in thousands):



	June 28, 2014		December 28, 2013
Raw materials	$	7,695	$	7,411
Work-in-progress	12,088		10,531
Finished goods	2,267		2,765
	$	22,050	$	20,707

Warranty (Tables)

6 Months Ended

Jun. 28, 2014

Product Warranties Disclosures [Abstract]

Schedule of Product Warranty Liability

A reconciliation of the changes in our warranty liability for the six months ended June 28, 2014 and June 29, 2013, respectively, is as follows (in thousands):



	June 28, 2014			June 29, 2013
Balance at beginning of period	$	691		$	734
Accruals	1,260			109
Settlements	(1,066		)	(532		)
Balance at the end of period	$	885		$	311

Long-lived Assets (Tables)

6 Months Ended

Jun. 28, 2014

Long-Lived Assets Disclosure [Abstract]

Property, plant and equipment Including Construction-in-progress

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



	June 28, 2014			December 28, 2013
Building	$	—		$	790
Machinery and equipment	146,343			143,463
Computer equipment and software	34,612			34,547
Capital leases	—			866
Furniture and fixtures	5,513			5,495
Leasehold improvements	67,552			67,384
Sub total	254,020			252,545
Less: accumulated depreciation and amortization	(226,707		)	(221,346		)
Net long-lived assets	27,313			31,199
Construction-in-progress	1,897			3,991
Total	$	29,210		$	35,190

Accumulated Other Comprehensive Gain (Loss) (Tables)

6 Months Ended

Jun. 28, 2014

Other Comprehensive Income (Loss), Net of Tax [Abstract]

Schedule of Accumulated Other Comprehensive Income (Loss)



	June 28, 2014			December 28, 2013
Unrealized loss on marketable securities, net of tax of $441 at June 28, 2014 and $428 at December 29, 2013, respectively	$	(385	)	$	(409	)
Cumulative translation adjustments	598			160
Accumulated other comprehensive gain (loss)	$	213		$	(249	)

Stockholders' Equity (Tables)

6 Months Ended

Jun. 28, 2014

Stockholders' Equity Note [Abstract]

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 28, 2014 is set forth below:



	Units		Weighted Average Grant Date Fair Value
Restricted stock units at December 28, 2013	2,929,639		$	5.88
Awards granted	1,900,000		6.52
Awards vested	(1,142,158	)	6.40
Awards canceled	(234,981	)	6.00
Restricted stock units at June 28, 2014	3,452,500		$	6.05

Stock-Based Compensation (Tables)

6 Months Ended

Jun. 28, 2014

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 28, 2014		June 29, 2013		June 28, 2014		June 29, 2013
Stock-based compensation included in:
Cost of revenues	$	661	$	638	$	1,155	$	1,162
Research and development	937		841		1,561		1,842
Selling, general and administrative	1,921		1,653		3,373		3,163
Total stock-based compensation	3,519		3,132		6,089		6,167
Tax effect of stock-based compensation	—		—		—		—
Total stock-based compensation, net of tax	$	3,519	$	3,132	$	6,089	$	6,167

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 28, 2014		June 29, 2013		June 28, 2014		June 29, 2013
ESPP:
Dividend yield	—	%	—	%	—	%	—	%
Expected volatility	42.5	%	38.4	%	40.9	%	40.7	%
Risk-free interest rate	0.07	%	0.11	%	0.11	%	0.15	%
Expected term (in years)	0.50		0.50		1.00		1.00

Schedule of Unrecognized Compensation Cost, Nonvested Awards

At June 28, 2014, the unrecognized stock-based compensation, adjusted for estimated forfeitures, was as follows (in thousands):



	Unrecognized Expense		Average Expected Recognition Period in years
Stock options	$	336	0.64
Restricted stock units	12,499		1.60
Employee stock purchase plan	65		0.09
Total unrecognized stock-based compensation expense	$	12,900

Net Loss per Share (Tables)

6 Months Ended

Jun. 28, 2014

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 28, 2014			June 29, 2013			June 28, 2014			June 29, 2013
Numerator:
Net loss used in computing basic and diluted net loss per share	$	(4,326	)	$	(8,407	)	$	(17,037	)	$	(28,180	)
Denominator:
Weighted-average shares used in computing basic net loss per share	55,812			54,105			55,431			53,886
Add potentially dilutive securities	—			—			—			—
Weighted-average shares used in computing basic and diluted net loss per share	55,812			54,105			55,431			53,886

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share



	Three Months Ended		Six Months Ended
	June 28, 2014	June 29, 2013	June 28, 2014	June 29, 2013
Options to purchase common stock	2,981	3,970	3,133	4,075
Restricted stock units	—	523	3	622
Employee stock purchase plan	26	31	16	18
Total potentially dilutive securities	3,007	4,524	3,152	4,715

Derivative Financial Instruments (Tables)

6 Months Ended

Jun. 28, 2014

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 28, 2014 (in thousands):



Currency	Contract Position	Contract Amount (Local Currency)		Contract Amount (U.S. Dollars)
Japanese Yen	Sell	1,013,703		$	9,987
Taiwan Dollar	Buy	(23,963	)	(805		)
Korean Won	Buy	1,155,279		(1,143		)
Total USD notional amount of outstanding foreign exchange contracts				$	8,039

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



		Amount of Loss Recognized on Derivatives
		Three Months Ended						Six Months Ended
Derivatives Not Designated as Hedging Instruments	Location of Loss Recognized on Derivatives	June 28, 2014			June 29, 2013				June 28, 2014			June 29, 2013
Foreign exchange forward contracts	Other income (expense), net	$	(101	)	$	(23	)		$	(275	)	$	(251	)

Basis of Presentation and Summary of Significant Accounting Policies (Details)	6 Months Ended
	Jun. 28, 2014
Significant Accounting Policies [Line Items]
Number of Weeks for Year End	P52W
Minimum
Significant Accounting Policies [Line Items]
Number of Weeks for Year End	P52W
Maximum
Significant Accounting Policies [Line Items]
Number of Weeks for Year End	P53W

Concentration of Credit and Other Risks (Details) - Customer Concentration Risk - Customer	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 28, 2014	Jun. 29, 2013	Jun. 28, 2014	Jun. 29, 2013	Dec. 28, 2013
Sales Revenue, Goods, Net
Concentration Risk [Line Items]
Concentration Risk, Percentage	53.10%	34.70%	51.00%	35.80%
Sales Revenue, Goods, Net \| SK Hynix
Concentration Risk [Line Items]
Concentration Risk, Percentage	21.40%	20.10%	19.50%	19.70%
Sales Revenue, Goods, Net \| Intel
Concentration Risk [Line Items]
Concentration Risk, Percentage	19.50%	14.60%	18.00%	16.10%
Sales Revenue, Goods, Net \| Micron
Concentration Risk [Line Items]
Concentration Risk, Percentage	12.20%		13.50%
Accounts Receivable
Concentration Risk [Line Items]
Concentration Risk, Number of Customers			2		3
Accounts Receivable \| Major Customer 1
Concentration Risk [Line Items]
Concentration Risk, Percentage			14.00%		21.00%
Accounts Receivable \| Major Customer 2
Concentration Risk [Line Items]
Concentration Risk, Percentage			22.00%		15.00%
Accounts Receivable \| Major Customer 3
Concentration Risk [Line Items]
Concentration Risk, Percentage					11.00%

Goodwill and Intangible Assets - Goodwill (Details) $ in Thousands	Jun. 28, 2014 USD ($)
Goodwill [Roll Forward]
Goodwill	$ 30,731

Goodwill and Intangible Assets - Finite-Lived (Details) $ in Thousands	6 Months Ended
	Jun. 28, 2014 USD ($)	Dec. 28, 2013 USD ($)
Finite-lived Intangible Assets [Roll Forward]
Intangible Assets, Gross Amount	$ 72,636
Additions/Disposals	0
Intangible Assets, Gross Amount	72,636
Accumulated Amortization	22,066
Expense, net	10,144
Accumulated Amortization	32,210
Intangible Assets, Net	40,426	$ 50,570
Intangible Assets Net Excluding Goodwill [Roll Forward]
Intangible Assets Net Excluding Goodwill Gross	79,536
Intangible Assets Net Excluding Goodwill Acquired During Period	0
Intangible Assets Net Excluding Goodwill Gross	79,536
Intangible Assets, Net (Excluding Goodwill)	47,326	57,470
Existing developed technologies
Finite-lived Intangible Assets [Roll Forward]
Intangible Assets, Gross Amount	51,248
Additions/Disposals	0
Intangible Assets, Gross Amount	51,248
Accumulated Amortization	18,955
Expense, net	8,798
Accumulated Amortization	27,753
Intangible Assets, Net	$ 23,495	32,293
Weighted Average Useful Life	2 years 6 days
Trade name
Finite-lived Intangible Assets [Roll Forward]
Intangible Assets, Gross Amount	$ 4,388
Additions/Disposals	0
Intangible Assets, Gross Amount	4,388
Accumulated Amortization	530
Expense, net	220
Accumulated Amortization	750
Intangible Assets, Net	$ 3,638	3,858
Weighted Average Useful Life	8 years 3 months 6 days
Customer relationships
Finite-lived Intangible Assets [Roll Forward]
Intangible Assets, Gross Amount	$ 17,000
Intangible Assets, Gross Amount	17,000
Accumulated Amortization	2,581
Expense, net	1,126
Accumulated Amortization	3,707
Intangible Assets, Net	$ 13,293	$ 14,419
Weighted Average Useful Life	6 years 3 months 6 days
In-process research and development
Indefinite-lived Intangible Assets [Roll Forward]
Beginning Balance	$ 6,900
Indefinite-lived Intangible Assets, Acquired During Period	0
Ending Balance	$ 6,900

Goodwill and Intangible Assets - Amortization (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2014	Sep. 28, 2013	Jun. 28, 2014	Jun. 29, 2013	Dec. 28, 2013
Property, Plant and Equipment [Line Items]
Amortization of Intangible Assets			$ 10,144
Finite-Lived Intangible Assets, Net, Amortization Expense, Rolling Maturity [Abstract]
2014	$ 8,637		8,637
2015	12,739		12,739
2016	8,720		8,720
2017	2,551		2,551
2018	2,501		2,501
and thereafter	5,278		5,278
Intangible Assets, Net	40,426		40,426		$ 50,570
Cost of Sales \| Intellectual Property
Property, Plant and Equipment [Line Items]
Amortization of Intangible Assets	4,400	$ 3,400	8,800	$ 7,000
Selling, general and administrative \| Intellectual Property
Property, Plant and Equipment [Line Items]
Amortization of Intangible Assets	$ 700	$ 800	$ 1,400	$ 1,500

Restructuring Charges (Narrative) (Details) $ in Thousands	3 Months Ended				6 Months Ended
Restructuring Charges (Narrative) (Details) $ in Thousands	Jun. 28, 2014 USD ($) Employee	Mar. 29, 2014 USD ($) Employee positions	Jun. 29, 2013 USD ($) Employee positions	Mar. 30, 2013 USD ($)	Jun. 28, 2014 USD ($)	Jun. 29, 2013 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 59		$ 92		$ 2,056	$ 4,072
Q1 2014 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Number of employees eliminated \| Employee	2	52
Number of temporary positions eliminated \| positions		9
Restructuring charges		$ 2,000
Q1 2014 Restructuring Plan \| Employee Severance and Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 59	1,400
Q1 2014 Restructuring Plan \| Property and Equipment Impairment
Restructuring Cost and Reserve [Line Items]
Asset impairments		$ 600
Q1 2013 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Number of employees eliminated \| Employee			31
Number of temporary positions eliminated \| positions			20
Restructuring charges			$ 4,000
Q1 2013 Restructuring Plan \| Employee Severance and Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges			$ 1,300
Q1 2013 Restructuring Plan \| Property and Equipment Impairment
Restructuring Cost and Reserve [Line Items]
Number of employees eliminated \| Employee			4
Asset impairments			$ 100	$ 2,700

Restructuring Charges Activities (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 28, 2014	Jun. 29, 2013
Restructuring Reserve [Roll Forward]
Accrual at beginning of period	$ 138	$ 616
Restructuring charges	2,056	4,225
Cash payments	(1,592)	(1,601)
Asset Impairment Charges	(600)
Restructuring Reserve, Settled without Cash	(2)
Adjustment to restructuring charges		(157)
Accrual at end of period	0	321
Employee Severance and Benefits
Restructuring Reserve [Roll Forward]
Accrual at beginning of period	138	548
Restructuring charges	1,456	1,468
Cash payments	(1,592)	(1,552)
Asset Impairment Charges	0
Restructuring Reserve, Settled without Cash	(2)
Adjustment to restructuring charges		(152)
Accrual at end of period	0	321
Property and Equipment Impairment
Restructuring Reserve [Roll Forward]
Accrual at beginning of period	0	0
Restructuring charges	600	2,743
Cash payments	0	(32)
Asset Impairment Charges	(600)
Restructuring Reserve, Settled without Cash
Adjustment to restructuring charges		(5)
Accrual at end of period	$ 0	0
Contract Termination and Other Costs
Restructuring Reserve [Roll Forward]
Accrual at beginning of period		68
Restructuring charges		14
Cash payments		(17)
Adjustment to restructuring charges		0
Accrual at end of period		0
2013 Restructuring Plan [Member] \| Employee Severance and Benefits
Restructuring Reserve [Roll Forward]
Asset Impairment Charges		0
Non-cash settlements		9
2013 Restructuring Plan [Member] \| Property and Equipment Impairment
Restructuring Reserve [Roll Forward]
Asset Impairment Charges		(2,743)
Non-cash settlements		37
2013 Restructuring Plan [Member] \| Contract Termination and Other Costs
Restructuring Reserve [Roll Forward]
Asset Impairment Charges		0
Non-cash settlements		(65)
2013 Restructuring Plan [Member] \| Total [Member]
Restructuring Reserve [Roll Forward]
Asset Impairment Charges		(2,743)
Non-cash settlements		$ (19)

Fair Value (Details) - USD ($) $ in Thousands	Jun. 28, 2014	Dec. 28, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable securities	$ 79,182	$ 91,895
Total	115,114	119,838
Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total	33,832	27,943
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total	81,282	91,895
Money market funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	33,832	27,943
Money market funds \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	33,832	27,943
Money market funds \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	0	0
Commercial paper
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	2,100	11,623
Commercial paper \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	0	0
Commercial paper \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	2,100	11,623
U.S. Treasuries
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable securities	51,434	49,014
U.S. Treasuries \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable securities	0	0
U.S. Treasuries \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable securities	51,434	49,014
Agency securities (Federal)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable securities	27,748	31,258
Agency securities (Federal) \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable securities	0	0
Agency securities (Federal) \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable securities	$ 27,748	$ 31,258

Marketable Securities (Details) - USD ($) $ in Thousands	Jun. 28, 2014	Dec. 28, 2013
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 79,125	$ 91,875
Gross Unrealized Gains	58	34
Gross Unrealized Losses	(1)	(14)
Fair Value	79,182	91,895
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Due in one year or less, Amortized Cost	51,744
Due after one year to five years, Amortized Cost	27,381
Amortized Cost	79,125
Available-for-sale Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]
Due in one year or less, Fair Value	51,765
Due after one year to five years, Fair Value	27,417
Fair Value	79,182
U.S. Treasuries
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	51,377	48,991
Gross Unrealized Gains	57	33
Gross Unrealized Losses	0	(10)
Fair Value	51,434	49,014
Agency securities (Federal)
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	27,748	31,261
Gross Unrealized Gains	1	1
Gross Unrealized Losses	(1)	(4)
Fair Value	$ 27,748	31,258
Commercial paper
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		11,623
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Fair Value		$ 11,623

Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 28, 2014	Jun. 29, 2013
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance at beginning of period		$ 290
Additions	$ 5	0
Reductions	4	19
Balance at end of period	$ 266	$ 271

Inventories (Details) - USD ($) $ in Thousands	Jun. 28, 2014	Dec. 28, 2013
Inventory Disclosure [Abstract]
Raw materials	$ 7,695	$ 7,411
Work-in-progress	12,088	10,531
Finished goods	2,267	2,765
Inventory, Net	$ 22,050	$ 20,707

Warranty (Details) - USD ($) $ in Thousands	6 Months Ended
Warranty (Details) - USD ($) $ in Thousands	Jun. 28, 2014	Jun. 29, 2013
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]
Beginning balance	$ 691	$ 734
Accruals	1,260	109
Settlements	(1,066)	(532)
Ending balance	$ 885	$ 311

Long-lived Assets Long-lived Assets (Narrative) (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	Aug. 01, 2014	Jun. 28, 2014	Jun. 29, 2013	Jun. 28, 2014	Jun. 29, 2013
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment of Long-Lived Assets to be Disposed of		$ 0	$ 121	$ 743	$ 179
Gain on sale		$ 0	(300)	0	(300)
Building
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment of Long-Lived Assets to be Disposed of				800
Machinery and equipment
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment of Long-Lived Assets to be Disposed of			$ 58	$ 500	$ 200
Subsequent Event \| Building
Impaired Long-Lived Assets Held and Used [Line Items]
Gain on sale	$ 200

Long-lived Assets (Details) - USD ($) $ in Thousands	Jun. 28, 2014	Dec. 28, 2013
Property, Plant and Equipment [Line Items]
Property Plant And Equipment Net, Excludes Construction in Progress Gross	$ 254,020	$ 252,545
Less: accumulated depreciation and amortization	(226,707)	(221,346)
Net long-lived assets	27,313	31,199
Construction-in-progress	1,897	3,991
Total	29,210	35,190
Building
Property, Plant and Equipment [Line Items]
Property Plant And Equipment Net, Excludes Construction in Progress Gross	0	790
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property Plant And Equipment Net, Excludes Construction in Progress Gross	146,343	143,463
Computer equipment and software
Property, Plant and Equipment [Line Items]
Property Plant And Equipment Net, Excludes Construction in Progress Gross	34,612	34,547
Capital leases
Property, Plant and Equipment [Line Items]
Property Plant And Equipment Net, Excludes Construction in Progress Gross	0	866
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property Plant And Equipment Net, Excludes Construction in Progress Gross	5,513	5,495
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property Plant And Equipment Net, Excludes Construction in Progress Gross	$ 67,552	$ 67,384

Accumulated Other Comprehensive Gain (Loss) (Details) - USD ($) $ in Thousands	Jun. 28, 2014	Dec. 28, 2013
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Unrealized loss on marketable securities, net of tax of $441 at June 28, 2014 and $428 at December 29, 2013, respectively	$ (385)	$ (409)
Cumulative translation adjustments	598	160
Accumulated other comprehensive gain (loss)	213	(249)
Other Comprehensive Income (Loss), Available-for-sale Securities, Tax	$ 441	$ 428

- 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 + Details

Restricted Stock Units (Details) $ / shares in Units, $ in Thousands		3 Months Ended					6 Months Ended
	May 05, 2014 shares	Jun. 28, 2014 USD ($) $ / shares shares	Mar. 29, 2014 USD ($) $ / shares shares	Sep. 28, 2013 USD ($)	Jun. 29, 2013 USD ($)	Mar. 30, 2013 USD ($)	Jun. 28, 2014 USD ($) $ / shares shares	Jun. 29, 2013 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense \| $		$ 3,519			$ 3,132		$ 6,089	$ 6,167
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Issued During Period, Shares, New Issues	350,000
Stock Issued During Period, Shares, New Issues, Number of Recipients	7
Stock-based compensation expense \| $							$ 100
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 \| $		$ 4,300	$ 7,100
Equity Incentive Plan \| Restricted Stock Units
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			2,929,639				2,929,639
Awards granted							1,900,000
Awards released							(1,142,158)
Awards canceled							(234,981)
Non-vested restricted stock units		3,452,500					3,452,500
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 \| $ / shares			$ 5.88				$ 5.88
Weighted Average Awards Granted fair value \| $ / shares							6.52
Weighted Average Awards released fair value \| $ / shares							6.40
Weighted Average Awards canceled fair value \| $ / shares							6.00
Weighted Average Exercise Price Non-vested restricted stock units \| $ / shares		$ 6.05					$ 6.05
Total fair value of restricted stock units vested during the period \| $				$ 3,500		$ 5,700

Stock-Based Compensation Included in Condensed Consolidated Statement of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2014	Jun. 29, 2013	Jun. 28, 2014	Jun. 29, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation	$ 3,519	$ 3,132	$ 6,089	$ 6,167
Tax effect of stock-based compensation	0	0	0	0
Total stock-based compensation, net of tax	3,519	3,132	6,089	6,167
Cost of revenues
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation	661	638	1,155	1,162
Research and development
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation	937	841	1,561	1,842
Selling, general and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation	$ 1,921	$ 1,653	$ 3,373	$ 3,163

Stock-Based Compensation (Narrative) (Details) - shares	3 Months Ended
Stock-Based Compensation (Narrative) (Details) - shares	Jun. 28, 2014	Sep. 28, 2013
Employee stock purchase plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Issued During Period, Shares, Employee Stock Purchase Plans	320,919	286,928

Stock-Based Compensation Weighted Average Assumptions (Details) - Employee stock purchase plan	3 Months Ended		6 Months Ended
	Jun. 28, 2014	Jun. 29, 2013	Jun. 28, 2014	Jun. 29, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield	0.00%	0.00%	0.00%	0.00%
Expected volatility	42.50%	38.40%	40.90%	40.70%
Risk-free interest rate	0.07%	0.11%	0.11%	0.15%
Expected term (in years)	6 months	6 months	1 year	1 year

Stock-Based Compensation Unrecognized Compensation Costs (Details) $ in Thousands	6 Months Ended
	Jun. 28, 2014 USD ($)
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized [Abstract]
Total unrecognized stock-based compensation expense	$ 12,900
Stock options
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	$ 336
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	7 months 22 days
Restricted stock units
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	$ 12,499
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	1 year 7 months 6 days
Employee stock purchase plan
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	$ 65
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	1 month 4 days

Net Loss per Share (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2014	Jun. 29, 2013	Jun. 28, 2014	Jun. 29, 2013
Numerator [Abstract]
Net loss used in computing basic and diluted net loss per share	$ (4,326)	$ (8,407)	$ (17,037)	$ (28,180)
Denominator [Abstract]
Weighted-average shares used in computing basic net loss per share	55,812	54,105	55,431	53,886
Add potentially dilutive securities	0	0	0	0
Weighted-average shares used in computing basic and diluted net loss per share	55,812	54,105	55,431	53,886

- Definition

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

+ References + Details

Net Loss Per Share Weighted-Average Dilutive Securities (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2014	Jun. 29, 2013	Jun. 28, 2014	Jun. 29, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potentially dilutive securities	3,007	4,524	3,152	4,715
Options to purchase common stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potentially dilutive securities	2,981	3,970	3,133	4,075
Restricted stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potentially dilutive securities	0	523	3	622
Employee stock purchase plan
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potentially dilutive securities	26	31	16	18

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Income Taxes (Details) - USD ($) $ in Thousands	Jun. 28, 2014	Jun. 29, 2013	Jun. 28, 2014	Jun. 29, 2013
Income Tax Disclosure [Abstract]
Income tax benefit	$ (51)	$ 202	$ 257	$ (5)

Derivative Financial Instruments (Details) - Not Designated as Hedging Instrument - Foreign Exchange Forward ₩ in Thousands, ¥ in Thousands, $ in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2014 USD ($)	Jun. 29, 2013 USD ($)	Jun. 28, 2014 USD ($)	Jun. 29, 2013 USD ($)	Jun. 28, 2014 JPY (¥)	Jun. 28, 2014 KRW (₩)	Jun. 28, 2014 TWD ($)	Jun. 28, 2014 USD ($)
Derivatives, Fair Value [Line Items]
Derivative Asset, Notional Amount								$ (8,039)
Other Income, Net
Derivatives, Fair Value [Line Items]
Foreign exchange forward contracts	$ (101)	$ (23)	$ (275)	$ (251)
Japanese Yen
Derivatives, Fair Value [Line Items]
Derivative Asset, Notional Amount					¥ (1,013,703)			(9,987)
Taiwan Dollar
Derivatives, Fair Value [Line Items]
Derivative Asset, Notional Amount							$ (23,963)	(805)
Korean Won
Derivatives, Fair Value [Line Items]
Derivative Asset, Notional Amount						₩ 1,155,279		$ (1,143)

Label	Element	Value
Allowance for Doubtful Accounts Receivable	us-gaap_AllowanceForDoubtfulAccountsReceivable	$ 265,000