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Document and Entity Information - shares	6 Months Ended
Document and Entity Information - shares	Jun. 25, 2016	Aug. 02, 2016
Document and Entity Information [Abstract]
Entity Registrant Name	FORMFACTOR INC.
Entity Central Index Key	0001039399
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Document Type	10-Q
Document Period End Date	Jun. 25, 2016
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Common Stock, Shares Outstanding		70,565,320

Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 25, 2016	Jun. 27, 2015	Jun. 25, 2016	Jun. 27, 2015
Income Statement [Abstract]
Revenues	$ 83,083	$ 73,885	$ 136,694	$ 144,714
Cost of revenues	57,656	50,582	101,475	98,621
Gross profit	25,427	23,303	35,219	46,093
Operating expenses:
Research and development	11,133	11,217	21,982	22,302
Selling, general and administrative	14,030	11,381	26,546	23,265
Restructuring charges, net	6,910	0	6,910	503
Impairment of long-lived assets	0	8	0	8
Total operating expenses	32,073	22,606	55,438	46,078
Operating income (loss)	(6,646)	697	(20,219)	15
Interest income, net	88	65	205	149
Other income (expense), net	(302)	100	(616)	1,602
Income (loss) before income taxes	(6,860)	862	(20,630)	1,766
Provision (benefit) for income taxes	(43,744)	24	(43,714)	145
Net income	$ 36,884	$ 838	$ 23,084	$ 1,621
Net income per share:
Basic (In dollars per share)	$ 0.62	$ 0.01	$ 0.39	$ 0.03
Diluted (In dollars per share)	$ 0.61	$ 0.01	$ 0.39	$ 0.03
Weighted-average number of shares used in per share calculations:
Basic (In shares)	59,572	58,109	59,001	57,532
Diluted (In shares)	59,988	59,094	59,639	58,874

Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 25, 2016	Jun. 27, 2015	Jun. 25, 2016	Jun. 27, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 36,884	$ 838	$ 23,084	$ 1,621
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	916	(302)	1,519	(248)
Unrealized gains on available-for-sale marketable securities	3	1	41	11
Other comprehensive income (loss), net of tax	919	(301)	1,560	(237)
Comprehensive income	$ 37,803	$ 537	$ 24,644	$ 1,384

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 25, 2016	Dec. 26, 2015
Current assets:
Cash and cash equivalents	$ 100,225	$ 146,264
Marketable securities	18,108	41,325
Accounts receivable, net	86,137	36,725
Inventories, net	68,357	27,223
Refundable income taxes	1,517	0
Prepaid expenses and other current assets	10,094	6,481
Total current assets	284,438	258,018
Restricted cash	438	435
Property, plant and equipment, net	43,791	23,853
Goodwill	188,517	30,731
Intangibles, net	172,146	25,552
Deferred tax assets	3,926	3,281
Other assets	2,000	853
Total assets	695,256	342,723
Current liabilities:
Accounts payable	54,063	18,072
Accrued liabilities	51,088	21,507
Current portion of term loan	7,077	0
Income taxes payable	1,662	110
Deferred revenue	4,868	3,892
Total current liabilities	118,758	43,581
Long-term income taxes payable	1,240	1,069
Term loan, less current portion	141,417	0
Deferred tax liabilities	5,662	0
Deferred rent and other liabilities	4,595	3,392
Total liabilities	271,672	48,042
Commitments and contingencies (Note 18)
Stockholders’ equity:
Preferred stock, $0.001 par value: 10,000,000 shares authorized; no shares issued and outstanding at June 25, 2016 and December 26, 2015, respectively	0	0
Common stock, $0.001 par value: 250,000,000 shares authorized; 70,259,092 and 58,088,969 shares issued and outstanding at June 25, 2016 and December 26, 2015, respectively	70	58
Additional paid-in capital	823,152	718,904
Accumulated other comprehensive loss	(663)	(2,222)
Accumulated deficit	(398,975)	(422,059)
Total stockholders’ equity	423,584	294,681
Total liabilities and stockholders’ equity	$ 695,256	$ 342,723

Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Jun. 25, 2016	Dec. 26, 2015
Stockholders' Equity:
Preferred stock, par value (In dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (In shares)	10,000,000	10,000,000
Preferred stock, shares issued (In shares)	0	0
Preferred stock, shares outstanding (In shares)	0	0
Common stock, par value (In dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (In shares)	250,000,000	250,000,000
Common stock, shares issued (In shares)	70,259,092	58,088,969
Common stock, shares outstanding (In shares)	70,259,092	58,088,969

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 25, 2016	Jun. 27, 2015
Cash flows from operating activities:
Net income	$ 23,084	$ 1,621
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation and amortization	10,410	11,908
Accretion of discount on investments	(28)	0
Stock-based compensation expense	4,275	5,415
Deferred income tax (benefit) provision	(43,863)	7
Recovery of doubtful accounts receivable	(34)	(11)
Provision for excess and obsolete inventories	2,800	2,964
Gain on sale of long-lived assets	(32)	0
Impairment of long-lived assets	0	8
Non-cash restructuring	964	500
Foreign currency transaction (gains) losses	(1,753)	681
Changes in assets and liabilities:
Accounts receivable	(21,657)	1,077
Inventories	(7,978)	(1,663)
Prepaid expenses and other current assets	1,226	(817)
Refundable income taxes	0	782
Other assets	(286)	259
Accounts payable	21,177	1,051
Accrued liabilities	8,593	(1,640)
Income tax payable	(1)	(81)
Deferred rent and other liabilities	115	148
Deferred revenues	(602)	(539)
Net cash (used in) provided by operating activities	(3,590)	21,670
Cash flows from investing activities:
Acquisition of property, plant and equipment	(3,633)	(4,245)
Acquisition of Cascade Microtech, net of cash acquired	(215,216)	0
Proceeds from sale of subsidiary	19	35
Proceeds from sale of property, plant and equipment	53	0
Purchases of marketable securities	(10,587)	(23,761)
Proceeds from maturities of marketable securities	33,900	32,000
Change in restricted cash	(3)	0
Net cash (used in) provided by investing activities	(195,467)	4,029
Cash flows from financing activities:
Proceeds from issuances of common stock	1,961	1,803
Purchase and retirement of common stock	0	(3,508)
Proceeds from term loan debt	150,000	0
Payments of term loan debt issuance costs	(1,506)	0
Net cash provided by (used in) financing activities	150,455	(1,705)
Effect of exchange rate changes on cash and cash equivalents	2,563	(846)
Net (decrease) increase in cash and cash equivalents	(46,039)	23,148
Cash and cash equivalents, beginning of period	146,264	113,940
Cash and cash equivalents, end of period	100,225	137,088
Non-cash investing and financing activities:
Fair value of stock issued in connection with the acquisition of Cascade Microtech	93,216	0
Fair value of stock options and restricted stock-based awards assumed in connection with acquisition of Cascade Microtech	7,776	0
Fair value of vested stock options and restricted stock-based awards paid in cash in the third quarter of fiscal 2016 in connection with acquisition of Cascade Microtech	12,815	0
Changes in accounts payable and accrued liabilities related to property, plant and equipment purchases	1,292	42
Supplemental disclosure of cash flow information:
Income and property taxes paid (refunded), net	$ 217	$ (819)

Basis of Presentation and Summary of Significant Accounting Policies	6 Months Ended
	Jun. 25, 2016
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 six months ended June 25, 2016 are not necessarily indicative of the results that may be expected for the year ending December 31, 2016, or for any other period. The balance sheet at December 26, 2015 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 26, 2015 included in our Annual Report on Form 10-K filed with the SEC on March 4, 2016. Fiscal year. We operate on a 52/53 week fiscal year, whereby the fiscal year ends on the last Saturday of December. Fiscal 2016 and 2015 each contain 53 weeks and 52 weeks, respectively and the six months ended June 25, 2016 and June 27, 2015 each contained 26 weeks. Fiscal 2016 will end on December 31, 2016. Business Acquisition. On June 24, 2016, we completed the acquisition of Cascade Microtech Inc. ("Cascade Microtech"), headquartered in Beaverton, Oregon. Our consolidated financial statement as of June 25, 2016 included the condensed consolidated balance sheet of Cascade Microtech as of June 24, 2016 whereas our condensed consolidated statements of income for the three and six months ended June 25, 2016 excluded the financial results of Cascade Microtech for the second quarter of fiscal 2016 as the one-day stub period between the acquisition of Cascade Microtech and the end of our second quarter of fiscal 2016 was deemed immaterial. See Note 3 to the Condensed Consolidated Financial Statements - Acquisition, for further details. Critical Accounting Policies. Our critical accounting policies have not changed during the six months ended June 25, 2016 from those disclosed in our Annual Report on Form 10-K for the year ended December 26, 2015.

Concentration of Credit and Other Risks

6 Months Ended

Jun. 25, 2016

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 25, 2016		June 27, 2015		June 25, 2016		June 27, 2015
Intel	44.1	%	17.1	%	40.2	%	17.8	%
SK hynix	15.2		13.0		10.7		15.2
Samsung	*		13.1		*		13.4
Micron	*		17.8		*		14.3
	59.3	%	61.0	%	50.9	%	60.7	%

* Less than 10% of revenues.

At June 25, 2016, one customer accounted for approximately 36% of gross accounts receivable. At December 26, 2015, one customer accounted for approximately 29% of gross accounts receivable. No other customers accounted for more than 10% of gross accounts receivable at either of these fiscal period ends. We operate in the competitive semiconductor industry, including the Dynamic Random Access Memory, or DRAM, Flash memory, and Foundry & Logic (formerly known as System-on-Chip, or SoC) markets, which have been characterized by price erosion, rapid technological change, short product life cycles and heightened foreign and domestic competition. Significant technological changes in the industry could adversely affect our operating results.

Certain components for our 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.

Acquisition

6 Months Ended

Jun. 25, 2016

Business Combinations [Abstract]

Acquisition

On June 24, 2016, we acquired Cascade Microtech pursuant to the Agreement and Plan of Merger dated as of February 3, 2016 (the “Merger Agreement”) by and among us, Cascade Microtech and Cardinal Merger Subsidiary, Inc., an Oregon corporation and our wholly owned subsidiary. Cascade Microtech is an Oregon corporation that designs, develops, manufactures and markets advanced wafer probing, thermal and reliability solutions for the electrical measurement and testing of high performance semiconductor devices. Design, development and manufacturing operations are located in Oregon, United States and Munich and Dresden, Germany, and sales, service and support operations in North America, Germany, Japan, Taiwan, China and Singapore. The acquisition of Cascade Microtech transforms our business into a broader test and measurement market leader with significant scale and increased diversification and demand for the combined company’s products and technologies.

In accordance with the terms of the Merger Agreement, each outstanding share of Cascade Microtech common stock was canceled and converted into the right to receive $16.00 in cash, without interest, and 0.6534 of a share of FormFactor common stock. At the effective time of the merger (the “Effective Time”), each in-the-money Cascade Microtech stock option which was outstanding and vested prior to the Effective Time (or that vested as a result of the consummation of the merger) was canceled and converted into the right to receive an amount in cash equal to the excess, if any, of $21.47 over the applicable per share exercise price of such option. Each out-of-the-money option to purchase shares of Cascade Microtech common stock was canceled without any cash payment. Also at the Effective Time, each Cascade Microtech restricted stock unit which was outstanding and vested immediately prior to the Effective Time (or that vested as a result of the consummation of the Merger) was canceled and converted into the right to receive an amount of cash (without interest) equal to $21.47 per share underlying such restricted stock unit.

Additionally, all of the equity awards originally granted by Cascade Microtech which were outstanding and unvested immediately prior to the consummation of the merger (and that did not vest as a result of the consummation of the merger) were assumed by us on substantially the same terms at the Effective Time, except that the number of shares of our common stock that underlie the assumed award and the exercise price of any assumed option were determined pursuant to a formula intended to preserve the intrinsic value of the original award, resulting in the assumption of stock options exercisable for an aggregate of 152,276 shares of our common stock and restricted stock units representing 777,444 shares of our common stock as of the acquisition date. The fair value of the stock options assumed was determined using a Black-Scholes valuation model with market-based assumptions. The fair value of the restricted stock units assumed was $8.92 per unit, based on the FormFactor closing stock price on June 24, 2016. The fair value of unvested equity awards relating to future services, and not yet earned, will be recorded as operating expense over the remaining service periods. Option pricing models require the use of highly subjective market assumptions, including expected stock price volatility, which if changed can materially affect fair value estimates. See Note 14 to the Condensed Consolidated Financial Statements - Stockholder’s Equity, for further details.

The acquisition was accounted for using the acquisition method of accounting in accordance with the Financial Accounting Standards Board ("FASB") Accounting Standards Codification ("ASC") Topic No. 805, Business Combinations, with FormFactor treated as the acquirer. The acquired assets and liabilities of Cascade Microtech were recorded at their respective fair values including an amount for goodwill representing the difference between the acquisition consideration and the fair value of the identifiable net assets. As a result of the acquisition, Cascade Microtech shares ceased to trade on the NASDAQ Global Market effective June 24, 2016.

The total acquisition consideration of $325.1 million, net of cash acquired of $40.7 million was determined based on the terms of the Merger Agreement which consisted of the a) payment of $255.9 million in cash to former shareholders of Cascade Microtech, b) issuance of 10,450,189 shares of FormFactor's common stock to former shareholders of Cascade Microtech which was valued at the closing market price of $8.92 per share on June 24, 2016 and amounted to $93.2 million in the aggregate, c) payment of $12.8 million at the commencement of the third quarter of fiscal 2016, in cash, to Cascade Microtech outstanding and vested equity award holders, and d) $3.9 million attributable to the fair value of the assumed unvested equity awards for services performed by Cascade Microtech employees for the period leading up to the effective date of the acquisition.

During the three and six months ended June 25, 2016, we incurred approximately $2.1 million and $3.8 million, respectively, in transaction costs related to the acquisition, which primarily consisted of investment banking, legal, accounting and valuation-related expenses. These expenses were recorded in selling, general and administrative expense in the accompanying Condensed Consolidated Statements of Operations.

Our consolidated financial statement as of June 25, 2016 included the condensed consolidated balance sheet of Cascade Microtech as of June 24, 2016 whereas our condensed consolidated statements of income for the three and six months ended June 25, 2016 excluded the financial results of Cascade Microtech for the second quarter of fiscal 2016 as the one-day stub period between the acquisition of Cascade Microtech and the end of our second quarter of fiscal 2016 was deemed immaterial.

To finance a portion of the acquisition consideration, we entered into a credit agreement with certain lenders to provide a senior secured term loan facility in an aggregate amount of $150 million. See Note 5 to the Condensed Consolidated Financial Statements - Debt, for further details.

The acquisition price was allocated to the tangible and identified intangible assets acquired and liabilities assumed as of the closing date of the acquisition based upon their respective fair values. Asset categories acquired included working capital, long-term assets and liabilities and identifiable intangible assets, including in-process research and development ("IPR&D"). The allocation of the acquisition price has been prepared on a preliminary basis and changes to that allocation may occur as additional information becomes available. The fair values assigned to assets acquired and liabilities assumed are based on management’s best estimates and assumptions as of the reporting date and are considered preliminary pending finalization of valuation analyses pertaining to intangible assets acquired, liabilities assumed and tax liabilities assumed including calculation of deferred tax assets and liabilities. Changes to amounts recorded as assets or liabilities may result in corresponding adjustments to goodwill, recognized deferred tax assets and liabilities including changes to release of valuation allowance during the measurement period (up to one year from the acquisition date). Any such revisions or changes may be material as we finalize the fair values of the tangible and intangible assets acquired and liabilities assumed.

The table below summarizes the assets acquired and liabilities assumed as follows (in thousands):



	Amount
Cash and cash equivalents	$	40,681
Accounts receivable	27,112
Inventory	35,915
Prepaid expenses and other current assets	6,249
Property, plant and equipment	19,875
Other long-term assets	818
Deferred revenue	(1,829		)
Accounts payable and accrued liabilities	(22,901		)
Deferred tax liabilities	(43,344		)
Other long-term liabilities	(6,623		)
Total tangible assets acquired and liabilities assumed	55,953
Intangible assets	152,053
Goodwill	157,786
Total acquisition price	$	365,792

The intangible assets as of the closing date of the acquisition included (in thousands):



	Amount		Weighted Average Useful Life (in years)
Developed technologies	$	91,100	5.3
Customer relationships	23,153		7.0
Order backlog	17,800		0.7
Trade names	7,600		3.7
In-process research and development	12,400
Total intangible assets	$	152,053

Indications of fair value of the intangible assets acquired in connection with the acquisition were determined using either the income, market or replacement cost methodologies. The intangible assets are being amortized over periods which reflect the pattern in which economic benefits of the assets are expected to be realized. Order backlog is expected to be fully amortized by the second quarter of fiscal 2017.

Identifiable intangible assets

Developed technology acquired primarily consist of Cascade Microtech’s existing technologies related to manufacturing wafer testing stations (150mm, 200mm, 300 mm), thermal chuck systems used in wafer testing stations for testing wafers at specific temperatures, engineering and production probes used in testing wafers as well as reliability test systems. A Multi-Period Excess Earnings (MPEE) Method was used to value the developed technologies. Along with the cash flow forecast associated with each developed technology, other key assumptions in MPEE method are remaining life of technology, technology migration pattern (or technology decay curve), level of R&D required to maintain the technology, discount rate and applicable tax rate. Using this approach, the estimated fair values were calculated using expected future cash flows from specific products discounted to their net present values at an appropriate risk-adjusted rate of return that resulted in a value of $91.1 million and will be amortized over their useful lives.

Customer relationships represent the fair value of future projected revenues that will be derived from the sale of products to existing customers of the acquired company. The fair value of the customer relationships is determined based on the With and Without Method and resulted in a value of $23.2 million which will be amortized over their useful lives. The With and Without Method is appropriate for valuing non-primary customer-related assets for which reasonable estimates can be made for both the time and resources required to recreate those assets, as well as the economic impact over the period of time in which the assets are recreated. The Without scenario incorporates lost revenue and lost profits over the period necessary to retain the asset. Key assumptions in this valuation are attrition rate, time to recreate customer relationships, composition of costs into fixed versus variable costs, tax rates and discount rates.

Trade names and trademarks are considered a type of guarantee of a certain level of quality or performance represented by the brands owned including the Cascade Microtech brand. Trade names and trademarks were valued using the “relief-from-royalty income” approach. This method is based on the assumption that in lieu of ownership, a market participant would be willing to pay a royalty in order to exploit the related benefits of this asset. Key assumptions involved in valuation of trade names include royalty rate, expected utilization of the trade names, tax rates and discount rates. The value of the trade names acquired was determined to be $7.6 million and will be amortized over their useful lives.

IPR&D represents the estimated fair values of incomplete Cascade Microtech research and development projects that had not reached commercialization stage and meet the criteria for recognition as IPR&D as described in the American Institute of Certified Public Accountants IPR&D guide as of the date of the acquisition. In the future, the fair value of each project at the acquisition date will be either amortized or impaired depending on whether the projects are completed or abandoned. The fair value of IPR&D was determined using the MPEE method. For IPR&D, costs to complete the project and expected commercialization timeline are considered as key assumptions. This method reflects the present value of the projected cash flows that are expected to be generated by the IPR&D less charges representing the contribution of other assets to those cash flows. The value of the IPR&D was determined to be $12.4 million and the amortization will commence upon completion of the IPR&D projects.

Goodwill

The excess of purchase price over the fair value amounts assigned to the assets acquired and liabilities assumed represents the amount of goodwill resulting from the acquisition. We believe the factors that contributed to goodwill include synergies that are specific to our consolidated business such as cost savings and operational efficiencies and the acquisition of a talented workforce that expands our expertise in business development and commercializing semiconductor test products, none of which qualify for recognition as a separate intangible asset. We do not expect any portion of this goodwill to be deductible for tax purposes. The goodwill attributable to the acquisition has been recorded as a non-current asset and is not amortized, but is subject to an annual review for impairment.

The goodwill arising from the acquisition was preliminarily allocated to our reporting units based on the relative fair values of the expected incremental cash flows that the acquisition is expected to provide to each reporting unit within our reportable segments. The allocation of goodwill, which was prepared on a preliminary basis, may be subject to changes as additional information becomes available as the allocation was based on estimates and assumptions made by management at the time of acquisition. Goodwill is not expected to be deductible for tax purposes.

Operating and reporting segments, and reporting units

Upon acquisition of Cascade Microtech, we re-evaluated our operating and reportable segments as well as our reporting units for goodwill impairment consideration in accordance with Financial Accounting Standards Board's Accounting Standards Codification ("ASC") Topics Nos. 280, Segment Reporting and 350, Intangibles-Goodwill and Other. See Note 20 to the Condensed Consolidated Financial Statements - Operating Segments, for further details.

Pro forma consolidated results of operations

The following unaudited pro forma results of operations for the three and six months ended June 25, 2016 and June 27, 2015 presents the combined results of operations of FormFactor and Cascade Microtech as if the acquisition had been completed at the beginning of fiscal 2015. The pro forma information includes adjustments to amortization and depreciation for intangible assets and property, plant and equipment, adjustments to stock-based compensation expense, interest expense for the incremental indebtedness incurred, and interest income for the cash paid in connection with the transaction. The pro forma results for the six months ended June 27, 2015 includes non-recurring adjustments related to deferred tax asset valuation allowance release of $43.9 million which increases pro-forma net income, and acquisition-related transaction costs of $13.8 million and restructuring charges of $6.9 million which decreases pro-forma net income.

The pro forma results also include utilization of the net increase in the cost basis of acquired inventory and acquisition related expenses. The pro forma data are for informational purposes only and are not necessarily indicative of the consolidated results of operations of the combined business had the acquisition actually occurred at the beginning of fiscal year 2015 and 2016 or of the results of future operations of the combined business. Consequently, actual results may differ from the unaudited pro forma information presented below (in thousands, except per share data):



	Three Months Ended					Six Months Ended
	June 25, 2016		June 27, 2015			June 25, 2016			June 27, 2015
Revenues	$	120,112	$	109,929		$	208,526		$	212,500
Net Income (loss)	3,596		(20,868		)	(10,112		)	14,386
Net Income (loss) per share - basic	$	0.05	$	(0.30	)	$	(0.15	)	$	0.21
Net Income (loss) per share - Diluted	$	0.05	$	(0.30	)	$	(0.14	)	$	0.21

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1497-128463

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1490-128463

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1392-128463

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e7008-128479

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1486-128463

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1524-128463

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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+ Details

Goodwill and Intangible Assets

6 Months Ended

Jun. 25, 2016

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets

Goodwill recorded from the acquisition of Cascade Microtech on June 24, 2016 was $157.8 million as of June 25, 2016. The Company determined the total consideration paid for its acquisition of Cascade Microtech as well as the fair value of the assets acquired and liabilities assumed as of the acquisition date. The fair values assigned to assets acquired and liabilities assumed are based on management’s best estimates and assumptions as of the reporting date and are considered preliminary pending finalization of valuation analyses pertaining to intangible assets acquired, liabilities assumed and tax liabilities assumed including calculation of deferred tax assets and liabilities. Changes to amounts recorded as assets or liabilities may result in corresponding adjustments to goodwill, recognized deferred tax assets and liabilities including changes to release of valuation allowance during the measurement period (up to one year from the acquisition date). Any such revisions or changes may be material as we finalize the fair values of the tangible and intangible assets acquired and liabilities assumed. See Note 3 to the Condensed Consolidated Financial Statements - Acquisition, for further details.

Goodwill recorded from the acquisition of MicroProbe Inc. on October 16, 2012 was $30.7 million as of June 25, 2016 and remained unchanged from the amounts recorded as of December 26, 2015.

The Company has not recorded any historical goodwill impairments as of June 25, 2016.

The changes in intangible assets during the six months ended June 25, 2016 and the net book value of intangible assets as of June 25, 2016 and December 26, 2015 were as follows (in thousands):



	Intangible Assets, Gross Amount						Accumulated Amortization						Intangible Assets, Net				Weighted Average Useful Life
Other Intangible Assets (1)	December 26, 2015		Additions/Disposals		June 25, 2016		December 26, 2015		Expense, net		June 25, 2016		December 26, 2015		June 25, 2016		June 25, 2016
Existing developed technologies	$	52,200	$	91,100	$	143,300	$	39,581	$	4,158	$	43,739	$	12,619	$	99,561	5.1
Trade name	4,388		7,600		11,988		1,409		219		1,628		2,979		10,360		4.4
Customer relationships	17,000		23,153		40,153		7,046		1,082		8,128		9,954		32,025		6.3
Backlog	—		17,800		17,800		—		—		—		—		17,800		0.7
Total finite-lived intangible assets	73,588		139,653		213,241		48,036		5,459		53,495		25,552		159,746
In-process research and development	—		12,400		12,400		—		—		—		—		12,400
Total intangible assets	$	73,588	$	152,053	$	225,641	$	48,036	$	5,459	$	53,495	$	25,552	$	172,146



(1	)	Excludes fully amortized intangible assets

Intangible asset additions during the six months ended June 25, 2016 related to Cascade Microtech acquisition-see Note 3 to the Condensed Consolidated Financial Statements - Acquisition, for further details.

The IPR&D intangible assets are classified as indefinite lived 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 an asset may not be recoverable. The IPR&D assets will be subject to amortization upon completion of their respective research projects and when commercialization begins. The fair value assigned to IPR&D assets was determined using the MPEE 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 written-off.

For the three months ended June 25, 2016, amortization expense of $2.1 million and $0.6 million were included in cost of revenues and selling, general and administrative expenses, respectively. For the six months ended June 25, 2016, amortization expense of $4.2 million and $1.3 million were included in cost of revenues and selling, general and administrative expenses, respectively.

For the three months ended June 27, 2015, amortization expense of $2.6 million and $0.7 million were included in cost of revenues and selling, general and administrative expenses, respectively. For the six months ended June 27, 2015, amortization expense of $5.2 million and $1.3 million were included in cost of revenues and selling, general and administrative expenses, respectively.

Based on the carrying values of the intangible assets recorded as of June 25, 2016 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
2016	$	22,023
2017	32,913
2018	30,243
2019	27,675
2020	24,129
and thereafter	22,763
Total	$	159,746

As of the Effective Date of the acquisition of Cascade Microtech, we began operating under new reportable segments consisting of Probes and Systems segments. See Note 20 to the Condensed Consolidated Financial Statements - Operating Segments, for further details. The following table summarizes the changes in the carrying amount of goodwill, by reportable segments, for the six months ended June 25, 2016, applying the segment changes as of June 24, 2016, which was the date when we acquired Cascade Microtech.



	Probes		Systems		Total
	(in thousands)
Goodwill, gross, as of December 26, 2015	$	30,731	$	—	$	30,731
Additions-Cascade Microtech	141,496		16,290		157,786
Balance as of June 25, 2016	$	172,227	$	16,290	$	188,517

Debt

6 Months Ended

Jun. 25, 2016

Debt Disclosure [Abstract]

Debt

Senior Secured Term Loan Facility

Long-term debt as of June 25, 2016 consisted of the following (in thousands):



	June 25, 2016
Principal amount	$	150,000
Less debt issuance costs	(1,506		)
Long-term debt less debt issuance costs	$	148,494

On June 24, 2016, we entered into a Credit Agreement (the “Credit Agreement”) with HSBC Bank USA, National Association, as administrative agent, co-lead arranger, sole bookrunner and syndication agent, other lenders that may from time-to-time be a party to the Credit Agreement, and certain guarantors. Pursuant to the Credit Agreement, the lenders have provided us with a senior secured term loan facility of $150 million (the “Term Loan”). The proceeds of the Term Loan were used to finance a portion of the purchase price paid in connection with the Cascade Microtech acquisition and to pay related bank fees and expenses.

The Term Loan bears interest at a rate equal to, at our option, (i) the applicable London Interbank Offered Rate ("LIBOR") rate plus 2.00% per annum or (ii) Base Rate (as defined in the Credit Agreement) plus 1.00% per annum. We have initially elected to pay interest at 2.00% over LIBOR. Interest payments are payable in quarterly installments over a five-year period. The Term Loan will amortize in equal quarterly installments, beginning June 30, 2016, in an annual amount equal to 5% for year one, 10% for year two, 20% for year three, 30% for year four and 35% for year five. On July 25, 2016, we entered into a interest-rate swap agreement with HSBC to hedge the interest payments on our Term Loan entered into on June 24, 2016. See Note 22 to the Condensed Consolidated Financial Statements - Subsequent Events, for further details.

The obligations under the Term Loan are and will be fully and unconditionally guaranteed by certain of our existing and subsequently acquired or organized direct and indirect domestic subsidiaries and are secured by a perfected first priority security interest in substantially all of our assets and the assets of those guarantors, subject to certain customary exceptions. See Note 18 to the Condensed Consolidated Financial Statements - Commitments and Contingencies, for a schedule of our principal and interest payment commitments under the Term Loan.

The Credit Agreement contains negative covenants customary for financing of this type, including covenants that place limitations on the incurrence of additional indebtedness, the creation of liens, the payment of dividends; dispositions; fundamental changes, including mergers and acquisitions; loans and investments; sale leasebacks; negative pledges; transactions with affiliates; changes in fiscal year; sanctions and anti-bribery laws and regulations, and modifications to charter documents in a manner materially adverse to the Lenders. The Credit Agreement also contains affirmative covenants and representations and warranties customary for financing of this type.

In addition, the Credit Agreement contains financial maintenance covenants requiring, at the end of, and for, each period of four consecutive fiscal quarters, beginning as of June 30, 2016, (a) a ratio of total debt to earnings before interest, taxes, depreciation and amortization ("EBITDA") not in excess of 2.75 to 1:00, stepping down to 2.50 to 1.00 at the end of the fiscal quarter ending June 30, 2017; and (b) a fixed charge coverage ratio of not less than 1.50 to 1.00, stepping down to 1.30 to 1.00 on the fiscal quarter ending June 30, 2018 and to 1.20 to 1.00 at the end of the fiscal quarter ending June 30, 2019. As of June 25, 2016, the Company was in compliance with all of the financial covenants under the senior secured term loan facility.

The Credit Agreement contains customary events of default, including (subject to certain materiality thresholds and grace periods) payment default, failure to comply with covenants, material inaccuracy of representation or warranty, bankruptcy or insolvency proceedings, change of control, certain material Employee Retirement Security Act ("ERISA") events and cross event of default and cross-acceleration in respect of other material debt.

The foregoing description of the Credit Agreement does not purport to be complete and is subject to and qualified in its entirety by reference to the full text of the Credit Agreement, which is filed as Exhibit 10.1 to our Current Report on Form 8-K filed on June 28, 2016.

Restructuring Charges

6 Months Ended

Jun. 25, 2016

Restructuring and Related Activities [Abstract]

Restructuring Charges

Restructuring charges are comprised of costs related to employee termination benefits. During the three months ended June 25, 2016, we recorded approximately $0.5 million of severance charges and $0.3 million of stock-based compensation expense relating to the modification of certain equity-based awards of a full-time employee as a result of the consolidation of our sales operations. In addition, we also recorded approximately $5.4 million of severance charges and $0.7 million of stock-based compensation expense relating to the acceleration of certain equity-based awards of certain executives of Cascade Microtech who were terminated upon our acquisition of Cascade Microtech and in accordance with their contractual change of control agreements. The cash payments associated with the restructuring activities are expected to be paid by the end of the third quarter of fiscal 2016. See Note 3 to the Condensed Consolidated Financial Statements - Acquisition, for further details.

There were no restructuring charges during the three months ended March 26, 2016. During the six months ended June 27, 2015, we recorded stock-based compensation expense of approximately $0.5 million relating to the modification of an equity-based award.

The activities in the restructuring accrual for the six months ended June 25, 2016 were as follows (in thousands):



	Employee Severance and Benefits			Stock-based Compensation			Total
Accrual at December 26, 2015	$	2		$	—		$	2
Restructuring charges	5,946			964			6,910
Cash payments	(2		)	—			(2		)
Non-cash settlement	—			(964		)	(964		)
Accrual at June 25, 2016	$	5,946		$	—		$	5,946

The activities in the restructuring accrual for the six months ended June 27, 2015 were as follows (in thousands):



	Employee Severance and Benefits			Stock-based Compensation			Total
Accrual at December 27, 2014	$	584		$	—		$	584
Restructuring charges	—			500			500
Cash payments	(569		)	—			(569		)
Adjustment to restructuring charges	3			—			3
Non-cash settlement	—			(500		)	(500		)
Accrual at June 27, 2015	$	18		$	—		$	18

Fair Value

6 Months Ended

Jun. 25, 2016

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 and foreign currency derivatives (see Note 19 to the Condensed Consolidated Financial Statements - Derivative Financial Instruments, for a discussion of fair value of foreign currency derivatives).

Assets measured at fair value on a recurring basis as of June 25, 2016 were as follows (in thousands):



	Level 1		Level 2		Total
Assets:
Cash equivalents
Money market funds	$	18,694	$	—	$	18,694
Marketable securities
U.S. Treasuries	—		7,507		7,507
Agency securities (Federal)	—		10,601		10,601
Foreign exchange derivative contracts	—		317		317
Total	$	18,694	$	18,425	$	37,119

Assets measured at fair value on a recurring basis as of December 26, 2015 was as follows (in thousands):



	Level 1		Level 2		Total
Assets:
Cash equivalents
Money market funds	$	82,935	$	—	$	82,935
Marketable securities
U.S. Treasuries	—		18,853		18,853
Agency securities (Federal)	—		22,472		22,472
Total	$	82,935	$	41,325	$	124,260

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 the six months ended June 25, 2016 and June 27, 2015.

Assets Measured at Fair Value on a Non-Recurring Basis

We measure and report goodwill and intangible assets at fair value on a non-recurring basis if we determine these assets to be impaired or when we make a business acquisition. Refer to Note 4 to the Condensed Consolidated Financial Statements-Goodwill and Intangible Assets, for further details. The only assets that were measured at fair value on a nonrecurring basis during the three and six months ended June 25, 2016 related to the Cascade Acquisition. See Note 3 to the Condensed Consolidated Financial Statements - Acquisition, for further details. There were no assets measured at fair value on a nonrecurring basis during the three and six months ended June 27, 2015.

- 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. 25, 2016

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 25, 2016 consisted of the following (in thousands):



	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
U.S. Treasuries	$	7,498	$	9	$	—		$	7,507
Agency securities (Federal)	10,602		—		(1		)	10,601
	$	18,100	$	9	$	(1	)	$	18,108

Marketable securities at December 26, 2015 consisted of the following (in thousands):



	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
U.S. Treasuries	$	18,896	$	1	$	(44	)	$	18,853
Agency securities (Federal)	22,484		—		(12		)	22,472
	$	41,380	$	1	$	(56	)	$	41,325

The marketable securities with gross unrealized losses have been in a loss position for less than twelve months as of June 25, 2016 and December 26, 2015, 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, current market liquidity, interest rate risk, financial condition of the issuer, and credit rating downgrades. We believe that the unrealized losses are not other-than-temporary 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 25, 2016 were as follows (in thousands):



	Amortized Cost		Fair Value
Due in one year or less	$	10,602	$	10,601
Due after one year to five years	7,498		7,507
	$	18,100	$	18,108

There were no realized gains and losses on sales and maturities of marketable securities during the three and six months ended June 25, 2016 and June 27, 2015, respectively.

Allowance for Doubtful Accounts

6 Months Ended

Jun. 25, 2016

Receivables [Abstract]

Allowance for Doubtful Accounts

A reconciliation of the changes in our allowance for doubtful accounts receivable for the six months ended June 25, 2016 and June 27, 2015, respectively, is as follows (in thousands):



	June 25, 2016			June 27, 2015
Balance at beginning of period	$	284		$	266
Reductions	(34		)	(11		)
Balance at end of period	$	250		$	255

- 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. 25, 2016

Inventory Disclosure [Abstract]

Inventories

Inventories consisted of the following (in thousands):



	June 25, 2016		December 26, 2015
Raw materials	$	27,580	$	12,996
Work-in-progress	24,522		12,492
Finished goods	16,255		1,735
	$	68,357	$	27,223

Warranty

6 Months Ended

Jun. 25, 2016

Product Warranties Disclosures [Abstract]

Warranty

A reconciliation of the changes in our warranty liability for the six months ended June 25, 2016 and June 27, 2015, respectively, is as follows (in thousands):



	June 25, 2016			June 27, 2015
FormFactor Inc:
Balance at beginning of period	$	1,116		$	1,592
Accruals	2,054			828
Settlements	(1,693		)	(1,338		)
Balance at the end of period	$	1,477		$	1,082
Add warranty reserve from acquisition-Cascade Microtech	795			—
Balance at the end of the period	$	2,272		$	1,082

Long-lived Assets

6 Months Ended

Jun. 25, 2016

Property, Plant and Equipment [Abstract]

Long-lived Assets

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



	June 25, 2016			December 26, 2015
Machinery and equipment	$	164,310		$	150,983
Computer equipment and software	29,923			27,951
Furniture and fixtures	5,980			5,380
Leasehold improvements	73,032			67,121
Sub total	273,245			251,435
Less: accumulated depreciation and amortization	(236,665		)	(232,005		)
Net long-lived assets	36,580			19,430
Construction-in-progress	7,211			4,423
Total	$	43,791		$	23,853

During the six months ended June 25, 2016 and June 27, 2015, we ceased using fully depreciated assets with an acquired cost of $1.1 million and $0.4 million, respectively.

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 Loss

6 Months Ended

Jun. 25, 2016

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

Accumulated Other Comprehensive Loss

Accumulated other comprehensive loss includes foreign currency translation adjustments and unrealized losses on available-for-sale securities, net of tax, the impact of which has been excluded from earnings and reflected as components of stockholders' equity as shown below (in thousands):



	June 25, 2016			December 26, 2015
Unrealized loss on marketable securities, net of tax of $405 at June 25, 2016 and $428 at December 26, 2015, respectively	$	(443	)	$	(483	)
Cumulative translation adjustments	(220		)	(1,739		)
Accumulated other comprehensive loss	$	(663	)	$	(2,222	)

- 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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-Publisher FASB
-Name Accounting Standards Codification
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-Section 45
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-URI http://asc.fasb.org/extlink&oid=6522872

+ Details

Stockholders' Equity

6 Months Ended

Jun. 25, 2016

Stockholders' Equity Note [Abstract]

Stockholders' Equity

Stockholders’ Equity

Common Stock Repurchase Program

On April 16, 2015, our Board of Directors authorized a program to repurchase up to $25.0 million of outstanding common stock. Under the authorized stock repurchase program, we may repurchase shares from time-to-time on the open market. The pace of repurchase activity will depend on levels of cash generation, current stock price and other factors. The stock repurchase program was announced on April 16, 2015 and expired on April 15, 2016. During the six months ended June 25, 2016, we did not repurchase any shares under this program.

Restricted Stock Units

Restricted stock unit (RSU) activity under our equity incentive plan during the six months ended June 25, 2016 is set forth below:



	Units		Weighted Average Grant Date Fair Value
Restricted stock units at December 26, 2015	2,578,138		$	7.63
Awards granted	920,044		4.53
Awards vested	(1,416,349	)	7.03
Awards canceled	(97,500	)	5.51
Restricted stock units at June 25, 2016	1,984,333		$	6.72

On June 24, 2016, pursuant to the Agreement and Plan of Merger with Cascade Microtech, we granted 777,444 RSUs with a total grant date fair value of approximately $6.9 million, of which approximately $3.6 million was attributable to the fair value of the assumed unvested RSUs for services performed by Cascade Microtech employees for the period leading up to the effective date of the acquisition and which was included as part of the purchase price consideration. See Note 3 to the Condensed Consolidated Financial Statements - Acquisition, for further details.

On May 2, 2016, we issued 40,000 RSUs to our Chief Executive Officer which will vest based on certain market performance criteria. The performance criteria are based on a metric called our Total Shareholder Return (TSR) for the period from April 1, 2016 to March 31, 2019 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, 2016. The total stock-based compensation cost of approximately $0.3 million will be recognized ratably over the requisite service period.

On May 28, 2015, we issued 195,000 RSUs to seven senior executives of our company that will vest based on certain market performance criteria. The performance criteria are based on a metric called our Total Shareholder Return (TSR) for the period from April 1, 2015 to March 31, 2017 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, 2015. The total stock-based compensation cost of approximately $1.5 million will be recognized ratably over the requisite service period.

On May 5, 2014, we issued 350,000 RSUs to seven senior executives of our company that will vest based on certain market performance criteria. The performance criteria are based on our 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. Upon the review of the market performance criteria on April 4, 2016, our Compensation Committee certified a total earn out of 328,600 RSUs which immediately vested as of that date.

The total fair value of RSUs vested during the three and six months ended June 25, 2016 and June 27, 2015 was $6.4 million and $10.4 million, and $10.0 million and $17.5 million, respectively.

Stock Options

On June 24, 2016, pursuant to the Agreement and Plan of Merger with Cascade Microtech, we granted 152,276 stock options with a total grant date fair value of approximately $0.8 million, of which approximately $0.3 million was attributable to the fair value of the assumed unvested options for services performed by Cascade Microtech employees for the period leading up to the effective date of the acquisition and which was included as part of the purchase price consideration. See Note 3 to the Condensed Consolidated Financial Statements - Acquisition, for further details.

During the six months ended June 27, 2015, we granted 450,000 stock options to our Chief Executive Officer with a grant-date fair value of approximately $1.7 million which will be recognized as stock-based compensation expense ratably over the service period. The following weighted average assumptions were used in the estimated grant-date fair value calculations using the Black-Scholes option pricing model:



Stock Options:
Dividend yield	—	%
Expected volatility	47.5	%
Risk-free interest rate	1.57	%
Expected term (in years)	5.52

- 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. 25, 2016

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 RSUs and 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 Income over the requisite service period.

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



	Three Months Ended				Six Months Ended
	June 25, 2016		June 27, 2015		June 25, 2016		June 27, 2015
Stock-based compensation included in:
Cost of revenues	$	405	$	602	$	1,038	$	1,185
Research and development	542		726		1,338		1,571
Selling, general and administrative	594		1,178		1,899		2,659
Total stock-based compensation	1,541		2,506		4,275		5,415
Tax effect of stock-based compensation	—		—		—		—
Total stock-based compensation, net of tax	$	1,541	$	2,506	$	4,275	$	5,415

During the six months ended June 25, 2016, we recorded approximately $0.3 million of stock-based compensation expense relating to the modification of certain equity-based awards of a full-time employee as a result of the consolidation of our sales operations. In addition, we also recorded approximately $0.7 million of stock-based compensation expense relating to the acceleration of certain equity-based awards of an executive of Cascade Microtech who was terminated upon our acquisition of Cascade Microtech and in accordance with his contractual change of control agreement with Cascade Microtech. During the six months ended June 27, 2015, we recorded stock-based compensation expense of approximately $0.5 million relating to the modification of an equity-based award. We therefore classified these stock-based compensation expenses as restructuring-related expenses. Refer to Note 6 to the Condensed Consolidated Financial Statements - Restructuring Charges for further details.

Employee Stock Purchase Plan

Under our 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 25, 2016 and June 27, 2015, we did not issue any ESPP shares. During the six months ended June 25, 2016 and June 27, 2015, we issued 303,585 and 302,705 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:



	Six Months Ended
	June 25, 2016		June 27, 2015
ESPP:
Dividend yield	—	%	—	%
Expected volatility	45.3	%	51.7	%
Risk-free interest rate	0.40	%	0.08	%
Expected term (in years)	0.50		1.00

Unrecognized Compensation Costs

At June 25, 2016, the unrecognized stock-based compensation, adjusted for estimated forfeitures, was as follows (in thousands):



	Unrecognized Expense		Average Expected Recognition Period in years
Stock options	$	1,430	2.51
Restricted stock units	10,994		2.78
Employee stock purchase plan	84		0.10
Total unrecognized stock-based compensation expense	$	12,508

- Definition

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

+ References + Details

Net Income per Share

6 Months Ended

Jun. 25, 2016

Earnings Per Share [Abstract]

Net Income per Share

Basic net income per share for the three and six months ended June 25, 2016 and June 27, 2015 was computed by dividing net income by the weighted-average number of common shares outstanding for the period. Diluted net income per share for the three and six months ended June 25, 2016 and June 27, 2015 was computed by dividing net income by the diluted weighted-average number of shares outstanding during that period.

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



	Three Months Ended				Six Months Ended
	June 25, 2016		June 27, 2015		June 25, 2016		June 27, 2015
Numerator:
Net income used in computing basic and diluted net income per share	$	36,884	$	838	$	23,084	$	1,621
Denominator:
Weighted-average shares used in computing basic net income per share	59,572		58,109		59,001		57,532
Add potentially dilutive securities	416		985		638		1,342
Weighted-average shares used in computing basic and diluted net income per share	59,988		59,094		59,639		58,874

The following securities were excluded from the calculation of diluted net income per share because their effect would have been anti-dilutive for the periods presented (in thousands):



	Three Months Ended		Six Months Ended
	June 25, 2016	June 27, 2015	June 25, 2016	June 27, 2015
Options to purchase common stock	2,255	1,948	1,809	2,059
Restricted stock units	4	—	—	197
Total potentially dilutive securities	2,259	1,948	1,809	2,256

Income Taxes	6 Months Ended
Income Taxes	Jun. 25, 2016
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes We recorded an income tax benefit of $43.7 million for each of the three and six months ended June 25, 2016 and an income tax provision of $24 thousand and $0.1 million for the three and six months ended June 27, 2015, respectively. The income tax benefit for the three and six months ended June 25, 2016 was primarily due to the release of valuation allowance of our deferred tax assets ("DTAs"). In connection with our acquisition of Cascade Microtech on June 24, 2016, deferred tax liabilities ("DTLs") were established on the acquired identifiable intangible assets. These DTLs exceeded the acquired DTAs by approximately $43.9 million and created additional sources of income to realize a tax benefit for our DTAs. As such, authoritative guidance under United States GAAP requires the impact on the acquiring company's deferred tax assets and liabilities caused by an acquisition be recorded in the acquiring company's financial statements outside of acquisition accounting. Accordingly, the valuation allowance on a portion of our DTAs was released and resulted in an income tax benefit of approximately $43.9 million.

Commitments and Contingencies

6 Months Ended

Jun. 25, 2016

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Contractual and purchase obligations

We lease facilities under non-cancelable operating leases with various expiration dates through 2024. 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 as of June 25, 2016 from those disclosed in our Annual Report on Form 10-K for the year ended December 26, 2015, apart from Cascade Microtech's lease and purchase obligations which are disclosed below as of June 25, 2016, and arising as a result of our acquisition of Cascade Microtech on June 24, 2016. See Note 3 to the Condensed Consolidated Financial Statements - Acquisition, for further details.



	Remainder of 2016		2017-2018		2019-2020		2021 and Beyond		Total
	(In thousands)
Operating leases	$	1,225	$	4,091	$	1,868	$	384	$	7,568
Purchase order commitments obligations (1)	5,227		169		—		—		5,396
Total	$	6,452	$	4,260	$	1,868	$	384	$	12,964



(1)	Purchase order commitments primarily represent open orders for inventory and capital expenditures.

Also, our contractual obligations as of June 25, 2016 include our commitments under the senior secured term loan facility, as disclosed below. See Note 5 to the Condensed Consolidated Financial Statements - Debt for further details.



	Remainder of 2016		2017-2018		2019-2020		2021		Total
	(In thousands)
Principal payments	$	5,625	$	39,375	$	91,875	$	13,125	$	150,000
Interest payments*	1,613		5,339		2,765		65		9,782
Total	$	7,238	$	44,714	$	94,640	$	13,190	$	159,782

* Represents our minimum interest payment commitments at 2.00% per annum

Environmental Matters

We are subject to U.S. Federal, State, 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 25, 2016, or in our fiscal 2015. In the future, we may receive notices of violations of environmental regulations, or otherwise learn of such violations. Environmental contamination or violations may negatively impact our business.

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 products or services infringe a third party's intellectual property or cause property or other damages 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 pay 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. We have not recorded any liabilities for these indemnification arrangements on our condensed consolidated balance sheet as of June 25, 2016.

Legal Matters

From time to time, we may be subject to legal proceedings and claims in the ordinary course of business. In the first quarter of fiscal 2016, we were named in a proceeding in connection with our acquisition of Cascade Microtech and in the second quarter of fiscal 2016, we entered into a memorandum of understanding with the plaintiff in connection with the proceeding. 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.

On March 8, 2016, an individual plaintiff filed a putative class action lawsuit on behalf of Cascade Microtech's shareholders against Cascade Microtech, its directors, FormFactor and Cascade Merger Sub, in connection with Cascade Microtech and FormFactor entering into a merger agreement. The lawsuit, captioned Lum v. Cascade Microtech, Inc., et al., No. 16CV07293, was filed in Washington County Circuit Court in the State of Oregon.

On April 8, 2016, another individual plaintiff filed a similar putative class action lawsuit against the same defendants. The lawsuit, captioned Solak v. Cascade Microtech, Inc., et al., No. 16CV11809, was filed in Multnomah County Circuit Court in the State of Oregon.

On April 20, 2016, the Lum lawsuit was dismissed without prejudice at the request of the plaintiff. The litigation proceeds in Multnomah County Circuit Court with the Solak complaint as the operative complaint. The Solak lawsuit alleges that the individual members of Cascade Microtech’s board of directors breached their fiduciary duties owed to Cascade Microtech’s shareholders by approving the proposed merger for inadequate consideration; approving the merger to obtain unique benefits not shared equally with Cascade Microtech’s other shareholders; failing to take steps to maximize the value paid to Cascade Microtech shareholders; failing to take steps to ensure a fair process leading up to the proposed merger; and agreeing to preclusive deal protection devices in the merger agreement. The lawsuit also alleges claims against FormFactor and one of its subsidiaries for aiding and abetting the alleged breaches of fiduciary duties by the individual members of Cascade Microtech’s board of directors. In the Solak lawsuit, the plaintiff has sought, among other things, rescission of the merger, plaintiff’s attorney’s fees and costs, and other relief.

Under a memorandum of understanding signed by the parties and filed with the court in the Solak case, Cascade Microtech and FormFactor agreed with the plaintiff’s counsel to supplement the disclosures made in connection with the merger. The supplemental disclosures were made on June 14, 2016. Under the memorandum of understanding, the parties to the Solak lawsuit agreed to use their collective best efforts to obtain final approval of the proposed settlement and the dismissal of the Solak litigation with prejudice. Subject to completion of certain confirmatory discovery by counsel to the plaintiff, the memorandum of understanding contemplates that the parties will enter into a stipulation of settlement. The stipulation of settlement will be subject to customary conditions, including court approval following notice to Cascade Microtech’s former shareholders within the proposed class.

As stated in the memorandum of understanding, if the settlement is finally approved by the Oregon court, the parties anticipate that it will resolve and release all claims in the Solak lawsuit pursuant to terms that will be disclosed to Cascade Microtech shareholders prior to final approval of the settlement. In addition, in connection with the settlement, the parties contemplate that plaintiff’s counsel in the Solak lawsuit will file a petition in the Oregon court for an award of attorneys’ fees and expenses. Cascade Microtech will pay any attorneys’ fees and expenses awarded by the Oregon court. There can be no assurance that the parties will ultimately enter into a stipulation of settlement or that the Oregon court will approve the settlement even if the parties were to enter into such stipulation. In such event, the proposed settlement as contemplated by the memorandum of understanding may be terminated.

Other Litigation

In August 2013, a former employee 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. On January 4, 2016, the court certified the plaintiff class. The lawsuit is currently proceeding to notice to class members and merits discovery. 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. The Company currently believes that any settlement reached would be an amount that is not material to the Company's financial statements. If the matter is not settled, the Company could incur material attorneys’ fees in defending the lawsuit.

Derivative Financial Instruments

6 Months Ended

Jun. 25, 2016

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 (expense), net” in our Condensed Consolidated Statements of Income for both realized and unrealized gains and losses.

The following table provides information about our foreign currency forward contracts outstanding as of June 25, 2016 (in thousands):



Currency	Contract Position	Contract Amount (Local Currency)		Contract Amount (U.S. Dollars)
Japanese Yen	Buy	(629,473	)	$	(6,173	)
Taiwan Dollar	Buy	(36,695	)	(1,137		)
Korean Won	Buy	(1,528,806	)	(1,350		)
Euro	Buy	(2,200	)	(2,525		)
Euro	Sell	1,099		1,245
Euro	Sell	17,011		19,406
Japanese Yen	Sell	179,263		1,661
Japanese Yen	Sell	140,000		1,256
Total USD notional amount of outstanding foreign exchange contracts				$	12,383

The contracts were entered into during the second quarter of fiscal 2016 and matured in July 2016. 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. Approximately $0.3 million of unrealized gains was recorded as a current asset in the balance sheet of Cascade Microtech which was acquired as of June 24, 2016 (and subsequently recorded as a current asset in our condensed consolidated balance sheet of June 25, 2016) relating to foreign currency forward contracts.

The location and amount of gains (losses) related to non-designated derivative instruments that matured in the three and six months ended June 25, 2016 and June 27, 2015 in the Condensed Consolidated Statements of Operations are as follows (in thousands):



		Amount of Gain (Loss) Recognized on Derivatives
		Three Months Ended					Six Months Ended
Derivatives Not Designated as Hedging Instruments	Location of Gain (Loss) Recognized on Derivatives	June 25, 2016			June 27, 2015			June 25, 2016			June 27, 2015
Foreign exchange forward contracts	Other income (expense), net	$	(141	)	$	847		$	(1,703	)	$	685

- 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.

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+ Details

Operating Segments

6 Months Ended

Jun. 25, 2016

Segment Reporting [Abstract]

Operating Segments

Until the acquisition of Cascade Microtech, we operated in one reportable segment consisting of one operating segment relating to the design, development, manufacture and sale of high performance advanced probe cards. Our chief operating decision maker ("CODM") is our Chief Executive Officer, who reviews operating results to make decisions about allocating resources and assessing performance for the entire company.

Upon the acquisition of Cascade Microtech (See Note 3 to the Condensed Consolidated Financial Statements - Acquisition, for further details), we re-evaluated our CODM's decision process for allocating resources and assessing performance for the company and determined that we now operate in two reportable segments consisting of Probes and Systems segments, and four operating segments consisting of FormFactor Probes, Cascade Microtech Probes, Systems, and Integrated Measurement Solutions ("IMS") segments. These four operating segments have been aggregated into two reportable segments as noted above based on common economic and qualitative characteristics.

For the purposes of our goodwill impairment analysis, until and up to the acquisition of Cascade Microtech, we concluded that we had one reporting unit, which relates to the design, development, manufacture and sale of high performance advanced probe cards. Upon the acquisition of Cascade Microtech, we now believe that we have five reporting units consisting of FormFactor Probes, Cascade Microtech Probes, Systems, Advanced Temperature Test Systems GmbH ("ATT") Systems, and IMS.

Long-lived assets, comprising of net property, plant and equipment, goodwill and net intangibles assets are not disclosed by geographic location as our CODM does not review these assets in order to make decisions about allocating resources and assessing performance for the entire combined company.

The following table summarizes the operating results by reportable segments for the three months ended June 25, 2016 (in thousands):



	Probes			Systems		Total

Revenues	$	83,083		$	—	$	83,083
Operating loss	(6,646		)	—		(6,646		)

Operating results provides useful information to our management for assessment of our performance and results of operations. Components of our operating results are utilized to determine executive compensation along with other measures.

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
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-URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8981-108599

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-Name Accounting Standards Codification
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+ Details

Business Interruption Insurance Claim Recovery	6 Months Ended
Business Interruption Insurance Claim Recovery	Jun. 25, 2016
Unusual or Infrequent Items, or Both [Abstract]
Business Interruption Insurance Claim Recovery	Business Interruption Insurance Claim Recovery During the six months ended June 27, 2015, we received approximately $1.5 million as a result of a payment from our insurer arising from a business interruption insurance claim related to a factory fire at a customer during the second half of fiscal 2013. We recorded this cash receipt within “Other income (expense), net” in our Condensed Consolidated Statements of Operations.

Subsequent Events	6 Months Ended
Subsequent Events	Jun. 25, 2016
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On July 25, 2016, we entered into an interest-rate swap agreement with HSBC to hedge the interest payments on our Term Loan entered into on June 24, 2016. The Term Loan has a LIBOR based floating interest rate and matures on 31st March 2021. As future levels of LIBOR over the life of the loan are uncertain, we entered into an interest-rate swap agreement to hedge the exposure in interest rate risks associated with movement in LIBOR rates. See Note 5 to the Condensed Consolidated Financial Statements - Debt, for further details of the Term Loan. The interest-rate swap contract was designated as a hedge instrument under ASC 815, Derivatives and Hedging.

Basis of Presentation and Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 25, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Fiscal Year	Fiscal year. We operate on a 52/53 week fiscal year, whereby the fiscal year ends on the last Saturday of December. Fiscal 2016 and 2015 each contain 53 weeks and 52 weeks, respectively and the six months ended June 25, 2016 and June 27, 2015 each contained 26 weeks. Fiscal 2016 will end on December 31, 2016.
Fair Value 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 and foreign currency derivatives (see Note 19 to the Condensed Consolidated Financial Statements - Derivative Financial Instruments, for a discussion of fair value of foreign currency derivatives). Assets Measured at Fair Value on a Non-Recurring Basis We measure and report goodwill and intangible assets at fair value on a non-recurring basis if we determine these assets to be impaired or when we make a business acquisition. Refer to Note 4 to the Condensed Consolidated Financial Statements-Goodwill and Intangible Assets, for further details. The only assets that were measured at fair value on a nonrecurring basis during the three and six months ended June 25, 2016 related to the Cascade Acquisition. See Note 3 to the Condensed Consolidated Financial Statements - Acquisition, for further details.

Concentration of Credit and Other Risks (Tables)

6 Months Ended

Jun. 25, 2016

Risks and Uncertainties [Abstract]

Schedule of Concentration Risk, Customer Percentage of Revenue

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 25, 2016		June 27, 2015		June 25, 2016		June 27, 2015
Intel	44.1	%	17.1	%	40.2	%	17.8	%
SK hynix	15.2		13.0		10.7		15.2
Samsung	*		13.1		*		13.4
Micron	*		17.8		*		14.3
	59.3	%	61.0	%	50.9	%	60.7	%

* Less than 10% of revenues.

Acquisition (Tables)

6 Months Ended

Jun. 25, 2016

Business Combinations [Abstract]

Schedule of Assets Acquired and Liabilities Assumed

The table below summarizes the assets acquired and liabilities assumed as follows (in thousands):



	Amount
Cash and cash equivalents	$	40,681
Accounts receivable	27,112
Inventory	35,915
Prepaid expenses and other current assets	6,249
Property, plant and equipment	19,875
Other long-term assets	818
Deferred revenue	(1,829		)
Accounts payable and accrued liabilities	(22,901		)
Deferred tax liabilities	(43,344		)
Other long-term liabilities	(6,623		)
Total tangible assets acquired and liabilities assumed	55,953
Intangible assets	152,053
Goodwill	157,786
Total acquisition price	$	365,792

Summary of Finite-Lived Intangible Assets Acquired

The intangible assets as of the closing date of the acquisition included (in thousands):



	Amount		Weighted Average Useful Life (in years)
Developed technologies	$	91,100	5.3
Customer relationships	23,153		7.0
Order backlog	17,800		0.7
Trade names	7,600		3.7
In-process research and development	12,400
Total intangible assets	$	152,053

Summary of Indefinite-Lived Intangible Assets Acquired

The intangible assets as of the closing date of the acquisition included (in thousands):



	Amount		Weighted Average Useful Life (in years)
Developed technologies	$	91,100	5.3
Customer relationships	23,153		7.0
Order backlog	17,800		0.7
Trade names	7,600		3.7
In-process research and development	12,400
Total intangible assets	$	152,053

Schedule of Pro Forma Information



	Three Months Ended					Six Months Ended
	June 25, 2016		June 27, 2015			June 25, 2016			June 27, 2015
Revenues	$	120,112	$	109,929		$	208,526		$	212,500
Net Income (loss)	3,596		(20,868		)	(10,112		)	14,386
Net Income (loss) per share - basic	$	0.05	$	(0.30	)	$	(0.15	)	$	0.21
Net Income (loss) per share - Diluted	$	0.05	$	(0.30	)	$	(0.14	)	$	0.21

Goodwill and Intangible Assets (Tables)

6 Months Ended

Jun. 25, 2016

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Indefinite-Lived Intangible Assets

The changes in intangible assets during the six months ended June 25, 2016 and the net book value of intangible assets as of June 25, 2016 and December 26, 2015 were as follows (in thousands):



	Intangible Assets, Gross Amount						Accumulated Amortization						Intangible Assets, Net				Weighted Average Useful Life
Other Intangible Assets (1)	December 26, 2015		Additions/Disposals		June 25, 2016		December 26, 2015		Expense, net		June 25, 2016		December 26, 2015		June 25, 2016		June 25, 2016
Existing developed technologies	$	52,200	$	91,100	$	143,300	$	39,581	$	4,158	$	43,739	$	12,619	$	99,561	5.1
Trade name	4,388		7,600		11,988		1,409		219		1,628		2,979		10,360		4.4
Customer relationships	17,000		23,153		40,153		7,046		1,082		8,128		9,954		32,025		6.3
Backlog	—		17,800		17,800		—		—		—		—		17,800		0.7
Total finite-lived intangible assets	73,588		139,653		213,241		48,036		5,459		53,495		25,552		159,746
In-process research and development	—		12,400		12,400		—		—		—		—		12,400
Total intangible assets	$	73,588	$	152,053	$	225,641	$	48,036	$	5,459	$	53,495	$	25,552	$	172,146



(1	)	Excludes fully amortized intangible assets

Schedule of Finite-Lived Intangible Assets

The changes in intangible assets during the six months ended June 25, 2016 and the net book value of intangible assets as of June 25, 2016 and December 26, 2015 were as follows (in thousands):



	Intangible Assets, Gross Amount						Accumulated Amortization						Intangible Assets, Net				Weighted Average Useful Life
Other Intangible Assets (1)	December 26, 2015		Additions/Disposals		June 25, 2016		December 26, 2015		Expense, net		June 25, 2016		December 26, 2015		June 25, 2016		June 25, 2016
Existing developed technologies	$	52,200	$	91,100	$	143,300	$	39,581	$	4,158	$	43,739	$	12,619	$	99,561	5.1
Trade name	4,388		7,600		11,988		1,409		219		1,628		2,979		10,360		4.4
Customer relationships	17,000		23,153		40,153		7,046		1,082		8,128		9,954		32,025		6.3
Backlog	—		17,800		17,800		—		—		—		—		17,800		0.7
Total finite-lived intangible assets	73,588		139,653		213,241		48,036		5,459		53,495		25,552		159,746
In-process research and development	—		12,400		12,400		—		—		—		—		12,400
Total intangible assets	$	73,588	$	152,053	$	225,641	$	48,036	$	5,459	$	53,495	$	25,552	$	172,146



(1	)	Excludes fully amortized intangible assets

Schedule of Finite-Lived Intangible Asset Future Amortization Expense



Fiscal Year	Amount
2016	$	22,023
2017	32,913
2018	30,243
2019	27,675
2020	24,129
and thereafter	22,763
Total	$	159,746

Schedule of Changes in Goodwill by Segment

The following table summarizes the changes in the carrying amount of goodwill, by reportable segments, for the six months ended June 25, 2016, applying the segment changes as of June 24, 2016, which was the date when we acquired Cascade Microtech.



	Probes		Systems		Total
	(in thousands)
Goodwill, gross, as of December 26, 2015	$	30,731	$	—	$	30,731
Additions-Cascade Microtech	141,496		16,290		157,786
Balance as of June 25, 2016	$	172,227	$	16,290	$	188,517

Debt (Tables)

6 Months Ended

Jun. 25, 2016

Debt Disclosure [Abstract]

Schedule of Long-term Debt

Long-term debt as of June 25, 2016 consisted of the following (in thousands):



	June 25, 2016
Principal amount	$	150,000
Less debt issuance costs	(1,506		)
Long-term debt less debt issuance costs	$	148,494

Restructuring Charges (Tables)

6 Months Ended

Jun. 25, 2016

Restructuring and Related Activities [Abstract]

Schedule of Restructuring Accrual Activity

The activities in the restructuring accrual for the six months ended June 25, 2016 were as follows (in thousands):



	Employee Severance and Benefits			Stock-based Compensation			Total
Accrual at December 26, 2015	$	2		$	—		$	2
Restructuring charges	5,946			964			6,910
Cash payments	(2		)	—			(2		)
Non-cash settlement	—			(964		)	(964		)
Accrual at June 25, 2016	$	5,946		$	—		$	5,946

The activities in the restructuring accrual for the six months ended June 27, 2015 were as follows (in thousands):



	Employee Severance and Benefits			Stock-based Compensation			Total
Accrual at December 27, 2014	$	584		$	—		$	584
Restructuring charges	—			500			500
Cash payments	(569		)	—			(569		)
Adjustment to restructuring charges	3			—			3
Non-cash settlement	—			(500		)	(500		)
Accrual at June 27, 2015	$	18		$	—		$	18

Fair Value (Tables)

6 Months Ended

Jun. 25, 2016

Fair Value Disclosures [Abstract]

Fair Value Assets Measured on Recurring Basis

Assets measured at fair value on a recurring basis as of June 25, 2016 were as follows (in thousands):



	Level 1		Level 2		Total
Assets:
Cash equivalents
Money market funds	$	18,694	$	—	$	18,694
Marketable securities
U.S. Treasuries	—		7,507		7,507
Agency securities (Federal)	—		10,601		10,601
Foreign exchange derivative contracts	—		317		317
Total	$	18,694	$	18,425	$	37,119

Assets measured at fair value on a recurring basis as of December 26, 2015 was as follows (in thousands):



	Level 1		Level 2		Total
Assets:
Cash equivalents
Money market funds	$	82,935	$	—	$	82,935
Marketable securities
U.S. Treasuries	—		18,853		18,853
Agency securities (Federal)	—		22,472		22,472
Total	$	82,935	$	41,325	$	124,260

Marketable Securities (Tables)

6 Months Ended

Jun. 25, 2016

Investments, Debt and Equity Securities [Abstract]

Schedule of Marketable Securities

Marketable securities at June 25, 2016 consisted of the following (in thousands):



	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
U.S. Treasuries	$	7,498	$	9	$	—		$	7,507
Agency securities (Federal)	10,602		—		(1		)	10,601
	$	18,100	$	9	$	(1	)	$	18,108

Marketable securities at December 26, 2015 consisted of the following (in thousands):



	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
U.S. Treasuries	$	18,896	$	1	$	(44	)	$	18,853
Agency securities (Federal)	22,484		—		(12		)	22,472
	$	41,380	$	1	$	(56	)	$	41,325

Schedule of Contractual Maturities of Marketable Securities

Contractual maturities of marketable securities as of June 25, 2016 were as follows (in thousands):



	Amortized Cost		Fair Value
Due in one year or less	$	10,602	$	10,601
Due after one year to five years	7,498		7,507
	$	18,100	$	18,108

Allowance for Doubtful Accounts (Tables)

6 Months Ended

Jun. 25, 2016

Receivables [Abstract]

Reconciliation of Changes in Allowance for Doubtful Accounts

A reconciliation of the changes in our allowance for doubtful accounts receivable for the six months ended June 25, 2016 and June 27, 2015, respectively, is as follows (in thousands):



	June 25, 2016			June 27, 2015
Balance at beginning of period	$	284		$	266
Reductions	(34		)	(11		)
Balance at end of period	$	250		$	255

Inventories (Tables)

6 Months Ended

Jun. 25, 2016

Inventory Disclosure [Abstract]

Schedule of Inventory Components

Inventories consisted of the following (in thousands):



	June 25, 2016		December 26, 2015
Raw materials	$	27,580	$	12,996
Work-in-progress	24,522		12,492
Finished goods	16,255		1,735
	$	68,357	$	27,223

Warranty (Tables)

6 Months Ended

Jun. 25, 2016

Product Warranties Disclosures [Abstract]

Reconciliation of Changes in Warranty Liability

A reconciliation of the changes in our warranty liability for the six months ended June 25, 2016 and June 27, 2015, respectively, is as follows (in thousands):



	June 25, 2016			June 27, 2015
FormFactor Inc:
Balance at beginning of period	$	1,116		$	1,592
Accruals	2,054			828
Settlements	(1,693		)	(1,338		)
Balance at the end of period	$	1,477		$	1,082
Add warranty reserve from acquisition-Cascade Microtech	795			—
Balance at the end of the period	$	2,272		$	1,082

Long-lived Assets (Tables)

6 Months Ended

Jun. 25, 2016

Property, Plant and Equipment [Abstract]

Summary of Property, Plant, and Equipment

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



	June 25, 2016			December 26, 2015
Machinery and equipment	$	164,310		$	150,983
Computer equipment and software	29,923			27,951
Furniture and fixtures	5,980			5,380
Leasehold improvements	73,032			67,121
Sub total	273,245			251,435
Less: accumulated depreciation and amortization	(236,665		)	(232,005		)
Net long-lived assets	36,580			19,430
Construction-in-progress	7,211			4,423
Total	$	43,791		$	23,853

Accumulated Other Comprehensive Loss (Tables)

6 Months Ended

Jun. 25, 2016

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

Schedule of Accumulated Other Comprehensive Loss



	June 25, 2016			December 26, 2015
Unrealized loss on marketable securities, net of tax of $405 at June 25, 2016 and $428 at December 26, 2015, respectively	$	(443	)	$	(483	)
Cumulative translation adjustments	(220		)	(1,739		)
Accumulated other comprehensive loss	$	(663	)	$	(2,222	)

Stockholders' Equity (Tables)

6 Months Ended

Jun. 25, 2016

Stockholders' Equity Note [Abstract]

Schedule of Restricted Stock Unit Activity

Restricted stock unit (RSU) activity under our equity incentive plan during the six months ended June 25, 2016 is set forth below:



	Units		Weighted Average Grant Date Fair Value
Restricted stock units at December 26, 2015	2,578,138		$	7.63
Awards granted	920,044		4.53
Awards vested	(1,416,349	)	7.03
Awards canceled	(97,500	)	5.51
Restricted stock units at June 25, 2016	1,984,333		$	6.72

Schedule of Weighted Average Assumptions

The following weighted average assumptions were used in the estimated grant-date fair value calculations using the Black-Scholes option pricing model:



Stock Options:
Dividend yield	—	%
Expected volatility	47.5	%
Risk-free interest rate	1.57	%
Expected term (in years)	5.52

Stock-Based Compensation (Tables)

6 Months Ended

Jun. 25, 2016

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

Schedule of Share-based Compensation Charges

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



	Three Months Ended				Six Months Ended
	June 25, 2016		June 27, 2015		June 25, 2016		June 27, 2015
Stock-based compensation included in:
Cost of revenues	$	405	$	602	$	1,038	$	1,185
Research and development	542		726		1,338		1,571
Selling, general and administrative	594		1,178		1,899		2,659
Total stock-based compensation	1,541		2,506		4,275		5,415
Tax effect of stock-based compensation	—		—		—		—
Total stock-based compensation, net of tax	$	1,541	$	2,506	$	4,275	$	5,415

Schedule of Weighted-Average Assumptions

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



	Six Months Ended
	June 25, 2016		June 27, 2015
ESPP:
Dividend yield	—	%	—	%
Expected volatility	45.3	%	51.7	%
Risk-free interest rate	0.40	%	0.08	%
Expected term (in years)	0.50		1.00

Schedule of Unrecognized Compensation Costs

At June 25, 2016, the unrecognized stock-based compensation, adjusted for estimated forfeitures, was as follows (in thousands):



	Unrecognized Expense		Average Expected Recognition Period in years
Stock options	$	1,430	2.51
Restricted stock units	10,994		2.78
Employee stock purchase plan	84		0.10
Total unrecognized stock-based compensation expense	$	12,508

Net Income per Share (Tables)

6 Months Ended

Jun. 25, 2016

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 income per share is as follows (in thousands):



	Three Months Ended				Six Months Ended
	June 25, 2016		June 27, 2015		June 25, 2016		June 27, 2015
Numerator:
Net income used in computing basic and diluted net income per share	$	36,884	$	838	$	23,084	$	1,621
Denominator:
Weighted-average shares used in computing basic net income per share	59,572		58,109		59,001		57,532
Add potentially dilutive securities	416		985		638		1,342
Weighted-average shares used in computing basic and diluted net income per share	59,988		59,094		59,639		58,874

Summary of Anti-dilutive Securities Excluded from Computation of Earnings Per Share

The following securities were excluded from the calculation of diluted net income per share because their effect would have been anti-dilutive for the periods presented (in thousands):



	Three Months Ended		Six Months Ended
	June 25, 2016	June 27, 2015	June 25, 2016	June 27, 2015
Options to purchase common stock	2,255	1,948	1,809	2,059
Restricted stock units	4	—	—	197
Total potentially dilutive securities	2,259	1,948	1,809	2,256

Commitments and Contingencies (Tables)

6 Months Ended

Jun. 25, 2016

Commitments and Contingencies Disclosure [Abstract]

Schedule of Lease and Purchase Obligations



	Remainder of 2016		2017-2018		2019-2020		2021 and Beyond		Total
	(In thousands)
Operating leases	$	1,225	$	4,091	$	1,868	$	384	$	7,568
Purchase order commitments obligations (1)	5,227		169		—		—		5,396
Total	$	6,452	$	4,260	$	1,868	$	384	$	12,964



(1)	Purchase order commitments primarily represent open orders for inventory and capital expenditures.



	Remainder of 2016		2017-2018		2019-2020		2021		Total
	(In thousands)
Principal payments	$	5,625	$	39,375	$	91,875	$	13,125	$	150,000
Interest payments*	1,613		5,339		2,765		65		9,782
Total	$	7,238	$	44,714	$	94,640	$	13,190	$	159,782

* Represents our minimum interest payment commitments at 2.00% per annum

Derivative Financial Instruments (Tables)

6 Months Ended

Jun. 25, 2016

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Foreign Currency Forward Contracts Outstanding

The following table provides information about our foreign currency forward contracts outstanding as of June 25, 2016 (in thousands):



Currency	Contract Position	Contract Amount (Local Currency)		Contract Amount (U.S. Dollars)
Japanese Yen	Buy	(629,473	)	$	(6,173	)
Taiwan Dollar	Buy	(36,695	)	(1,137		)
Korean Won	Buy	(1,528,806	)	(1,350		)
Euro	Buy	(2,200	)	(2,525		)
Euro	Sell	1,099		1,245
Euro	Sell	17,011		19,406
Japanese Yen	Sell	179,263		1,661
Japanese Yen	Sell	140,000		1,256
Total USD notional amount of outstanding foreign exchange contracts				$	12,383

Schedule of Gains (Losses) Related to Non-designated Derivative Instruments



		Amount of Gain (Loss) Recognized on Derivatives
		Three Months Ended					Six Months Ended
Derivatives Not Designated as Hedging Instruments	Location of Gain (Loss) Recognized on Derivatives	June 25, 2016			June 27, 2015			June 25, 2016			June 27, 2015
Foreign exchange forward contracts	Other income (expense), net	$	(141	)	$	847		$	(1,703	)	$	685

Operating Segments (Tables)

6 Months Ended

Jun. 25, 2016

Segment Reporting [Abstract]

Schedule of Operating Results by Segment

The following table summarizes the operating results by reportable segments for the three months ended June 25, 2016 (in thousands):



	Probes			Systems		Total

Revenues	$	83,083		$	—	$	83,083
Operating loss	(6,646		)	—		(6,646		)

Concentration of Credit and Other Risks (Details) - Customer Concentration Risk - Customer	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 25, 2016	Jun. 27, 2015	Jun. 25, 2016	Jun. 27, 2015	Dec. 26, 2015
Revenues
Concentration Risk [Line Items]
Concentration risk percentage	59.30%	61.00%	50.90%	60.70%
Revenues \| Intel
Concentration Risk [Line Items]
Concentration risk percentage	44.10%	17.10%	40.20%	17.80%
Revenues \| SK hynix
Concentration Risk [Line Items]
Concentration risk percentage	15.20%	13.00%	10.70%	15.20%
Revenues \| Samsung
Concentration Risk [Line Items]
Concentration risk percentage		13.10%		13.40%
Revenues \| Micron
Concentration Risk [Line Items]
Concentration risk percentage		17.80%		14.30%
Accounts Receivable \| Major Customer 1
Concentration Risk [Line Items]
Concentration risk percentage			36.00%		29.00%
Number of major customers			1		1

Acquisition - Additional Information (Details)		3 Months Ended		6 Months Ended
Acquisition - Additional Information (Details)	Jun. 24, 2016 USD ($) $ / shares shares	Jun. 25, 2016 USD ($)	Jun. 27, 2015 USD ($)	Jun. 25, 2016 USD ($)	Jun. 27, 2015 USD ($)
Deferred Tax Asset Valuation Allowance
Business Acquisition [Line Items]
Net Income (loss)				$ 43,900,000
Acquisition-related Transaction Costs
Business Acquisition [Line Items]
Net Income (loss)				(13,800,000)
Restructuring Charges
Business Acquisition [Line Items]
Net Income (loss)				(6,900,000)
Cascade Microtech
Business Acquisition [Line Items]
Cash paid to acquire business (In dollars per share) \| $ / shares	$ 16.00
Fraction of parent shares issued per share of acquiree (in shares)	0.6534
Total acquisition consideration	$ 325,100,000
Cash acquired in combination	$ 40,681,000
Total stock issued to acquire business (in shares) \| shares	10,450,189
Market value of hares issued in acquisition, amount	$ 93,200,000
Transaction costs related to acquisition		$ 2,100,000		3,800,000
Net Income (loss)		$ 3,596,000	$ (20,868,000)	$ (10,112,000)	$ 14,386,000
Cascade Microtech \| Senior Secured Term Loan
Business Acquisition [Line Items]
Senior secured loan to finance merger	$ 150,000,000
Cascade Microtech \| FormFactor
Business Acquisition [Line Items]
Closing stock price (in dollars per share) \| $ / shares	$ 8.92
Cascade Microtech \| Common Stock
Business Acquisition [Line Items]
Value of stock issued in conversion of unvested equity awards	$ 3,900,000
Cascade Microtech \| Stock options
Business Acquisition [Line Items]
Amount over exercise price for shares converted in acquisition (in dollars per share) \| $ / shares	$ 21.47
Options granted during the period (in shares) \| shares	152,276
Cascade Microtech \| Restricted Stock Units
Business Acquisition [Line Items]
Amount over exercise price for shares converted in acquisition (in dollars per share) \| $ / shares	$ 21.47
Equity awards granted during period (in shares) \| shares	777,444
Cascade Microtech \| Former Shareholders of Cascade Microtech
Business Acquisition [Line Items]
Cash paid in acquisition	$ 255,900,000
Cascade Microtech \| Vested Equity Award Holders
Business Acquisition [Line Items]
Cash paid in acquisition	12,800,000
Developed technologies \| Cascade Microtech
Business Acquisition [Line Items]
Finite-lived intangible assets acquired	91,100,000
Customer relationships \| Cascade Microtech
Business Acquisition [Line Items]
Finite-lived intangible assets acquired	23,153,000
Trade name \| Cascade Microtech
Business Acquisition [Line Items]
Finite-lived intangible assets acquired	7,600,000
In-process research and development \| Cascade Microtech
Business Acquisition [Line Items]
Indefinite-lived intangible assets acquired	$ 12,400,000

Acquisition - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Jun. 25, 2016	Jun. 24, 2016	Dec. 26, 2015
Business Acquisition [Line Items]
Goodwill	$ 188,517		$ 30,731
Cascade Microtech
Business Acquisition [Line Items]
Cash and cash equivalents		$ 40,681
Accounts receivable		27,112
Inventory		35,915
Prepaid expenses and other current assets		6,249
Property, plant and equipment		19,875
Other long-term assets		818
Deferred revenue		(1,829)
Accounts payable and accrued liabilities		(22,901)
Deferred tax liabilities		(43,344)
Other long-term liabilities		(6,623)
Total tangible assets acquired and liabilities assumed		55,953
Intangible assets		152,053
Goodwill		157,786
Total acquisition price		$ 365,792

Acquisition - Intangible Assets Acquired (Details) - USD ($) $ in Thousands		6 Months Ended
	Jun. 24, 2016	Jun. 25, 2016
Cascade Microtech
Business Acquisition [Line Items]
Total intangible assets	$ 152,053
In-process research and development \| Cascade Microtech
Business Acquisition [Line Items]
Indefinite-lived intangible assets acquired	12,400
Developed technologies \| Cascade Microtech
Business Acquisition [Line Items]
Finite-lived intangible assets acquired	$ 91,100
Estimated useful life of intangible assets acquired	5 years 3 months 6 days
Customer relationships
Business Acquisition [Line Items]
Estimated useful life of intangible assets acquired		6 years 3 months 6 days
Customer relationships \| Cascade Microtech
Business Acquisition [Line Items]
Finite-lived intangible assets acquired	$ 23,153
Estimated useful life of intangible assets acquired	7 years 6 days
Order backlog
Business Acquisition [Line Items]
Estimated useful life of intangible assets acquired		8 months 6 days
Order backlog \| Cascade Microtech
Business Acquisition [Line Items]
Finite-lived intangible assets acquired	$ 17,800
Estimated useful life of intangible assets acquired	8 months 6 days
Trade name
Business Acquisition [Line Items]
Estimated useful life of intangible assets acquired		4 years 4 months 8 days
Trade name \| Cascade Microtech
Business Acquisition [Line Items]
Finite-lived intangible assets acquired	$ 7,600
Estimated useful life of intangible assets acquired	3 years 8 months 6 days

Acquisition - Pro Forma Information (Details) - Cascade Microtech - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 25, 2016	Jun. 27, 2015	Jun. 25, 2016	Jun. 27, 2015
Business Acquisition [Line Items]
Revenues	$ 120,112	$ 109,929	$ 208,526	$ 212,500
Net Income (loss)	$ 3,596	$ (20,868)	$ (10,112)	$ 14,386
Net loss per share - basic (in dollars per share)	$ 0.05	$ (0.30)	$ (0.15)	$ 0.21
Net loss per share - diluted (in dollars per share)	$ 0.05	$ (0.30)	$ (0.14)	$ 0.21

Goodwill and Intangible Assets - Intangible Assets (Details) $ in Thousands	6 Months Ended
	Jun. 25, 2016 USD ($)	Dec. 26, 2015 USD ($)
Finite-lived Intangible Assets [Roll Forward]
Finite-lived intangible assets, gross amount, beginning balance	$ 73,588
Finite-lived intangible assets acquired	139,653
Finite-lived intangible assets, gross amount, ending balance	213,241
Accumulated amortization, beginning balance	48,036
Expense, net	5,459
Accumulated amortization, ending balance	53,495
Intangible Assets, Net	159,746	$ 25,552
Total intangible assets, gross amount, beginning balance	73,588
Finite and indefinite-lived intangible assets acquired	152,053
Total intangible assets, gross amount, ending balance	225,641
Total Intangible Assets, Net	172,146	25,552
In-process research and development
Indefinite-lived Intangible Assets [Roll Forward]
Indefinite-lived intangible assets, gross amount, beginning balance	0
Indefinite-lived intangible asset additions	12,400
Indefinite-lived intangible assets, gross amount, ending balance	12,400
Existing developed technologies
Finite-lived Intangible Assets [Roll Forward]
Finite-lived intangible assets, gross amount, beginning balance	52,200
Finite-lived intangible assets acquired	91,100
Finite-lived intangible assets, gross amount, ending balance	143,300
Accumulated amortization, beginning balance	39,581
Expense, net	4,158
Accumulated amortization, ending balance	43,739
Intangible Assets, Net	$ 99,561	12,619
Weighted Average Useful Life	5 years 1 month 6 days
Trade name
Finite-lived Intangible Assets [Roll Forward]
Finite-lived intangible assets, gross amount, beginning balance	$ 4,388
Finite-lived intangible assets acquired	7,600
Finite-lived intangible assets, gross amount, ending balance	11,988
Accumulated amortization, beginning balance	1,409
Expense, net	219
Accumulated amortization, ending balance	1,628
Intangible Assets, Net	$ 10,360	2,979
Weighted Average Useful Life	4 years 4 months 8 days
Customer relationships
Finite-lived Intangible Assets [Roll Forward]
Finite-lived intangible assets, gross amount, beginning balance	$ 17,000
Finite-lived intangible assets acquired	23,153
Finite-lived intangible assets, gross amount, ending balance	40,153
Accumulated amortization, beginning balance	7,046
Expense, net	1,082
Accumulated amortization, ending balance	8,128
Intangible Assets, Net	$ 32,025	$ 9,954
Weighted Average Useful Life	6 years 3 months 6 days
Order backlog
Finite-lived Intangible Assets [Roll Forward]
Finite-lived intangible assets acquired	$ 17,800
Finite-lived intangible assets, gross amount, ending balance	17,800
Intangible Assets, Net	$ 17,800
Weighted Average Useful Life	8 months 6 days

Goodwill and Intangible Assets - Amortization Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 25, 2016	Jun. 27, 2015	Jun. 25, 2016	Jun. 27, 2015	Dec. 26, 2015
Property, Plant and Equipment [Line Items]
Amortization of intangible assets			$ 5,459
Finite-Lived Intangible Assets, Net, Amortization Expense, Rolling Maturity [Abstract]
2016	$ 22,023		22,023
2017	32,913		32,913
2018	30,243		30,243
2019	27,675		27,675
2020	24,129		24,129
and thereafter	22,763		22,763
Intangible Assets, Net	159,746		159,746		$ 25,552
Cost of Sales
Property, Plant and Equipment [Line Items]
Amortization of intangible assets	2,100	$ 2,600	4,200	$ 5,200
Selling, general and administrative
Property, Plant and Equipment [Line Items]
Amortization of intangible assets	$ 600	$ 700	$ 1,300	$ 1,300

Goodwill and Intangible Assets - Goodwill (Details) $ in Thousands	6 Months Ended
	Jun. 25, 2016 USD ($)
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 30,731
Additions-Cascade Microtech	157,786
Goodwill, ending balance	188,517
MicroProbe Inc.
Goodwill [Roll Forward]
Goodwill, beginning balance	30,700
Goodwill, ending balance	30,700
Probes
Goodwill [Roll Forward]
Goodwill, beginning balance	30,731
Additions-Cascade Microtech	141,496
Goodwill, ending balance	172,227
Systems
Goodwill [Roll Forward]
Goodwill, beginning balance	0
Additions-Cascade Microtech	16,290
Goodwill, ending balance	$ 16,290

Debt - Schedule of Long-term Debt (Details) $ in Thousands	Jun. 25, 2016 USD ($)
Debt Disclosure [Abstract]
Principal amount	$ 150,000
Less debt issuance costs	(1,506)
Long-term debt less debt issuance costs	$ 148,494

Debt - Additional Information (Details)		6 Months Ended
Debt - Additional Information (Details)	Jun. 24, 2016 USD ($)	Jun. 25, 2016
Debt Instrument [Line Items]
Debt to earnings ratio, in year one		2.75
Debt to earnings ratio, in year two		2.50
Minimum fixed charge coverage ratio in years one and two		1.50
Minimum fixed charge coverage ratio in year three		1.30
Minimum fixed charge coverage ratio, in year four and thereafter		1.20
Senior Secured Term Loan
Debt Instrument [Line Items]
Debt principal payable in current year, percentage		5.00%
Debt principal payable in year two, percentage		10.00%
Debt principal payable in year three, percentage		20.00%
Debt principal payable in year four, percentage		30.00%
Debt principal payable in year five, percentage		35.00%
Senior Secured Term Loan \| London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Stated debt interest rate	2.00%
Senior Secured Term Loan \| Base Rate
Debt Instrument [Line Items]
Stated debt interest rate	1.00%
Senior Secured Term Loan \| Cascade Microtech
Debt Instrument [Line Items]
Senior secured loan to finance merger	$ 150,000,000

Restructuring Charges - Additional Information (Details) - USD ($)	3 Months Ended			6 Months Ended
	Jun. 25, 2016	Mar. 26, 2016	Jun. 27, 2015	Jun. 25, 2016	Jun. 27, 2015
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 0		$ 6,910,000	$ 500,000
Share-based compensation expense	$ 1,541,000		$ 2,506,000	4,275,000	5,415,000
Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring charges	500,000			5,946,000	0
Stock-based Compensation
Restructuring Cost and Reserve [Line Items]
Restructuring charges				964,000	$ 500,000
Share-based compensation expense				300,000
Cascade Microtech \| Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 5,400,000
Cascade Microtech \| Stock-based Compensation
Restructuring Cost and Reserve [Line Items]
Restructuring charges				$ 700,000

Restructuring Charges - Restructuring Accrual Activity (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 25, 2016	Mar. 26, 2016	Jun. 25, 2016	Jun. 27, 2015
Restructuring Reserve [Roll Forward]
Accrual at beginning of period		$ 2,000	$ 2,000	$ 584,000
Restructuring charges		0	6,910,000	500,000
Cash payments			(2,000)	(569,000)
Adjustment to restructuring charges				3,000
Non-cash settlement			(964,000)	(500,000)
Accrual at end of period	$ 5,946,000		5,946,000	18,000
Employee Severance and Benefits
Restructuring Reserve [Roll Forward]
Accrual at beginning of period		2,000	2,000	584,000
Restructuring charges	500,000		5,946,000	0
Cash payments			(2,000)	(569,000)
Adjustment to restructuring charges				3,000
Non-cash settlement			0	0
Accrual at end of period	5,946,000		5,946,000	18,000
Stock-based Compensation
Restructuring Reserve [Roll Forward]
Accrual at beginning of period		$ 0	0	0
Restructuring charges			964,000	500,000
Cash payments			0	0
Adjustment to restructuring charges				0
Non-cash settlement			(964,000)	(500,000)
Accrual at end of period	$ 0		$ 0	$ 0

Fair Value (Details) - USD ($) $ in Thousands	Jun. 25, 2016	Dec. 26, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable securities	$ 18,108	$ 41,325
Foreign exchange derivative contracts	317
Total assets measured at fair value	37,119	124,260
Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Foreign exchange derivative contracts	0
Total assets measured at fair value	18,694	82,935
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Foreign exchange derivative contracts	317
Total assets measured at fair value	18,425	41,325
Money market funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	18,694	82,935
Money market funds \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	18,694	82,935
Money market funds \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	0	0
U.S. Treasuries
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable securities	7,507	18,853
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	7,507	18,853
Agency securities (Federal)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable securities	10,601	22,472
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	$ 10,601	$ 22,472

Marketable Securities (Details) - USD ($) $ in Thousands	Jun. 25, 2016	Dec. 26, 2015
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 18,100	$ 41,380
Gross Unrealized Gains	9	1
Gross Unrealized Losses	(1)	(56)
Fair Value	18,108	41,325
Amortized Cost
Due in one year or less	10,602
Due after one year to five years	7,498
Amortized Cost	18,100
Fair Value
Due in one year or less	10,601
Due after one year to five years	7,507
Fair Value	18,108
U.S. Treasuries
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	7,498	18,896
Gross Unrealized Gains	9	1
Gross Unrealized Losses	0	(44)
Fair Value	7,507	18,853
Agency securities (Federal)
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	10,602	22,484
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(1)	(12)
Fair Value	$ 10,601	$ 22,472

Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 25, 2016	Jun. 27, 2015
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance at beginning of period	$ 284	$ 266
Reductions	(34)	(11)
Balance at end of period	$ 250	$ 255

Inventories (Details) - USD ($) $ in Thousands	Jun. 25, 2016	Dec. 26, 2015
Inventory Disclosure [Abstract]
Raw materials	$ 27,580	$ 12,996
Work-in-progress	24,522	12,492
Finished goods	16,255	1,735
Inventory, Net	$ 68,357	$ 27,223

Warranty (Details) - USD ($) $ in Thousands	6 Months Ended
Warranty (Details) - USD ($) $ in Thousands	Jun. 25, 2016	Jun. 27, 2015
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]
Balance at beginning of period	$ 1,116	$ 1,592
Accruals	2,054	828
Settlements	(1,693)	(1,338)
Balance at the end of period	1,477	1,082
Add warranty reserve from acquisition-Cascade Microtech	795	0
Balance at the end of period	$ 2,272	$ 1,082

Long-lived Assets - Additional Information (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 25, 2016	Jun. 27, 2015
Property, Plant and Equipment [Abstract]
Cost of fully depreciated assets	$ 1.1	$ 0.4

Long-lived Assets - Schedule of Property, Plant, and Equipment (Details) - USD ($) $ in Thousands	Jun. 25, 2016	Dec. 26, 2015
Property, Plant and Equipment [Line Items]
Long-lived assets, gross	$ 273,245	$ 251,435
Less: accumulated depreciation and amortization	(236,665)	(232,005)
Net long-lived assets	36,580	19,430
Construction-in-progress	7,211	4,423
Total property, plant, and equipment	43,791	23,853
Machinery and equipment
Property, Plant and Equipment [Line Items]
Long-lived assets, gross	164,310	150,983
Computer equipment and software
Property, Plant and Equipment [Line Items]
Long-lived assets, gross	29,923	27,951
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Long-lived assets, gross	5,980	5,380
Leasehold improvements
Property, Plant and Equipment [Line Items]
Long-lived assets, gross	$ 73,032	$ 67,121

Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	Jun. 25, 2016	Dec. 26, 2015
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Unrealized loss on marketable securities, net of tax of $405 at June 25, 2016 and $428 at December 26, 2015, respectively	$ (443)	$ (483)
Cumulative translation adjustments	(220)	(1,739)
Accumulated other comprehensive loss	(663)	(2,222)
Unrealized loss on marketable securities, tax	$ 405	$ 428

Stockholders' Equity - Additional Information (Details)					3 Months Ended		5 Months Ended	6 Months Ended
Stockholders' Equity - Additional Information (Details)	Jun. 24, 2016 USD ($) shares	May 02, 2016 USD ($) shares	May 28, 2015 USD ($) executive shares	May 05, 2014 shares	Jun. 25, 2016 USD ($)	Jun. 27, 2015 USD ($)	Jun. 23, 2016 USD ($)	Jun. 25, 2016 USD ($) shares	Jun. 27, 2015 USD ($) shares	Apr. 16, 2015 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense					$ 1,541,000	$ 2,506,000		$ 4,275,000	$ 5,415,000
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of recipients \| executive			7
Awards vested (in shares) \| shares				328,600
Share-based compensation expense		$ 300,000	$ 1,500,000
Stock issued during the period for equity awards (in shares) \| shares		40,000	195,000	350,000
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense									$ 1,700,000
Options granted during period (in shares) \| shares									450,000
Equity Incentive Plan \| Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards vested (in shares) \| shares								1,416,349
Total fair value of restricted stock units vested during the period					$ 6,400,000	$ 10,000,000		$ 10,400,000	$ 17,500,000
Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase program authorized amount										$ 25,000,000.0
Cascade Microtech \| Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity awards granted during period (in shares) \| shares	777,444
Total grant date fair value	$ 6,900,000
Total grant date fair value, unvested units	$ 3,600,000
Cascade Microtech \| Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense							$ 300,000
Options granted during the period (in shares) \| shares	152,276
Grant date fair value of awards granted	$ 800,000

Stockholders' Equity - Restricted Stock Unit Activity (Details) - Restricted Stock Units - $ / shares		6 Months Ended
	May 05, 2014	Jun. 25, 2016
Units
Awards vested (in shares)	(328,600)
Equity Incentive Plan
Units
Beginning balance (in shares)		2,578,138
Awards granted (in shares)		920,044
Awards vested (in shares)		(1,416,349)
Awards canceled (in shares)		(97,500)
Ending balance (in shares)		1,984,333
Weighted Average Grant Date Fair Value
Beginning Balance (in dollars per share)		$ 7.63
Awards granted (in dollars per share)		4.53
Awards vested (in dollars per share)		7.03
Awards canceled (in dollars per share)		5.51
Ending Balance (in dollars per share)		$ 6.72

Stockholders' Equity - Weighted Average Assumptions (Details) - Stock options	6 Months Ended
	Jun. 27, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield	0.00%
Expected volatility	47.50%
Risk-free interest rate	1.57%
Expected term	5 years 6 months 6 days

Stock-Based Compensation - Additional Information (Details) - USD ($)	3 Months Ended			6 Months Ended
	Jun. 25, 2016	Mar. 26, 2016	Jun. 27, 2015	Jun. 25, 2016	Jun. 27, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 1,541,000		$ 2,506,000	$ 4,275,000	$ 5,415,000
Restructuring charges		$ 0		$ 6,910,000	$ 500,000
Employee stock purchase plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Purchase price of common stock, percent of market value				85.00%
Stock issued during the period (In shares)	0		0	303,585	302,705
Stock-based Compensation
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense				$ 300,000
Restructuring charges				964,000	$ 500,000
Cascade Microtech \| Stock-based Compensation
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restructuring charges				$ 700,000

Stock-Based Compensation - Share-Based Compensation Charges (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 25, 2016	Jun. 27, 2015	Jun. 25, 2016	Jun. 27, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation	$ 1,541	$ 2,506	$ 4,275	$ 5,415
Tax effect of stock-based compensation	0	0	0	0
Total stock-based compensation, net of tax	1,541	2,506	4,275	5,415
Cost of revenues
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation	405	602	1,038	1,185
Research and development
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation	542	726	1,338	1,571
Selling, general and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation	$ 594	$ 1,178	$ 1,899	$ 2,659

Stock-Based Compensation - Weighted Average Assumptions (Details) - Employee stock purchase plan	6 Months Ended
	Jun. 25, 2016	Jun. 27, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield	0.00%	0.00%
Expected volatility	45.30%	51.70%
Risk-free interest rate	0.40%	0.08%
Expected term	6 months	12 months

Stock-Based Compensation - Unrecognized Compensation Costs (Details) $ in Thousands	6 Months Ended
	Jun. 25, 2016 USD ($)
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized [Abstract]
Total unrecognized stock-based compensation expense	$ 12,508
Stock options
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized [Abstract]
Stock options	$ 1,430
Average Expected Recognition Period	2 years 6 months 4 days
Restricted stock units
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized [Abstract]
Restricted stock units and employee stock purchase plan	$ 10,994
Average Expected Recognition Period	2 years 9 months 10 days
Employee stock purchase plan
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized [Abstract]
Restricted stock units and employee stock purchase plan	$ 84
Average Expected Recognition Period	1 month 6 days

Net Income per Share - Schedule of Numerator and Denominator in EPS (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 25, 2016	Jun. 27, 2015	Jun. 25, 2016	Jun. 27, 2015
Numerator:
Net income used in computing basic and diluted net income per share	$ 36,884	$ 838	$ 23,084	$ 1,621
Denominator:
Weighted-average shares used in computing basic net income per share (In shares)	59,572	58,109	59,001	57,532
Add potentially dilutive securities (In shares)	416	985	638	1,342
Weighted-average shares used in computing basic and diluted net income per share (In shares)	59,988	59,094	59,639	58,874

Net Income per Share - Anti-dilutive Securities Excluded from EPS (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 25, 2016	Jun. 27, 2015	Jun. 25, 2016	Jun. 27, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities (In shares)	2,259	1,948	1,809	2,256
Options to purchase common stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities (In shares)	2,255	1,948	1,809	2,059
Restricted stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities (In shares)	4	0	0	197

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Income Taxes (Details) - USD ($) $ in Thousands	Jun. 25, 2016	Jun. 27, 2015	Jun. 25, 2016	Jun. 27, 2015
Income Tax Disclosure [Abstract]
Income tax provision (benefit)	$ (43,744)	$ 24	$ (43,714)	$ 145
Cascade Microtech
Business Acquisition [Line Items]
Net deferred tax liability	$ 43,900		43,900
Decrease in deferred tax asset valuation allowance			$ 43,900

Commitments and Contingencies (Details) $ in Thousands	Jun. 25, 2016 USD ($)
Operating leases
Remainder of 2016	$ 1,225
2017-2018	4,091
2019-2020	1,868
2021 and Beyond	384
Total operating leases due	7,568
Purchase order commitments obligations
Remainder of 2016	5,227
2017-2018	169
2019-2020	0
2021 and Beyond	0
Total purchase order obligations due	5,396
Total Contractual Obligations
Remainder of 2016	6,452
2017-2018	4,260
2019-2020	1,868
2021 and Beyond	384
Total contractual obligations due	12,964
Principal payments, Remainder of 2016	5,625
Principal payments, 2017-2018	39,375
Principal payments, 2019-2020	91,875
Principal payments, 2021	13,125
Long-term debt less debt issuance costs	150,000
Interest payments, Remainder of 2016	1,613
Interest payments, 2017-2018	5,339
Interest payments, 2019-2020	2,765
Interest payments, 2021	65
Interest payments, Total	9,782
Total debt repayments, Remainder of 2016	7,238
Total debt repayments, 2017-2018	44,714
Total debt repayments, 2019-2020	94,640
Total debt repayments, 2021	13,190
Total debt repayments	$ 159,782
Minimum interest payment commitment	2.00%

Derivative Financial Instruments - Foreign Currency Forward Contracts Outstanding (Details) - Jun. 25, 2016 - Not Designated as Hedging Instrument - Foreign Exchange Forward € in Thousands, ₩ in Thousands, ¥ in Thousands, $ in Thousands, $ in Thousands	USD ($)	TWD ($)	KRW (₩)	EUR (€)	JPY (¥)
Derivatives, Fair Value [Line Items]
Total USD notional amount of outstanding foreign exchange contracts	$ 12,383
Buy \| Japanese Yen
Derivatives, Fair Value [Line Items]
Derivative liability contract amount	(6,173)				¥ (629,473)
Buy \| Taiwan Dollar
Derivatives, Fair Value [Line Items]
Derivative liability contract amount	(1,137)	$ (36,695)
Buy \| Korean Won
Derivatives, Fair Value [Line Items]
Derivative liability contract amount	(1,350)		₩ (1,528,806)
Buy \| Euro
Derivatives, Fair Value [Line Items]
Derivative liability contract amount	(2,525)			€ (2,200)
Sell \| Japanese Yen
Derivatives, Fair Value [Line Items]
Derivative asset contract amount	1,661				179,263
Sell \| Japanese Yen
Derivatives, Fair Value [Line Items]
Derivative asset contract amount	1,256				¥ 140,000
Sell \| Euro
Derivatives, Fair Value [Line Items]
Derivative asset contract amount	1,245			1,099
Sell \| Euro
Derivatives, Fair Value [Line Items]
Derivative asset contract amount	$ 19,406			€ 17,011

Derivative Financial Instruments - Additional Information (Details) $ in Millions	6 Months Ended
	Jun. 25, 2016 USD ($)
Not Designated as Hedging Instrument \| Cascade Microtech
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gain on foreign currency contracts	$ 0.3

Derivative Financial Instruments - Losses Related to Non-designated Derivative Instruments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 25, 2016	Jun. 27, 2015	Jun. 25, 2016	Jun. 27, 2015
Not Designated as Hedging Instrument \| Foreign Exchange Forward \| Other income (expense), net
Derivatives, Fair Value [Line Items]
Foreign exchange forward contracts	$ (141)	$ 847	$ (1,703)	$ 685

Operating Segments - Additional Information (Details)	6 Months Ended
Operating Segments - Additional Information (Details)	Jun. 25, 2016 segment
Segment Reporting [Abstract]
Number of reportable segments	2
Number of operating segments	4

Operating Segments - Operating Results by Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 25, 2016	Jun. 27, 2015	Jun. 25, 2016	Jun. 27, 2015
Segment Reporting Information [Line Items]
Revenues	$ 83,083	$ 73,885	$ 136,694	$ 144,714
Operating loss	(6,646)	$ 697	$ (20,219)	$ 15
Probes
Segment Reporting Information [Line Items]
Revenues	83,083
Operating loss	(6,646)
Systems
Segment Reporting Information [Line Items]
Revenues	0
Operating loss	$ 0

Business Interruption Insurance Claim Recovery (Details) $ in Millions	6 Months Ended
	Jun. 27, 2015 USD ($)
Other income (expense), net
Business Interruption Loss [Line Items]
Proceeds from business interruption insurance claim	$ 1.5