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Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Mar. 30, 2019	May 01, 2019
Document and Entity Information [Abstract]
Entity Registrant Name	FORMFACTOR INC.
Entity Central Index Key	0001039399
Current Fiscal Year End Date	--12-28
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Mar. 30, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Common Stock, Shares Outstanding		74,581,339

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 30, 2019	Dec. 29, 2018
Current assets:
Cash and cash equivalents	$ 105,759	$ 98,472
Marketable securities	54,086	50,531
Accounts receivable, net of allowance for doubtful accounts of $185 and $185	81,492	95,333
Inventories, net	83,216	77,706
Restricted cash	824	849
Refundable income taxes	1,261	1,260
Prepaid expenses and other current assets	11,747	13,669
Total current assets	338,385	337,820
Restricted cash	1,130	1,225
Operating Lease, Right-of-Use Asset	34,397	0
Property, plant and equipment, net of accumulated depreciation of $266,274 and $263,102	54,697	54,054
Goodwill	188,925	189,214
Intangibles, net	60,385	67,640
Deferred tax assets	77,293	77,301
Other assets	1,409	968
Total assets	756,621	728,222
Current liabilities:
Accounts payable	31,555	40,006
Accrued liabilities	22,559	27,731
Current portion of term loan, net of unamortized issuance cost of $128 and $160	33,622	29,840
Deferred revenue	6,885	4,941
Operating Lease, Liability, Current	6,022	0
Total current liabilities	100,643	102,518
Long-term income taxes payable	23,740	34,971
Deferred tax liabilities	2,306	2,355
Operating Lease, Liability, Noncurrent	32,239	0
Other liabilities	4,705	8,214
Total liabilities	163,633	148,058
Stockholders’ equity:
Preferred stock, $0.001 par value: 10,000,000 shares authorized; no shares issued and outstanding	0	0
Common stock, $0.001 par value: 250,000,000 shares authorized; 74,101,623 and 72,532,176 shares issued and outstanding	74	74
Additional paid-in capital	871,617	862,897
Accumulated other comprehensive income (loss)	(599)	780
Accumulated deficit	(278,104)	(283,587)
Total stockholders’ equity	592,988	580,164
Total liabilities and stockholders’ equity	$ 756,621	$ 728,222

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 30, 2019	Dec. 29, 2018
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 200	$ 200
Accumulated depreciation	260,607	255,755
Debt Issuance Costs, Current, Net	189	307
Debt Issuance Costs, Noncurrent, Net	$ 57	$ 272
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)	74,101,623	72,532,176
Common stock, shares outstanding (In shares)	74,101,623	72,532,176

Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended	9 Months Ended
	Mar. 30, 2019	Sep. 30, 2017
Income Statement [Abstract]
Revenues	$ 132,213	$ 118,290
Cost of revenues	79,692	73,161
Gross profit	52,521	45,129
Operating expenses:
Research and development	19,723	18,046
Selling, general and administrative	25,184	23,449
Total operating expenses	44,907	41,495
Operating income	7,614	3,634
Interest income	580	257
Interest expense	(595)	(967)
Other expense, net	(84)	(512)
Income before income taxes	7,515	2,412
Provision for income taxes	2,032	$ 287
Net income	$ 5,483
Net income per share:
Basic (In dollars per share)	$ 0.07	$ 0.03
Diluted (In dollars per share)	$ 0.07	$ 0.03
Basic
Basic (In shares)	74,362	72,826
Diluted (In shares)	76,009

Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Mar. 30, 2019	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 5,483
Other comprehensive income (loss), net of tax:
Translation adjustments and other	(917)	$ 2,166
Unrealized gains (losses) on available-for-sale marketable securities	151	(174)
Unrealized gains (losses) on derivative instruments	(613)	172
Other comprehensive income (loss), net of tax	(1,379)	2,164
Comprehensive income	$ 4,104	$ 4,289

- Definition

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

+ References + Details

CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income	Accumulated Deficit
Beginning balance (In shares) at Dec. 30, 2017		72,532,176,000
Beginning balance at Dec. 30, 2017	$ 458,637	$ 73	$ 843,116	$ 3,021	$ (387,573)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock under the Employee Stock Purchase Plan (In shares)		341,670,000
Issuance of common stock under the Employee Stock Purchase Plan	3,705	$ 1	3,704
Issuance of common stock pursuant to exercise of options for cash (In shares)		105,610,000
Issuance of common stock pursuant to exercise of options for cash	1,049	$ 0	1,049
Issuance of common stock pursuant to vesting of restricted stock units (In shares)		34,386,000
Issuance of common stock pursuant to exercise of options for cash	(357)	$ 0	(357)
Purchase and retirement of common stock	3,737		3,737
Other Comprehensive Income (Loss), Net of Tax				2,164
Accounting standard adoptions and adjustments	(50)		0		(50)
Stock-based compensation
Net income	2,125				2,125
Ending balance (In shares) at Mar. 31, 2018		73,013,842,000
Ending balance at Mar. 31, 2018	$ 471,010	$ 74	851,249	5,185	(385,498)
Beginning balance (In shares) at Dec. 29, 2018	72,532,176	74,139,712,000
Beginning balance at Dec. 29, 2018	$ 580,164	$ 74	862,897	780	(283,587)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock under the Employee Stock Purchase Plan (In shares)		301,497,000
Issuance of common stock under the Employee Stock Purchase Plan	3,670	$ 0	3,670
Issuance of common stock pursuant to exercise of options for cash (In shares)		19,207,000
Issuance of common stock pursuant to exercise of options for cash	90		90
Issuance of common stock pursuant to vesting of restricted stock units (In shares)		28,082,000
Issuance of common stock pursuant to exercise of options for cash	(302)	$ 0	(302)
Purchase and retirement of common stock	5,262		5,262
Other Comprehensive Income (Loss), Net of Tax	(1,379)			(1,379)
Stock-based compensation
Other comprehensive income (loss)	151
Currency translation adjustments	(917)
Currency translation adjustments	(613)
Net income	$ 5,483				5,483
Ending balance (In shares) at Mar. 30, 2019	74,101,623	74,488,498,000
Ending balance at Mar. 30, 2019	$ 592,988	$ 74	$ 871,617	$ (599)	$ (278,104)

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2019	Mar. 31, 2018
Cash flows from operating activities:
Net income	$ 5,483	$ 2,125
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	3,947	3,525
Amortization	7,090	7,194
Amortization (accretion) of discount on investments	(71)	23
Amortization of operating lease, right-of-use assets	1,277	0
Stock-based compensation expense	5,295	3,756
Amortization of debt issuance costs	51	123
Deferred income tax provision	0	59
Provision for excess and obsolete inventories	2,725	2,045
Loss on disposal of long-lived assets	118	15
Loss on derivative instruments	59	0
Foreign currency transaction losses (gains)	121	(561)
Changes in assets and liabilities:
Accounts receivable	13,805	3,354
Inventories	(8,658)	(7,408)
Prepaid expenses and other current assets	2,167	(247)
Refundable income taxes	(1)	(52)
Other assets	(564)	662
Accounts payable	(7,148)	2,988
Accrued liabilities	(6,275)	(9,521)
Income tax payable	943	(829)
Other liabilities	33	2,515
Deferred revenues	1,931	(444)
Operating lease liabilities	(1,690)	0
Asset retirement obligations	20,638	9,322
Net cash provided by operating activities
Cash flows from investing activities:	(6,028)	(3,831)
Proceeds from sale of a subsidiary	28	20
Proceeds from sale of property, plant and equipment	(12,382)	(3,587)
Purchases of marketable securities	9,050	4,007
Net cash used in investing activities	(9,332)	(3,391)
Net cash used in investing activities
Cash flows from financing activities:	3,870	4,754
Purchase and retirement of common stock	(302)	(357)
Proceeds from term loan debt	(7,500)	(8,750)
Payment of term loan debt issuance costs	(3,932)	(4,353)
Net cash used in financing activities	(207)	1,078
Effect of exchange rate changes on cash, cash equivalents and restricted cash	7,167	2,656
Net increase in cash, cash equivalents and restricted cash	100,546	92,726
Cash, cash equivalents and restricted cash, beginning of period	107,713	95,382
Fair value of stock options and restricted stock-based awards assumed in connection with acquisition of Cascade Microtech
Change in accounts payable and accrued liabilities related to property, plant and equipment purchases	(1,253)	601
Operating lease, right-of-use assets obtained in exchange for lease obligations	35,713	0
Supplemental disclosure of cash flow information:
Cash paid for income taxes, net	1,082	771
Cash paid for interest	$ 302	$ 826

Basis of Presentation and New Accounting Pronouncements	3 Months Ended
Basis of Presentation and New Accounting Pronouncements	Mar. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation and New Accounting Pronouncements	Basis of Presentation and New Accounting Pronouncements Basis of Presentation The accompanying condensed consolidated financial information of FormFactor, Inc. is unaudited and has been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) and pursuant to the rules and regulations of the Securities and Exchange Commission. However, such information reflects all adjustments, consisting only of normal recurring adjustments, which are, in the opinion of management, necessary for a fair presentation of the financial position, results of operations and cash flows for the interim periods. The financial information as of December 29, 2018 is derived from our 2018 Annual Report on Form 10-K. The condensed consolidated financial statements included herein should be read in conjunction with the consolidated financial statements and the notes thereto included in our 2018 Annual Report on Form 10-K. The results of operations for the interim periods presented are not necessarily indicative of the results to be expected for the full year. Fiscal Year We operate on a 52/53 week fiscal year, whereby the fiscal year ends on the last Saturday of December. Fiscal 2019 and 2018 each contain 52 weeks and the three months ended March 30, 2019 and March 31, 2018 each contained 13 weeks. Fiscal 2019 will end on December 28, 2019. Reclassifications Certain immaterial reclassifications were made to the prior period financial statements to conform to the current period presentation. Critical Accounting Policies Our critical accounting policies have not changed during the three months ended March 30, 2019 from those disclosed in our Annual Report on Form 10-K for the year ended December 29, 2018. New Accounting Pronouncements ASU 2018-15 In August 2018, the Financial Accounting Standard Board ("FASB") issued Accounting Standards Update ("ASU") 2018-15, "Intangibles-Goodwill and Other-Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract." The new guidance clarifies the accounting for implementation costs in cloud computing arrangements. ASU 2018-15 is effective for fiscal years, including interim periods within those fiscal years, beginning after December 15, 2019. Early adoption is permitted. ASU 2018-15 should be applied either retrospectively or prospectively to all implementation costs incurred after the date of adoption. We have not yet determined the impact of this standard on our financial statements. ASU 2016-02, ASU 2018-10, ASU 2018-11 and ASU 2019-01 In February 2016, the FASB issued ASU 2016-02, "Leases (Topic 842)," which requires the recognition of right-of-use assets and lease liabilities for all long-term leases, including operating leases, on the balance sheet. ASU 2016-02 was amended in July 2018 by both ASU 2018-10, "Codification Improvements to Topic 842, Leases," and ASU 2018-11, "Leases (Topic 842): Targeted Improvements" and in March 2019 by ASU 2019-01, "Leases (Topic 842): Codification Improvements." ASU 2016-02 provides additional guidance on the measurement of the right-of-use assets and lease liabilities and requires enhanced disclosures about our leasing arrangements. We adopted Topic 842 and all related amendments on December 30, 2018, the first day of fiscal 2019, using the modified transition approach. The modified transition approach permits a company to use its effective date as the date of initial application to apply the standard to its leases, and, therefore, not restate comparative prior period financial information. Consequently, prior period financial information is not updated, and the disclosures required under the new standard will not be provided for dates and periods before December 30, 2018. The standard provides several optional practical expedients in transition. We elected the ‘package of practical expedients,’ which permits us to not reassess, under the new standard, our prior conclusions about lease identification, lease classification and initial direct costs. We did not elect the use-of-hindsight or the practical expedient pertaining to land easements; the latter not being applicable to us. The new standard also provides practical expedients for an entity’s ongoing accounting. We elected the short-term lease recognition exemption. This means, for those leases that qualify, we will not recognize a right-of-use asset or lease liability, and this includes not recognizing right-of-use assets or lease liabilities for existing short-term leases of those assets in transition. We also elected the practical expedient to not separate lease and non-lease components for all our leases. The adoption of the lease standard did not have any effect on our previously reported Condensed Consolidated Statements of Operations and did not result in a cumulative catch-up adjustment to opening equity. See Note 12 for additional information.

Concentration of Credit and Other Risks

3 Months Ended

Mar. 30, 2019

Risks and Uncertainties [Abstract]

Concentration of Credit and Other Risks

Each of the following customers accounted for 10% or more of our revenues for the periods indicated:



	Three Months Ended
	March 30, 2019		March 31, 2018
Intel Corporation	21.3	%	14.0	%
SK Hynix Inc.	*		10.1
Samsung Electronics., LTD.	13.8		*
	35.1	%	24.1	%

*Represents less than 10% of total revenues.

At March 30, 2019, two customers accounted for 16.7% and 10.7% of gross accounts receivable, respectively. At December 29, 2018, two customers accounted for 27.8% and 13.0% of gross accounts receivable, respectively.

Inventories

3 Months Ended

Mar. 30, 2019

Inventory Disclosure [Abstract]

Inventories

Inventories, net

Inventories are stated at the lower of cost (principally standard cost, which approximates actual cost on a first in, first out basis) or net realizable value.

Inventories, net, consisted of the following (in thousands):



	March 30, 2019		December 29, 2018
Raw materials	$	44,627	$	43,380
Work-in-progress	22,356		20,431
Finished goods	16,233		13,895
	$	83,216	$	77,706

Goodwill and Intangible Assets

3 Months Ended

Mar. 30, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets

Goodwill by reportable segment was as follows (in thousands):



	Probe Cards		Systems			Total
Goodwill, gross, as of December 30, 2017	$	172,482	$	17,438		$	189,920
Foreign currency translation	—		(706		)	(706		)
Goodwill, gross, as of December 29, 2018	172,482		16,732			189,214
Foreign currency translation	—		(289		)	(289		)
Goodwill, gross, as of March 30, 2019	$	172,482	$	16,443		$	188,925

We have not recorded any goodwill impairments as of March 30, 2019.

Intangible assets were as follows (in thousands):



	March 30, 2019						December 29, 2018
Other Intangible Assets	Gross		Accumulated Amortization		Net		Gross		Accumulated Amortization		Net
Existing developed technologies	$	143,179	$	101,708	$	41,471	$	143,408	$	97,111	$	46,297
Trade name	11,997		10,206		1,791		12,023		9,173		2,850
Customer relationships	40,077		22,954		17,123		40,146		21,653		18,493
	$	195,253	$	134,868	$	60,385	$	195,577	$	127,937	$	67,640

Amortization expense was included in our Condensed Consolidated Statements of Income as follows (in thousands):



	Three Months Ended
	March 30, 2019		March 31, 2018
Cost of revenues	$	4,719	$	5,157
Selling, general and administrative	2,371		2,037
	$	7,090	$	7,194

The estimated future amortization of intangible assets is as follows (in thousands):



Fiscal Year	Amount
Remainder of 2019	$	19,249
2020	23,318
2021	12,592
2022	3,484
2023	1,742
	$	60,385

Accrued Liabilities

3 Months Ended

Mar. 30, 2019

Payables and Accruals [Abstract]

Accrued Liabilities

Accrued liabilities consisted of the following (in thousands):



	March 30, 2019		December 29, 2018
Accrued compensation and benefits	$	13,135	$	15,600
Accrued employee stock purchase plan contributions withheld	1,475		3,174
Accrued warranty	2,021		2,102
Accrued income and other taxes	2,906		4,222
Other accrued expenses	3,022		2,633
	$	22,559	$	27,731

Fair Value and Derivative Instruments

3 Months Ended

Mar. 30, 2019

Fair Value Disclosures [Abstract]

Fair Value and Derivative Instruments

Whenever possible, the fair values of our financial assets and liabilities are determined using quoted market prices of identical securities or quoted market prices of similar securities from active markets. The three levels of inputs that may be used to measure fair value are as follows:


•	Level 1 valuations are obtained from real-time quotes for transactions in active exchange markets involving identical securities;


•	Level 2 valuations utilize significant observable inputs, such as quoted prices for similar assets or liabilities, quoted prices near the reporting date in markets that are less active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities; and


•	Level 3 valuations utilize unobservable inputs to the valuation methodology and include our own data about assumptions market participants would use in pricing the asset or liability based on the best information available under the circumstances.

We did not have any transfers of assets or liabilities measured at fair value on a recurring basis to or from Level 1, Level 2 or Level 3 during the three months ended March 30, 2019 or the year ended December 29, 2018.

The carrying values of Cash, Accounts receivable, net, Restricted cash, Prepaid expenses and other current assets, Accounts payable and Accrued liabilities approximate fair value due to their short maturities.

No changes were made to our valuation techniques during the first three months of fiscal 2019.

Assets and Liabilities Measured at Fair Value on a Recurring Basis

Assets and liabilities measured at fair value on a recurring basis were as follows (in thousands):



March 30, 2019	Level 1		Level 2			Total
Assets:
Cash equivalents:
Money market funds	$	3,077	$	—		$	3,077
Marketable securities:
U.S. Treasuries	15,450		—			15,450
Certificates of deposit	—		959			959
Agency securities	—		11,631			11,631
Corporate bonds	—		26,046			26,046
Commercial paper	—		—			—
	15,450		38,636			54,086
Interest rate swap derivative contracts	—		427			427
Total assets	$	18,527	$	39,063		$	57,590
Liabilities:
Foreign exchange derivative contracts	$	—	$	(377	)	$	(377	)



December 29, 2018	Level 1		Level 2		Total
Assets:
Cash equivalents:
Money market funds	$	1,184	$	—	$	1,184
Marketable securities:
U.S. Treasuries	7,997		—		7,997
Certificates of deposit	—		957		957
Agency securities	—		8,608		8,608
Corporate bonds	—		30,674		30,674
Commercial paper	—		2,295		2,295
	7,997		42,534		50,531
Interest rate swap derivative contracts	—		871		871
Total assets	$	9,181	$	43,405	$	52,586

We did not have any liabilities measured at fair value on a recurring basis at December 29, 2018.

Cash Equivalents

The fair value of our cash equivalents is determined based on quoted market prices for similar or identical securities.

Marketable Securities

We classify our marketable securities as available-for-sale and value them utilizing a market approach. Our investments are priced by pricing vendors who provide 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 value. Our broker-priced investments are categorized as Level 2 investments because fair value is 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 value is appropriate.

Unrealized gains and losses were immaterial and were recorded as a component of Accumulated other comprehensive income in our Condensed Consolidated Balance Sheets. We did not have any other-than-temporary unrealized gains or losses at either period end included in these financial statements.

Interest Rate Swaps

The fair value of our interest rate swap contracts is determined at the end of each reporting period based on valuation models that use interest rate yield curves as inputs. For accounting purposes, our interest rate swap contracts qualify for, and are designated as, cash flow hedges. The cash flows associated with the interest rate swaps are reported in Net cash provided by operating activities in our Condensed Consolidated Statements of Cash Flows and the fair value of the interest rate swap contracts are recorded within Prepaid expenses and other current assets and Other assets in our Condensed Consolidated Balance Sheets.

The impact of the interest rate swaps on our Condensed Consolidated Statements of Income was as follows (in thousands):



	Amount of Gain or (Loss) Recognized in Accumulated OCI on Derivative			Location of Gain or (Loss) Reclassified from Accumulated OCI into Income	Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income			Location of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion)	Amount of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion )
Three Months Ended March 30, 2019	$	(28	)	Interest expense	$	(208	)	Interest expense	$	—
Three Months Ended March 31, 2018	$	255		Interest expense	$	132		Interest expense	$	—

Foreign Exchange Derivative Contracts

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 and forecasted foreign currency revenue and expense transactions. Under this program, our strategy is to have increases or decreases in our foreign currency exposures mitigated by gains or losses on the foreign currency forward contracts in order 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. For accounting purposes, certain of our foreign currency forward contracts are not designated as hedging instruments and, accordingly, we record the fair value of these contracts as of the end of our reporting period in our Condensed Consolidated Balance Sheets with changes in fair value recorded within Other income (expense), net in our Condensed Consolidated Statement of Income for both realized and unrealized gains and losses. Certain of our foreign currency forward contracts are designated as cash flow hedges, and, accordingly, we record the fair value of these contracts as of the end of our reporting period in our Condensed Consolidated Balance Sheets with changes in fair value recorded as a component of accumulated other comprehensive income and reclassified into earnings in the same period in which the hedged transaction affects earnings, and in the same line item on the Condensed Consolidated Statements of Income as the impact of the hedge transaction. At March 30, 2019, we expect to reclassify $0.4 million of the amount accumulated in other comprehensive income (loss) to earnings during the next 12 months, due to the recognition in earnings of the hedged forecasted transactions.

The fair value of our foreign exchange derivative contracts was determined based on current foreign currency exchange rates and forward points. All of our foreign exchange derivative contracts outstanding at March 30, 2019 will mature in the fourth quarter of fiscal 2019.

The following table provides information about our foreign currency forward contracts outstanding as of March 30, 2019 (in thousands):



Currency	Contract Position	Contract Amount (Local Currency)		Contract Amount (U.S. Dollars)
Euro Dollar	Buy	(2,511	)	$	(3,320	)
Japanese Yen	Buy	(324,310	)	(2,932		)
Korean Won	Buy	(2,982,606	)	(2,651		)
Total USD notional amount of outstanding foreign exchange contracts				$	(8,903	)

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.

The impact of foreign exchange derivative contracts not designated as cash flow hedges on our Condensed Consolidated Statements of Income was as follows (in thousands):



		Amount of Gain Recognized on Derivatives
			Three Months Ended
Derivatives Not Designated as Hedging Instruments	Location of Gain Recognized on Derivatives		March 30, 2019		March 31, 2018
Foreign exchange forward contracts	Other expense, net		$	314	$	862

The impact of foreign exchange derivative contracts designated as cash flow hedges on our Condensed Consolidated Statements of Income was as follows (in thousands):



	Amount of Loss Recognized in Accumulated OCI on Derivative			Location of Loss Reclassified from Accumulated OCI into Income	Amount of Loss Reclassified from Accumulated OCI into Income
Three Months Ended March 30, 2019	$	(435	)	Cost of revenues	$	(32	)
				Research and development	(19		)
				Selling, general and administrative	(7		)
					$	(58	)

Three Months Ended March 31, 2018	$	—			$	—

Assets and Liabilities 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 in the period when we make a business acquisition. There were no assets or liabilities measured at fair value on a nonrecurring basis during the three months ended March 30, 2019 or March 31, 2018.

- 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

Restructuring Charges

3 Months Ended

Mar. 30, 2019

Restructuring and Related Activities [Abstract]

Restructuring Charges

Restructuring charges in the first quarter of fiscal 2019 compromised of costs related to employee termination benefits, cost of long-lived asset abandonment, as well as inventory write downs.

Restructuring charges were included in our Consolidated Statement of Operations as follows (in thousands):



	Three Months Ended
	March 30, 2019		March 31, 2018
Cost of revenues	$	120	$	—
Selling, general, and administrative	89		—
	$	209	$	—

Changes to the restructuring accrual in the three months ended March 30, 2019 were as follows (in thousands):



	Employee Severance and Benefits		Other Costs			Total Accrual
December 29, 2018	$	20	$	—		$	20
Restructuring charges	75		134			209
Non-cash settlement	—		(134		)	(134		)
March 30, 2019	$	95	$	—		$	95

Warranty

3 Months Ended

Mar. 30, 2019

Product Warranties Disclosures [Abstract]

Warranty

We offer warranties on certain products and record a liability for the estimated future costs associated with warranty claims at the time revenue is recognized. The warranty liability is based upon historical experience and our estimate of the level of future costs. While we engage in product quality programs and processes, our warranty obligation is affected by product failure rates, material usage and service delivery costs. We continuously monitor product returns for warranty and maintain a reserve for the related expenses based upon our historical experience and any specifically identified failures. As we sell new products to our customers, we must exercise considerable judgment in estimating the expected failure rates. This estimating process is based on historical experience of similar products, as well as various other assumptions that we believe to be reasonable under the circumstances.

We provide for the estimated cost of product warranties at the time revenue is recognized as a component of Cost of revenues in our Condensed Consolidated Statement of Income.

Changes in our warranty liability were as follows (in thousands):



	Three Months Ended
	March 30, 2019			March 31, 2018
Balance at beginning of period	$	2,102		$	3,662
Accruals	889			1,025
Settlements	(970		)	(1,848		)
Balance at end of period	$	2,021		$	2,839

Stockholders' Equity

3 Months Ended

Mar. 30, 2019

Equity [Abstract]

Stockholders' Equity

Stockholders’ Equity and Stock-Based Compensation

Common Stock Repurchase Program

In February 2017, our Board of Directors authorized a program to repurchase up to $25 million of outstanding common stock to offset potential dilution from issuances of common stock under our employee stock purchase plan and equity incentive plan. The share repurchase program will expire on February 1, 2020. Repurchased shares are retired upon the settlement of the related transactions with the excess of cost over par value charged to additional paid-in capital. All repurchases are made in compliance with Rule 10b-18 under the Securities Exchange Act of 1934, as amended.

During the three months ended March 30, 2019, we did not repurchase any shares. As of March 30, 2019, $6.0 million remained available for future repurchases.

Restricted Stock Units

Restricted stock unit ("RSU") activity under our equity incentive plan was as follows:



	Units		Weighted Average Grant Date Fair Value
RSUs at December 29, 2018	3,102,226		$	12.79
Awards vested	(47,696	)	10.17
Awards forfeited	(17,501	)	12.77
RSUs at March 30, 2019	3,037,029		12.83

The total fair value of RSUs vested during the three months ended March 30, 2019 was $0.7 million.

Performance Restricted Stock Units

We may grant Performance RSUs ("PRSUs") to certain executives, which vest based upon us achieving certain market performance criteria. There were no PRSUs granted during the first quarter of fiscal 2019. PRSUs are included as part of the RSU activity above.

Stock Options

Stock option activity under our equity incentive plan was as follows:



	Options Outstanding		Weighted Average Exercise Price		Weighted Average Remaining Contractual Life in Years	Aggregate Intrinsic Value
Outstanding at December 29, 2018	524,725		$	8.00
Options exercised	(19,207	)	4.69
Outstanding at March 30, 2019	505,518		$	8.12	2.88	$	4,028,192
Vested and expected to vest at March 30, 2019	505,518		$	8.12	2.88	$	4,028,192
Exercisable at March 30, 2019	505,518		$	8.12	2.88	$	4,028,192

Employee Stock Purchase Plan

Information related to activity under our Employee Stock Purchase Plan ("ESPP") was as follows:



	Three Months Ended
	March 30, 2019
Shares issued	301,497
Weighted average per share purchase price	$	12.18
Weighted average per share discount from the fair value of our common stock on the date of issuance	$	4.85

Stock-Based Compensation

Stock-based compensation was included in our Condensed Consolidated Statements of Income as follows (in thousands):



	Three Months Ended
	March 30, 2019		March 31, 2018
Cost of revenues	$	950	$	920
Research and development	1,519		1,302
Selling, general and administrative	2,826		1,534
Total stock-based compensation	$	5,295	$	3,756

Unrecognized Compensation Costs

At March 30, 2019, the unrecognized stock-based compensation was as follows (dollars in thousands):



	Unrecognized Expense		Average Expected Recognition Period in Years
Restricted stock units	$	20,178	1.87
Performance restricted stock units	4,991		1.99
Employee stock purchase plan	975		0.84
Total unrecognized stock-based compensation expense	$	26,144

Net Income (Loss) per Share

3 Months Ended

Mar. 30, 2019

Earnings Per Share [Abstract]

Net Income (Loss) per Share

Net Income per Share

The following table reconciles the shares used in calculating basic net income per share and diluted net income per share (in thousands):



	Three Months Ended
	March 30, 2019	March 31, 2018
Weighted-average shares used in computing basic net income per share	74,362	72,826
Add potentially dilutive securities	1,647	1,516
Weighted-average shares used in computing diluted net income per share	76,009	74,342

Securities not included as they would have been antidilutive	38	19

Commitments and Contingencies	3 Months Ended
Commitments and Contingencies	Mar. 30, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Leases See Note 12. Contractual Commitments and Purchase Obligations Our purchase obligations and other contractual obligations have not materially changed as of March 30, 2019 from those disclosed in our Annual Report on Form 10-K for the year ended December 29, 2018. Legal Matters From time to time, we may be subject to legal proceedings and claims in the ordinary course of business. As of March 30, 2019, and as of the filing of this Quarterly Report on Form 10-Q, we were not involved in any material legal proceedings.

Operating Segments

3 Months Ended

Mar. 30, 2019

Segment Reporting [Abstract]

Operating Segments

Operating Segments and Enterprise-Wide Information

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. We operate in two reportable segments consisting of the Probe Cards segment and the Systems segment. The following table summarizes the operating results by reportable segment (dollars in thousands):



	Three Months Ended
	March 30, 2019												March 31, 2018
	Probe Cards			Systems			Corporate and Other			Total			Probe Cards			Systems			Corporate and Other			Total
Revenues	$	108,103		$	24,110		$	—		$	132,213		$	94,928		$	23,362		$	—		$	118,290
Gross profit	$	45,294		$	13,016		$	(5,789	)	$	52,521		$	40,071		$	11,135		$	(6,077	)	$	45,129
Gross margin	41.9		%	54.0		%	—		%	39.7		%	42.2		%	47.7		%	—		%	38.2		%

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

Corporate and Other includes unallocated expenses relating to amortization of intangible assets, share-based compensation, and restructuring charges, net, which are not used in evaluating the results of, or in allocating resources to, our reportable segments.

Certain revenue category information by reportable segment was as follows (in thousands):



	Three Months Ended
	March 30, 2019						March 31, 2018
	Probe Cards		Systems		Total		Probe Cards		Systems		Total
Market:
Foundry & Logic	$	71,580	$	—	$	71,580	$	58,439	$	—	$	58,439
DRAM	28,886		—		28,886		30,266		—		30,266
Flash	7,637		—		7,637		6,223		—		6,223
Systems	—		24,110		24,110		—		23,362		23,362
Total	$	108,103	$	24,110	$	132,213	$	94,928	$	23,362	$	118,290
Timing of revenue recognition:
Products transferred at a point in time	$	107,491	$	23,142	$	130,633	$	94,434	$	22,521	$	116,955
Services transferred over time	612		968		1,580		494		841		1,335
Total	$	108,103	$	24,110	$	132,213	$	94,928	$	23,362	$	118,290
Geographical region:
United States	$	27,655	$	6,608	$	34,263	$	26,488	$	6,375	$	32,863
South Korea	25,018		1,705		26,723		13,916		1,074		14,990
Taiwan	21,257		1,130		22,387		25,971		1,751		27,722
China	18,151		3,692		21,843		9,027		3,247		12,274
Japan	5,300		5,132		10,432		10,132		3,540		13,672
Europe	5,373		4,120		9,493		5,573		5,929		11,502
Asia-Pacific¹	2,790		473		3,263		3,490		1,325		4,815
Rest of the world	2,559		1,250		3,809		331		121		452
Total	$	108,103	$	24,110	$	132,213	$	94,928	$	23,362	$	118,290

¹ Asia-Pacific includes all countries in the region except China, Japan, South Korea, and Taiwan, which are disclosed separately.

Leases

3 Months Ended

Mar. 30, 2019

Leases [Abstract]

Leases

We lease real estate space under non-cancelable operating lease agreements for commercial and industrial space, as well as our corporate headquarters located in Livermore, California. Our leases have remaining terms of 1 to 10 years, and some leases include options to extend up to 20 years. We also have operating leases for automobiles with remaining lease terms of 1 to 4 years. We did not include any of our renewal options in our lease terms for calculating our lease liability as the renewal options allow us to maintain operational flexibility and we are not reasonably certain we will exercise these options at this time. The weighted-average remaining lease term for our operating leases was 8 years at March 30, 2019 and the weighted-average discount rate was 4.7%.

The components of lease expense were as follows (in thousands):



	Three Months Ended
	March 30, 2019
Lease expense:
Operating lease expense	$	1,745
Short-term lease expense	17
Variable lease expense	419
	$	2,181

Future minimum payments under our non-cancelable operating leases were as follows as of March 30, 2019 (in thousands):



Fiscal Year	Amount
Remainder of 2019	$	4,950
2020	6,698
2021	5,819
2022	4,890
2023	4,432
Thereafter	20,406
	$	47,195

Revenue	3 Months Ended
Revenue	Mar. 30, 2019
Revenue from Contract with Customer [Abstract]
Revenue	Revenue Transaction price allocated to the remaining performance obligations: On March 30, 2019, we had $3.9 million of remaining performance obligations, which were comprised of deferred service contracts and extended warranty contracts not yet delivered. We expect to recognize approximately 74% of our remaining performance obligations as revenue in the remainder of fiscal 2019, and approximately 26% in fiscal 2020 and thereafter. The foregoing excludes the value of other remaining performance obligations as they have original durations of one year or less, and also excludes information about variable consideration allocated entirely to a wholly unsatisfied performance obligation. Contract balances: The timing of revenue recognition may differ from the timing of invoicing to customers. Accounts receivable is recorded at the invoiced amount, net of an allowance for doubtful accounts. A receivable is recognized in the period we deliver goods or provide services or when our right to consideration is unconditional. A contract asset is recorded when we have performed under the contract but our right to consideration is conditional on something other than the passage of time. Contract assets as of March 30, 2019 and December 29, 2018 were $0.6 million and $0.3 million, respectively, and are reported on the Condensed Consolidated Balance Sheets as a component of Prepaid expenses and other current assets. Contract liabilities include payments received in advance of performance under a contract and are satisfied as the associated revenue is recognized. Contract liabilities are reported on the Condensed Consolidated Balance Sheets on a contract-by-contract basis at the end of each reporting period as a component of Deferred revenue and Other liabilities. Contract liabilities as of March 30, 2019 and December 29, 2018 were $7.6 million and $5.7 million, respectively. During the three months ended March 30, 2019, we recognized $1.4 million of revenue that was included in contract liabilities as of December 29, 2018. Costs to obtain a contract: We generally expense sales commissions when incurred as a component of Selling, general and administrative expense as the amortization period is typically less than one year. Revenue by Category: Refer to Note 14 of Notes to Consolidated Financial Statements for further details.

Basis of Presentation and New Accounting Pronouncements (Policies)

3 Months Ended

Mar. 30, 2019

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Presentation

The accompanying condensed consolidated financial information of FormFactor, Inc. is unaudited and has been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) and pursuant to the rules and regulations of the Securities and Exchange Commission. However, such information reflects all adjustments, consisting only of normal recurring adjustments, which are, in the opinion of management, necessary for a fair presentation of the financial position, results of operations and cash flows for the interim periods. The financial information as of December 29, 2018 is derived from our 2018 Annual Report on Form 10-K. The condensed consolidated financial statements included herein should be read in conjunction with the consolidated financial statements and the notes thereto included in our 2018 Annual Report on Form 10-K. The results of operations for the interim periods presented are not necessarily indicative of the results to be expected for the full year.

Fiscal Year

We operate on a 52/53 week fiscal year, whereby the fiscal year ends on the last Saturday of December. Fiscal 2019 and 2018 each contain 52 weeks and the three months ended March 30, 2019 and March 31, 2018 each contained 13 weeks. Fiscal 2019 will end on December 28, 2019.

Reclassifications

Certain immaterial reclassifications were made to the prior period financial statements to conform to the current period presentation.

New Accounting Pronouncements

ASU 2018-15

In August 2018, the Financial Accounting Standard Board ("FASB") issued Accounting Standards Update ("ASU") 2018-15, "Intangibles-Goodwill and Other-Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract." The new guidance clarifies the accounting for implementation costs in cloud computing arrangements. ASU 2018-15 is effective for fiscal years, including interim periods within those fiscal years, beginning after December 15, 2019. Early adoption is permitted. ASU 2018-15 should be applied either retrospectively or prospectively to all implementation costs incurred after the date of adoption. We have not yet determined the impact of this standard on our financial statements.

ASU 2016-02, ASU 2018-10, ASU 2018-11 and ASU 2019-01

In February 2016, the FASB issued ASU 2016-02, "Leases (Topic 842)," which requires the recognition of right-of-use assets and lease liabilities for all long-term leases, including operating leases, on the balance sheet. ASU 2016-02 was amended in July 2018 by both ASU 2018-10, "Codification Improvements to Topic 842, Leases," and ASU 2018-11, "Leases (Topic 842): Targeted Improvements" and in March 2019 by ASU 2019-01, "Leases (Topic 842): Codification Improvements." ASU 2016-02 provides additional guidance on the measurement of the right-of-use assets and lease liabilities and requires enhanced disclosures about our leasing arrangements. We adopted Topic 842 and all related amendments on December 30, 2018, the first day of fiscal 2019, using the modified transition approach. The modified transition approach permits a company to use its effective date as the date of initial application to apply the standard to its leases, and, therefore, not restate comparative prior period financial information. Consequently, prior period financial information is not updated, and the disclosures required under the new standard will not be provided for dates and periods before December 30, 2018. The standard provides several optional practical expedients in transition. We elected the ‘package of practical expedients,’ which permits us to not reassess, under the new standard, our prior conclusions about lease identification, lease classification and initial direct costs. We did not elect the use-of-hindsight or the practical expedient pertaining to land easements; the latter not being applicable to us. The new standard also provides practical expedients for an entity’s ongoing accounting. We elected the short-term lease recognition exemption. This means, for those leases that qualify, we will not recognize a right-of-use asset or lease liability, and this includes not recognizing right-of-use assets or lease liabilities for existing short-term leases of those assets in transition. We also elected the practical expedient to not separate lease and non-lease components for all our leases. The adoption of the lease standard did not have any effect on our previously reported Condensed Consolidated Statements of Operations and did not result in a cumulative catch-up adjustment to opening equity.

Fair Value Policy

Assets and Liabilities 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 in the period when we make a business acquisition.


•	Level 1 valuations are obtained from real-time quotes for transactions in active exchange markets involving identical securities;


•	Level 2 valuations utilize significant observable inputs, such as quoted prices for similar assets or liabilities, quoted prices near the reporting date in markets that are less active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities; and


•	Level 3 valuations utilize unobservable inputs to the valuation methodology and include our own data about assumptions market participants would use in pricing the asset or liability based on the best information available under the circumstances.

No changes were made to our valuation techniques during the first three months of fiscal 2019.

Concentration of Credit and Other Risks (Tables)

3 Months Ended

Mar. 30, 2019

Risks and Uncertainties [Abstract]

Schedule of Customer Percentage of Revenue

Each of the following customers accounted for 10% or more of our revenues for the periods indicated:



	Three Months Ended
	March 30, 2019		March 31, 2018
Intel Corporation	21.3	%	14.0	%
SK Hynix Inc.	*		10.1
Samsung Electronics., LTD.	13.8		*
	35.1	%	24.1	%

Inventories (Tables)

3 Months Ended

Mar. 30, 2019

Inventory Disclosure [Abstract]

Schedule of Inventory Components

Inventories, net, consisted of the following (in thousands):



	March 30, 2019		December 29, 2018
Raw materials	$	44,627	$	43,380
Work-in-progress	22,356		20,431
Finished goods	16,233		13,895
	$	83,216	$	77,706

Goodwill and Intangible Assets (Tables)

3 Months Ended

Mar. 30, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill by Reportable Segments

Goodwill by reportable segment was as follows (in thousands):



	Probe Cards		Systems			Total
Goodwill, gross, as of December 30, 2017	$	172,482	$	17,438		$	189,920
Foreign currency translation	—		(706		)	(706		)
Goodwill, gross, as of December 29, 2018	172,482		16,732			189,214
Foreign currency translation	—		(289		)	(289		)
Goodwill, gross, as of March 30, 2019	$	172,482	$	16,443		$	188,925

Schedule of Intangible Assets

Intangible assets were as follows (in thousands):



	March 30, 2019						December 29, 2018
Other Intangible Assets	Gross		Accumulated Amortization		Net		Gross		Accumulated Amortization		Net
Existing developed technologies	$	143,179	$	101,708	$	41,471	$	143,408	$	97,111	$	46,297
Trade name	11,997		10,206		1,791		12,023		9,173		2,850
Customer relationships	40,077		22,954		17,123		40,146		21,653		18,493
	$	195,253	$	134,868	$	60,385	$	195,577	$	127,937	$	67,640

Schedule of Amortization Expense

Amortization expense was included in our Condensed Consolidated Statements of Income as follows (in thousands):



	Three Months Ended
	March 30, 2019		March 31, 2018
Cost of revenues	$	4,719	$	5,157
Selling, general and administrative	2,371		2,037
	$	7,090	$	7,194

Schedule of Estimated Amortization of Intangible Assets

The estimated future amortization of intangible assets is as follows (in thousands):



Fiscal Year	Amount
Remainder of 2019	$	19,249
2020	23,318
2021	12,592
2022	3,484
2023	1,742
	$	60,385

Accrued Liabilities (Tables)

3 Months Ended

Mar. 30, 2019

Payables and Accruals [Abstract]

Schedule of Accrued Liabilities [Table Text Block]

Accrued liabilities consisted of the following (in thousands):



	March 30, 2019		December 29, 2018
Accrued compensation and benefits	$	13,135	$	15,600
Accrued employee stock purchase plan contributions withheld	1,475		3,174
Accrued warranty	2,021		2,102
Accrued income and other taxes	2,906		4,222
Other accrued expenses	3,022		2,633
	$	22,559	$	27,731

Fair Value and Derivative Instruments (Tables)

3 Months Ended

Mar. 30, 2019

Fair Value Disclosures [Abstract]

Fair Value Assets Measured on Recurring Basis

Assets and liabilities measured at fair value on a recurring basis were as follows (in thousands):



March 30, 2019	Level 1		Level 2			Total
Assets:
Cash equivalents:
Money market funds	$	3,077	$	—		$	3,077
Marketable securities:
U.S. Treasuries	15,450		—			15,450
Certificates of deposit	—		959			959
Agency securities	—		11,631			11,631
Corporate bonds	—		26,046			26,046
Commercial paper	—		—			—
	15,450		38,636			54,086
Interest rate swap derivative contracts	—		427			427
Total assets	$	18,527	$	39,063		$	57,590
Liabilities:
Foreign exchange derivative contracts	$	—	$	(377	)	$	(377	)



December 29, 2018	Level 1		Level 2		Total
Assets:
Cash equivalents:
Money market funds	$	1,184	$	—	$	1,184
Marketable securities:
U.S. Treasuries	7,997		—		7,997
Certificates of deposit	—		957		957
Agency securities	—		8,608		8,608
Corporate bonds	—		30,674		30,674
Commercial paper	—		2,295		2,295
	7,997		42,534		50,531
Interest rate swap derivative contracts	—		871		871
Total assets	$	9,181	$	43,405	$	52,586

Schedule of the Impact of Cash Flow Hedges on Consolidated Financial Statements

The impact of the interest rate swaps on our Condensed Consolidated Statements of Income was as follows (in thousands):



	Amount of Gain or (Loss) Recognized in Accumulated OCI on Derivative			Location of Gain or (Loss) Reclassified from Accumulated OCI into Income	Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income			Location of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion)	Amount of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion )
Three Months Ended March 30, 2019	$	(28	)	Interest expense	$	(208	)	Interest expense	$	—
Three Months Ended March 31, 2018	$	255		Interest expense	$	132		Interest expense	$	—

Schedule of Foreign Currency Forward Contracts

The following table provides information about our foreign currency forward contracts outstanding as of March 30, 2019 (in thousands):



Currency	Contract Position	Contract Amount (Local Currency)		Contract Amount (U.S. Dollars)
Euro Dollar	Buy	(2,511	)	$	(3,320	)
Japanese Yen	Buy	(324,310	)	(2,932		)
Korean Won	Buy	(2,982,606	)	(2,651		)
Total USD notional amount of outstanding foreign exchange contracts				$	(8,903	)

The impact of foreign exchange derivative contracts designated as cash flow hedges on our Condensed Consolidated Statements of Income was as follows (in thousands):



	Amount of Loss Recognized in Accumulated OCI on Derivative			Location of Loss Reclassified from Accumulated OCI into Income	Amount of Loss Reclassified from Accumulated OCI into Income
Three Months Ended March 30, 2019	$	(435	)	Cost of revenues	$	(32	)
				Research and development	(19		)
				Selling, general and administrative	(7		)
					$	(58	)

Three Months Ended March 31, 2018	$	—			$	—

Schedule of Gains and Losses Related to Non-designated Derivative Instruments



		Amount of Gain Recognized on Derivatives
			Three Months Ended
Derivatives Not Designated as Hedging Instruments	Location of Gain Recognized on Derivatives		March 30, 2019		March 31, 2018
Foreign exchange forward contracts	Other expense, net		$	314	$	862

Restructuring Charges (Tables)

3 Months Ended

Mar. 30, 2019

Restructuring and Related Activities [Abstract]

Restructuring Charges

Restructuring charges were included in our Consolidated Statement of Operations as follows (in thousands):



	Three Months Ended
	March 30, 2019		March 31, 2018
Cost of revenues	$	120	$	—
Selling, general, and administrative	89		—
	$	209	$	—

Schedule of Restructuring Accrual Activity

Changes to the restructuring accrual in the three months ended March 30, 2019 were as follows (in thousands):



	Employee Severance and Benefits		Other Costs			Total Accrual
December 29, 2018	$	20	$	—		$	20
Restructuring charges	75		134			209
Non-cash settlement	—		(134		)	(134		)
March 30, 2019	$	95	$	—		$	95

Warranty (Tables)

3 Months Ended

Mar. 30, 2019

Product Warranties Disclosures [Abstract]

Reconciliation of Changes in Warranty Liability

Changes in our warranty liability were as follows (in thousands):



	Three Months Ended
	March 30, 2019			March 31, 2018
Balance at beginning of period	$	2,102		$	3,662
Accruals	889			1,025
Settlements	(970		)	(1,848		)
Balance at end of period	$	2,021		$	2,839

Stockholders' Equity (Tables)

3 Months Ended

Mar. 30, 2019

Equity [Abstract]

Schedule of Restricted Stock Unit Activity

Restricted stock unit ("RSU") activity under our equity incentive plan was as follows:



	Units		Weighted Average Grant Date Fair Value
RSUs at December 29, 2018	3,102,226		$	12.79
Awards vested	(47,696	)	10.17
Awards forfeited	(17,501	)	12.77
RSUs at March 30, 2019	3,037,029		12.83

Schedule of Stock Option Activity

Stock option activity under our equity incentive plan was as follows:



	Options Outstanding		Weighted Average Exercise Price		Weighted Average Remaining Contractual Life in Years	Aggregate Intrinsic Value
Outstanding at December 29, 2018	524,725		$	8.00
Options exercised	(19,207	)	4.69
Outstanding at March 30, 2019	505,518		$	8.12	2.88	$	4,028,192
Vested and expected to vest at March 30, 2019	505,518		$	8.12	2.88	$	4,028,192
Exercisable at March 30, 2019	505,518		$	8.12	2.88	$	4,028,192

Schedule of ESPP Activity

Information related to activity under our Employee Stock Purchase Plan ("ESPP") was as follows:



	Three Months Ended
	March 30, 2019
Shares issued	301,497
Weighted average per share purchase price	$	12.18
Weighted average per share discount from the fair value of our common stock on the date of issuance	$	4.85

Schedule of Stock-based Compensation

Stock-based compensation was included in our Condensed Consolidated Statements of Income as follows (in thousands):



	Three Months Ended
	March 30, 2019		March 31, 2018
Cost of revenues	$	950	$	920
Research and development	1,519		1,302
Selling, general and administrative	2,826		1,534
Total stock-based compensation	$	5,295	$	3,756

Schedule of Unrecognized Stock-based Compensation

At March 30, 2019, the unrecognized stock-based compensation was as follows (dollars in thousands):



	Unrecognized Expense		Average Expected Recognition Period in Years
Restricted stock units	$	20,178	1.87
Performance restricted stock units	4,991		1.99
Employee stock purchase plan	975		0.84
Total unrecognized stock-based compensation expense	$	26,144

Net Income (Loss) per Share (Tables)

3 Months Ended

Mar. 30, 2019

Earnings Per Share [Abstract]

Schedule of Calculation of Numerator and Denominator in Earnings Per Share

The following table reconciles the shares used in calculating basic net income per share and diluted net income per share (in thousands):



	Three Months Ended
	March 30, 2019	March 31, 2018
Weighted-average shares used in computing basic net income per share	74,362	72,826
Add potentially dilutive securities	1,647	1,516
Weighted-average shares used in computing diluted net income per share	76,009	74,342

Securities not included as they would have been antidilutive	38	19

Operating Segments (Tables)

3 Months Ended

Mar. 30, 2019

Segment Reporting [Abstract]

Schedule of Operating Results by Segment

The following table summarizes the operating results by reportable segment (dollars in thousands):



	Three Months Ended
	March 30, 2019												March 31, 2018
	Probe Cards			Systems			Corporate and Other			Total			Probe Cards			Systems			Corporate and Other			Total
Revenues	$	108,103		$	24,110		$	—		$	132,213		$	94,928		$	23,362		$	—		$	118,290
Gross profit	$	45,294		$	13,016		$	(5,789	)	$	52,521		$	40,071		$	11,135		$	(6,077	)	$	45,129
Gross margin	41.9		%	54.0		%	—		%	39.7		%	42.2		%	47.7		%	—		%	38.2		%

Disaggregation of Revenue by Segment

Certain revenue category information by reportable segment was as follows (in thousands):



	Three Months Ended
	March 30, 2019						March 31, 2018
	Probe Cards		Systems		Total		Probe Cards		Systems		Total
Market:
Foundry & Logic	$	71,580	$	—	$	71,580	$	58,439	$	—	$	58,439
DRAM	28,886		—		28,886		30,266		—		30,266
Flash	7,637		—		7,637		6,223		—		6,223
Systems	—		24,110		24,110		—		23,362		23,362
Total	$	108,103	$	24,110	$	132,213	$	94,928	$	23,362	$	118,290
Timing of revenue recognition:
Products transferred at a point in time	$	107,491	$	23,142	$	130,633	$	94,434	$	22,521	$	116,955
Services transferred over time	612		968		1,580		494		841		1,335
Total	$	108,103	$	24,110	$	132,213	$	94,928	$	23,362	$	118,290
Geographical region:
United States	$	27,655	$	6,608	$	34,263	$	26,488	$	6,375	$	32,863
South Korea	25,018		1,705		26,723		13,916		1,074		14,990
Taiwan	21,257		1,130		22,387		25,971		1,751		27,722
China	18,151		3,692		21,843		9,027		3,247		12,274
Japan	5,300		5,132		10,432		10,132		3,540		13,672
Europe	5,373		4,120		9,493		5,573		5,929		11,502
Asia-Pacific¹	2,790		473		3,263		3,490		1,325		4,815
Rest of the world	2,559		1,250		3,809		331		121		452
Total	$	108,103	$	24,110	$	132,213	$	94,928	$	23,362	$	118,290

¹ Asia-Pacific includes all countries in the region except China, Japan, South Korea, and Taiwan, which are disclosed separately.

Leases (Tables)

3 Months Ended

Mar. 30, 2019

Leases [Abstract]

Components of Lease Expense

The components of lease expense were as follows (in thousands):



	Three Months Ended
	March 30, 2019
Lease expense:
Operating lease expense	$	1,745
Short-term lease expense	17
Variable lease expense	419
	$	2,181

Schedule of Future Minimum Payments Under Leases

Future minimum payments under our non-cancelable operating leases were as follows as of March 30, 2019 (in thousands):



Fiscal Year	Amount
Remainder of 2019	$	4,950
2020	6,698
2021	5,819
2022	4,890
2023	4,432
Thereafter	20,406
	$	47,195

Basis of Presentation and New Accounting Pronouncements - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended
	Mar. 30, 2019	Dec. 28, 2019	Dec. 26, 2020	Dec. 29, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Performance obligations	$ 3.9
Contract assets	0.6			$ 0.3
Contract liabilities	7.6			$ 5.7
Revenue recognized included in contracts	$ 1.4
Forecast
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Expected to be recognized		74.00%	26.00%

Basis of Presentation and New Accounting Pronouncements - ASU 2016-18 Information (Details) - USD ($) $ in Thousands	Mar. 30, 2019	Dec. 29, 2018	Mar. 31, 2018	Dec. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Cash and cash equivalents as previously reported in the Condensed Consolidated Statements of Cash Flows	$ 105,759	$ 98,472
Current assets - Restricted cash	824	849
Restricted cash	1,130	1,225
Cash, cash equivalents and restricted cash as currently reported in the Condensed Consolidated Statements of Cash Flows	$ 107,713	$ 100,546	$ 95,382	$ 92,726

Concentration of Credit and Other Risks (Details) - Customer Concentration Risk	3 Months Ended		9 Months Ended	12 Months Ended
	Mar. 30, 2019	Mar. 31, 2018	Sep. 30, 2017	Dec. 29, 2018
Revenue from Contract with Customer [Member]
Concentration Risk [Line Items]
Concentration risk percentage	35.10%		24.10%
Revenue from Contract with Customer [Member] \| Intel Corporation
Concentration Risk [Line Items]
Concentration risk percentage	21.30%		14.00%
Revenue from Contract with Customer [Member] \| Micron Technology, Inc.
Concentration Risk [Line Items]
Concentration risk percentage		10.10%
Revenue from Contract with Customer [Member] \| Samsung [Member]
Concentration Risk [Line Items]
Concentration risk percentage	13.80%
Accounts Receivable \| Major Customer 1
Concentration Risk [Line Items]
Concentration risk percentage	16.70%			13.00%
Accounts Receivable \| Major Customer 2
Concentration Risk [Line Items]
Concentration risk percentage	10.70%			27.80%

Inventories (Details) - USD ($) $ in Thousands	Mar. 30, 2019	Dec. 29, 2018
Inventory Disclosure [Abstract]
Raw materials	$ 44,627	$ 43,380
Work-in-progress	22,356	20,431
Finished goods	16,233	13,895
Inventories	$ 83,216	$ 77,706

Goodwill and Intangible Assets - Goodwill (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 30, 2019	Dec. 29, 2018
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 189,214,000	$ 189,920,000
Foreign currency translation	(289,000)	(706,000)
Goodwill, ending balance	188,925,000	189,214,000
Goodwill impairment	0
Probe Cards
Goodwill [Roll Forward]
Goodwill, beginning balance	172,482,000	172,482,000
Foreign currency translation	0	0
Goodwill, ending balance	172,482,000	172,482,000
Systems
Goodwill [Roll Forward]
Goodwill, beginning balance	16,732,000	17,438,000
Foreign currency translation	(289,000)	(706,000)
Goodwill, ending balance	$ 16,443,000	$ 16,732,000

Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 30, 2019	Dec. 29, 2018
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross	$ 195,253	$ 195,577
Accumulated Amortization	134,868	127,937
Intangible Assets, Net	60,385	67,640
Existing developed technologies
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross	143,179	143,408
Accumulated Amortization	101,708	97,111
Intangible Assets, Net	41,471	46,297
Trade name
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross	11,997	12,023
Accumulated Amortization	10,206	9,173
Intangible Assets, Net	1,791	2,850
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross	40,077	40,146
Accumulated Amortization	22,954	21,653
Intangible Assets, Net	$ 17,123	$ 18,493

Goodwill and Intangible Assets - Amortization Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2019	Mar. 31, 2018	Dec. 29, 2018
Property, Plant and Equipment [Line Items]
Amortization of intangible assets	$ 7,090	$ 7,194
Finite-Lived Intangible Assets, Net, Amortization Expense, Rolling Maturity [Abstract]
Remainder of 2019	19,249
2019	23,318
2020	12,592
2021	3,484
2022	1,742
Intangible Assets, Net	60,385		$ 67,640
Cost of revenues
Property, Plant and Equipment [Line Items]
Amortization of intangible assets	4,719	5,157
Selling, general and administrative
Property, Plant and Equipment [Line Items]
Amortization of intangible assets	$ 2,371	$ 2,037

Accrued Liabilities (Details) - USD ($) $ in Thousands	Mar. 30, 2019	Dec. 29, 2018
Payables and Accruals [Abstract]
Accrued compensation and benefits	$ 13,135	$ 15,600
Accrued employee stock purchase plan contributions withheld	2,021	2,102
Accrued warranty	1,475	3,174
Accrued income and other taxes	2,906	4,222
Other accrued expenses	3,022	2,633
Accrued liabilities	$ 22,559	$ 27,731

Fair Value and Derivative Instruments - Fair Value Assets Measured on Recurring Basis (Details) - USD ($)	Mar. 30, 2019	Dec. 29, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable securities	$ 54,086,000
Total assets measured at fair value	57,590,000	$ 52,586,000
Derivative Liability	377,000
Liabilities measured at fair value on recurring basis		0
Interest rate swap derivative contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative contracts	427,000	871,000
Foreign exchange derivative contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable securities		50,531,000
Money market funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	3,077,000
Corporate Bond Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents		1,184,000
Marketable securities		30,674,000
US Treasury Bill Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable securities	15,450,000
Certificates of deposit
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable securities	959,000	7,997,000
Agency securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable securities	11,631,000	957,000
Agency Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable securities		8,608,000
Corporate bonds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable securities	26,046,000
Commercial paper
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable securities	0	2,295,000
Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable securities	15,450,000
Total assets measured at fair value	18,527,000	9,181,000
Derivative Liability	0
Level 1 \| Interest rate swap derivative contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative contracts	0	0
Level 1 \| Foreign exchange derivative contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable securities		7,997,000
Level 1 \| Money market funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	3,077,000
Level 1 \| Corporate Bond Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents		1,184,000
Marketable securities		0
Level 1 \| US Treasury Bill Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable securities	15,450,000
Level 1 \| Certificates of deposit
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable securities	0	7,997,000
Level 1 \| Agency securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable securities	0	0
Level 1 \| Agency Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable securities		0
Level 1 \| Corporate bonds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable securities	0
Level 1 \| Commercial paper
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable securities	0	0
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable securities	38,636,000
Total assets measured at fair value	39,063,000	43,405,000
Derivative Liability	377,000
Level 2 \| Money market funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	0
Level 2 \| Corporate Bond Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents		0
Marketable securities		30,674,000
Level 2 \| US Treasury Bill Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable securities	0
Level 2 \| Certificates of deposit
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable securities	959,000	0
Level 2 \| Agency securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable securities	11,631,000	957,000
Level 2 \| Agency Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable securities		8,608,000
Level 2 \| Corporate bonds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable securities	26,046,000
Level 2 \| Commercial paper
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable securities	0	2,295,000
Designated as Hedging Instrument \| Interest rate swap derivative contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative contracts	$ 427,000
Designated as Hedging Instrument \| Level 2 \| Interest rate swap derivative contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative contracts		871,000
Designated as Hedging Instrument \| Level 2 \| Foreign exchange derivative contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable securities		$ 42,534,000

Restructuring Charges - Restructuring Charges (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2019	Mar. 31, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 209	$ 0
Cost of revenues
Restructuring Cost and Reserve [Line Items]
Restructuring charges	120	0
Selling, general and administrative
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 89	$ 0

Fair Value and Derivative Instruments - Impact of Cash Flow Hedges and Derivatives (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2019	Mar. 31, 2018	Dec. 29, 2018
Interest Rate Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	$ 427		$ 871
Designated as Hedging Instrument
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)		$ 0
Designated as Hedging Instrument \| Interest Rate Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	427
Designated as Hedging Instrument \| Interest Rate Contracts \| Cash Flow Hedging
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amount of Gain or (Loss) Recognized in OCI on Derivative (Effective Portion)	(28)	255
Designated as Hedging Instrument \| Interest Rate Contracts \| Cash Flow Hedging \| Other Income (Expense), Net [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	$ (208)	$ 132

Restructuring Charges - Changes to the Restructuring Accrual (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2019	Mar. 31, 2018
Restructuring Reserve [Roll Forward]
Accrual at beginning of period	$ 20
Restructuring charges	209	$ 0
Non-cash settlement	(134)
Accrual at end of period	95
Employee Severance and Benefits
Restructuring Reserve [Roll Forward]
Accrual at beginning of period	20
Restructuring charges	75
Non-cash settlement	0
Accrual at end of period	95
Other Costs
Restructuring Reserve [Roll Forward]
Accrual at beginning of period	0
Restructuring charges	134
Non-cash settlement	(134)
Accrual at end of period	$ 0

Fair Value and Derivative Instruments - Foreign Currency Forward Contracts (Details) $ in Thousands, $ in Thousands	3 Months Ended
	Mar. 30, 2019 USD ($)	Sep. 29, 2018 USD ($)	Sep. 29, 2018 TWD ($)
Derivative [Line Items]
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	$ 400
Derivatives Not Designated as Hedging Instruments
Derivative [Line Items]
Contract amount (in various currencies)		$ (8,903)
Buy \| Korean Won \| Derivatives Not Designated as Hedging Instruments
Derivative [Line Items]
Contract amount (in various currencies)		(3,320)	$ (2,511)
Buy \| Japanese Yen \| Derivatives Not Designated as Hedging Instruments
Derivative [Line Items]
Contract amount (in various currencies)		(2,932)	(324,310)
Buy \| Korean Won \| Derivatives Not Designated as Hedging Instruments
Derivative [Line Items]
Contract amount (in various currencies)		$ (2,651)	$ (2,982,606)

Fair Value and Derivative Instruments - Gains and Losses Related to Non-designated Derivative Instruments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2019	Mar. 31, 2018
Derivatives Not Designated as Hedging Instruments \| Derivatives Not Designated as Hedging Instruments \| Location of Gain Recognized on Derivatives
Derivatives, Fair Value [Line Items]
Derivatives Not Designated as Hedging Instruments	$ 314	$ 862

Fair Value and Derivative Instruments - Assets Measured at Fair Value on a Non-Recurring Basis (Details) - USD ($)	Mar. 30, 2019	Dec. 29, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities measured at fair value on recurring basis		$ 0
Assets measured at fair value on non-recurring basis	$ 57,590,000	52,586,000
Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value on non-recurring basis	$ 0	$ 0

Fair Value and Derivative Instruments - Impact of Foreign Exchange Derivattive Contracts Designated as Cash Flow Hedges (Details) - Designated as Hedging Instrument - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2019	Mar. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)		$ 0
Derivatives Not Designated as Hedging Instruments
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized in OCI on Derivative (Effective Portion)	$ (435)	$ 0
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	(58)
Derivatives Not Designated as Hedging Instruments \| Cost of revenues
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	(32)
Derivatives Not Designated as Hedging Instruments \| Research and development
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	(19)
Derivatives Not Designated as Hedging Instruments \| Selling, general and administrative
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	$ (7)

Warranty (Details) - USD ($) $ in Thousands	3 Months Ended
Warranty (Details) - USD ($) $ in Thousands	Mar. 30, 2019	Mar. 31, 2018
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]
Balance at beginning of period	$ 2,102	$ 3,662
Accruals	889	1,025
Settlements	(970)	(1,848)
Balance at end of period	$ 2,021	$ 2,839

Stockholders' Equity - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 30, 2019	Feb. 28, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amount remaining for future repurchases	$ 6,000,000
Equity Incentive Plan \| Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total fair value of restricted stock units vested during the period	$ 700,000
Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase program authorized amount		$ 25,000,000

Stockholders' Equity - Restricted Stock Unit Activity (Details) - Equity Incentive Plan - Restricted Stock Units	3 Months Ended
	Mar. 30, 2019 $ / shares shares
Units
Beginning balance (in shares) \| shares	3,102,226
Awards vested (in shares) \| shares	(47,696)
Awards canceled (in shares) \| shares	(17,501)
Ending balance (in shares) \| shares	3,037,029
Weighted Average Grant Date Fair Value
Beginning Balance (in dollars per share) \| $ / shares	$ 12.79
Awards vested (in dollars per share) \| $ / shares	10.17
Awards canceled (in dollars per share) \| $ / shares	12.77
Ending Balance (in dollars per share) \| $ / shares	$ 12.83

Stockholders' Equity - Stock Option Activity (Details) - Equity Incentive Plan $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 30, 2019 USD ($) $ / shares shares
Options Outstanding
Outstanding, beginning of period (In shares) \| shares	524,725
Options exercised (In shares) \| shares	(19,207)
Outstanding, end of period (In shares) \| shares	505,518
Exercisable (In shares) \| shares	505,518
Weighted Average Exercise Price
Outstanding, beginning of period (In dollars per share) \| $ / shares	$ 8.00
Options exercised (In dollars per share) \| $ / shares	4.69
Outstanding, end of period (In dollars per share) \| $ / shares	8.12
Exercisable (In dollars per share) \| $ / shares	$ 8.12
Additional Disclosures
Outstanding, weighted average remaining contractual life	2 years 10 months 17 days
Exercisable, weighted average remaining contractual life	2 years 10 months 17 days
Outstanding, aggregate intrinsic value \| $	$ 4,028,192
Exercisable, aggregate intrinsic value \| $	$ 4,028,192
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number \| shares	505,518
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price \| $ / shares	$ 8.12
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term	2 years 10 months 17 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value \| $	$ 4,028,192

Stockholders' Equity - ESPP Activity (Details) - Employee stock purchase plan	3 Months Ended
	Mar. 30, 2019 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued under ESPP (In shares) \| shares	301,497
Weighted average per share purchase price (in dollars per share)	$ 12.18
Weighted average per share discount from the fair value of our common stock on the date of issuance (in dollars per share)	$ 4.85

Stockholders' Equity - Stock-Based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2019	Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation	$ 5,295	$ 3,756
Cost of revenues
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation	950	920
Research and development
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation	1,519	1,302
Selling, general and administrative
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation	$ 2,826	$ 1,534

Stockholders' Equity - Unrecognized Compensation Costs (Details) $ in Thousands	3 Months Ended
	Mar. 30, 2019 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized stock-based compensation expense	$ 26,144
Average expected recognition period
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized expense, other than options	$ 20,178
Average expected recognition period	1 year 10 months 12 days
Performance restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized expense, other than options	$ 4,991
Average expected recognition period	1 year 11 months 26 days
Employee stock purchase plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized expense, other than options	$ 975
Average expected recognition period	10 months 3 days

Net Income (Loss) per Share (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Mar. 30, 2019	Mar. 31, 2018	Sep. 30, 2017
Earnings Per Share [Abstract]
Weighted-average shares used in computing basic net income (loss) per share (In shares)	74,362	72,826	72,826
Add potentially dilutive securities (In shares)	1,647	1,516
Weighted-average shares used in computing diluted net income per share (In shares)	76,009	74,342
Anti-dilutive securities (In shares)	38	19

Operating Segments - Additional Information (Details)	3 Months Ended
Operating Segments - Additional Information (Details)	Mar. 30, 2019 segment
Segment Reporting [Abstract]
Number of reportable segments	2

Operating Segments - Operating Results by Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 30, 2019	Mar. 31, 2018	Sep. 30, 2017
Segment Reporting Information [Line Items]
Revenues	$ 132,213	$ 118,290	$ 118,290
Gross profit	$ 52,521	$ 45,129	45,129
Gross margin	39.70%	38.20%
Operating income (loss)	$ 7,614		$ 3,634
Probe Cards
Segment Reporting Information [Line Items]
Revenues	108,103	$ 94,928
Systems
Segment Reporting Information [Line Items]
Revenues	24,110	23,362
Corporate and Other
Segment Reporting Information [Line Items]
Revenues	0	0
Gross profit	$ (5,789)	$ (6,077)
Gross margin	0.00%	0.00%
Operating Segments \| Probe Cards
Segment Reporting Information [Line Items]
Revenues	$ 108,103	$ 94,928
Gross profit	$ 45,294	$ 40,071
Gross margin	41.90%	42.20%
Operating Segments \| Systems
Segment Reporting Information [Line Items]
Revenues	$ 24,110	$ 23,362
Gross profit	$ 13,016	$ 11,135
Gross margin	54.00%	47.70%

Operating Segments - Revenue by Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 30, 2019	Mar. 31, 2018	Sep. 30, 2017
Disaggregation of Revenue [Line Items]
Revenues	$ 132,213	$ 118,290	$ 118,290
Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	108,103	94,928
Systems
Disaggregation of Revenue [Line Items]
Revenues	24,110	23,362
Corporate and Other
Disaggregation of Revenue [Line Items]
Revenues	0	0
United States
Disaggregation of Revenue [Line Items]
Revenues	34,263	32,863
United States \| Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	27,655	26,488
United States \| Systems
Disaggregation of Revenue [Line Items]
Revenues	6,608	6,375
Taiwan
Disaggregation of Revenue [Line Items]
Revenues	22,387	27,722
Taiwan \| Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	21,257	25,971
Taiwan \| Systems
Disaggregation of Revenue [Line Items]
Revenues	1,130	1,751
CHINA
Disaggregation of Revenue [Line Items]
Revenues	21,843	12,274
CHINA \| Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	18,151	9,027
CHINA \| Systems
Disaggregation of Revenue [Line Items]
Revenues	3,692	3,247
South Korea
Disaggregation of Revenue [Line Items]
Revenues	26,723	14,990
South Korea \| Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	25,018	13,916
South Korea \| Systems
Disaggregation of Revenue [Line Items]
Revenues	1,705	1,074
Asia-Pacific
Disaggregation of Revenue [Line Items]
Revenues	3,263	4,815
Asia-Pacific \| Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	2,790	3,490
Asia-Pacific \| Systems
Disaggregation of Revenue [Line Items]
Revenues	473	1,325
Europe
Disaggregation of Revenue [Line Items]
Revenues	9,493	11,502
Europe \| Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	5,373	5,573
Europe \| Systems
Disaggregation of Revenue [Line Items]
Revenues	4,120	5,929
Japan
Disaggregation of Revenue [Line Items]
Revenues	10,432	13,672
Japan \| Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	5,300	10,132
Japan \| Systems
Disaggregation of Revenue [Line Items]
Revenues	5,132	3,540
Rest of the world
Disaggregation of Revenue [Line Items]
Revenues	3,809	452
Rest of the world \| Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	2,559	331
Rest of the world \| Systems
Disaggregation of Revenue [Line Items]
Revenues	1,250	121
Products transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenues	130,633	116,955
Products transferred at a point in time \| Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	107,491	94,434
Products transferred at a point in time \| Systems
Disaggregation of Revenue [Line Items]
Revenues	23,142	22,521
Services transferred over time
Disaggregation of Revenue [Line Items]
Revenues	1,580	1,335
Services transferred over time \| Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	612	494
Services transferred over time \| Systems
Disaggregation of Revenue [Line Items]
Revenues	968	841
Foundry & Logic
Disaggregation of Revenue [Line Items]
Revenues	71,580	58,439
Foundry & Logic \| Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	71,580	58,439
Foundry & Logic \| Systems
Disaggregation of Revenue [Line Items]
Revenues	0	0
DRAM
Disaggregation of Revenue [Line Items]
Revenues	28,886	30,266
DRAM \| Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	28,886	30,266
DRAM \| Systems
Disaggregation of Revenue [Line Items]
Revenues	0	0
Flash
Disaggregation of Revenue [Line Items]
Revenues	7,637	6,223
Flash \| Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	7,637	6,223
Flash \| Systems
Disaggregation of Revenue [Line Items]
Revenues	0	0
Systems
Disaggregation of Revenue [Line Items]
Revenues	24,110	23,362
Systems \| Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	0	0
Systems \| Systems
Disaggregation of Revenue [Line Items]
Revenues	24,110	23,362
Operating Segments \| Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	108,103	94,928
Operating Segments \| Systems
Disaggregation of Revenue [Line Items]
Revenues	$ 24,110	$ 23,362

Leases - Narrative (Details)	Mar. 30, 2019
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Renewal Term	20 years
Operating Lease, Weighted Average Remaining Lease Term	8 years
Operating Lease, Weighted Average Discount Rate, Percent	4.70%
Minimum
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Term of Contract	1 year
Maximum
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Term of Contract	10 years
Automobiles \| Minimum
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Term of Contract	1 year
Automobiles \| Maximum
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Term of Contract	4 years

Leases - Components of Lease Expense (Details) $ in Thousands	3 Months Ended
	Mar. 30, 2019 USD ($)
Leases [Abstract]
Operating lease expense	$ 1,745
Short-term lease expense	17
Variable lease expense	419
Lease, Cost	$ 2,181

Leases - Schedule of Future Minimum Payments Under Leases (Details) $ in Thousands	Mar. 30, 2019 USD ($)
Leases [Abstract]
Remainder of 2019	$ 4,950
2020	6,698
2021	5,819
2022	4,890
2023	4,432
Thereafter	20,406
Lessee, Operating Lease, Liability, Payments, Due	$ 47,195

Revenue (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended
Revenue (Details) - USD ($) $ in Millions	Mar. 30, 2019	Dec. 28, 2019	Dec. 26, 2020	Dec. 29, 2018
Disaggregation of Revenue [Line Items]
Performance obligations	$ 3.9
Contract assets	0.6			$ 0.3
Contract with Customer, Liability	7.6			$ 5.7
Revenue recognized included in contracts	$ 1.4
Forecast
Disaggregation of Revenue [Line Items]
Expected to be recognized		74.00%	26.00%