FormFactor (FORM) 10-Q 2 Aug 22 2022 Q2 Quarterly report Financial data

Cover Page

Cover Page - shares	6 Months Ended
	Jun. 25, 2022	Jul. 27, 2022
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 25, 2022
Document Transition Report	false
Entity File Number	000-50307
Entity Registrant Name	FormFactor, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	13-3711155
Entity Address, Address Line One	7005 Southfront Road
Entity Address, City or Town	Livermore
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	94551
City Area Code	925
Local Phone Number	290-4000
Title of 12(b) Security	Common stock, $0.001 par value
Trading Symbol	FORM
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		77,132,681
Amendment Flag	false
Entity Central Index Key	0001039399
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q2

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 25, 2022	Dec. 25, 2021
Current assets:
Cash and cash equivalents	$ 136,395	$ 151,010
Marketable securities	129,919	125,055
Accounts receivable, net of allowance for credit losses of $193 and $195	107,726	115,541
Inventories, net	143,475	111,548
Restricted cash	2,102	2,233
Prepaid expenses and other current assets	17,447	18,652
Total current assets	537,064	524,039
Restricted cash	1,802	2,099
Operating lease, right-of-use-assets	33,499	35,210
Property, plant and equipment, net of accumulated depreciation	157,814	146,555
Goodwill	212,357	212,299
Intangibles, net	30,872	36,342
Deferred tax assets	65,059	61,995
Other assets	3,980	1,981
Total assets	1,042,447	1,020,520
Current liabilities:
Accounts payable	60,927	57,862
Accrued liabilities	54,835	50,836
Current portion of term loans, net of unamortized issuance costs	4,725	8,931
Deferred revenue	31,255	23,224
Operating lease liabilities	7,843	7,901
Total current liabilities	159,585	148,754
Term loans, less current portion, net of unamortized issuance costs	14,915	15,434
Deferred tax liabilities	2,909	3,623
Long-term operating lease liabilities	29,511	31,009
Other liabilities	5,542	5,920
Total liabilities	212,462	204,740
Stockholders’ equity:
Common stock, $0.001 par value	77	78
Additional paid-in capital	860,584	898,945
Accumulated other comprehensive loss	(8,996)	(1,449)
Accumulated deficit	(21,680)	(81,794)
Total stockholders’ equity	829,985	815,780
Total liabilities and stockholders’ equity	$ 1,042,447	$ 1,020,520

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Jun. 25, 2022	Dec. 25, 2021
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 193	$ 195
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)	77,194,733	78,240,506
Common stock, shares outstanding (in shares)	77,194,733	78,240,506

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 25, 2022	Jun. 26, 2021	Jun. 25, 2022	Jun. 26, 2021
Income Statement [Abstract]
Revenues	$ 203,907	$ 188,076	$ 401,081	$ 374,712
Cost of revenues	109,538	111,793	212,488	221,723
Gross profit	94,369	76,283	188,593	152,989
Operating expenses:
Research and development	28,317	25,454	55,451	49,500
Selling, general and administrative	33,406	30,479	66,312	60,494
Total operating expenses	61,723	55,933	121,763	109,994
Operating income	32,646	20,350	66,830	42,995
Interest income	300	148	438	342
Interest expense	(119)	(116)	(311)	(296)
Other income (expense), net	551	(194)	743	(22)
Income before income taxes	33,378	20,188	67,700	43,019
Provision for income taxes	3,136	2,283	7,586	5,489
Net income	$ 30,242	$ 17,905	$ 60,114	$ 37,530
Net income per share:
Basic (in dollars per share)	$ 0.39	$ 0.23	$ 0.77	$ 0.48
Diluted (in dollars per share)	$ 0.38	$ 0.23	$ 0.76	$ 0.47
Weighted-average number of shares used in per share calculations:
Basic (in shares)	77,897	77,463	78,071	77,530
Diluted (in shares)	79,210	79,466	79,423	79,621

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 25, 2022	Jun. 26, 2021	Jun. 25, 2022	Jun. 26, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 30,242	$ 17,905	$ 60,114	$ 37,530
Other comprehensive income (loss), net of tax:
Translation adjustments and other	(3,856)	632	(6,554)	(1,747)
Unrealized losses on available-for-sale marketable securities	(547)	(97)	(1,751)	(228)
Unrealized gains (losses) on derivative instruments	(116)	(89)	758	(315)
Other comprehensive income (loss), net of tax	(4,519)	446	(7,547)	(2,290)
Comprehensive income	$ 25,723	$ 18,351	$ 52,567	$ 35,240

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Treasury Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit
Beginning balance (in shares) at Dec. 26, 2020		77,437,997
Beginning balance, treasury stock (in shares) at Dec. 26, 2020			0
Beginning balance at Dec. 26, 2020	$ 744,084	$ 78	$ 0	$ 903,838	$ 5,886	$ (165,718)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock under the Employee Stock Purchase Plan (in shares)		228,784
Issuance of common stock under the Employee Stock Purchase Plan	5,065			5,065
Issuance of common stock pursuant to exercise of options (in shares)		100,000
Issuance of common stock pursuant to exercise of options	844	$ 0		844
Issuance of common stock pursuant to vesting of restricted stock units, net of stock withheld for tax (in shares)		308,219
Issuance of common stock pursuant to vesting of restricted stock units, net of stock withheld for tax	(5,261)	$ 0		(5,261)
Purchase of common stock retired through repurchase program (in shares)		620,200
Purchase and retirement of common stock through repurchase program	(23,951)	$ (1)		(23,950)
Stock-based compensation	13,526			13,526
Other comprehensive income (loss)	(2,290)				(2,290)
Net income	37,530					37,530
Ending balance (in shares) at Jun. 26, 2021		77,454,800
Ending balance, treasury stock (in shares) at Jun. 26, 2021			0
Ending balance at Jun. 26, 2021	769,547	$ 77	$ 0	894,062	3,596	(128,188)
Beginning balance (in shares) at Dec. 26, 2020		77,437,997
Beginning balance, treasury stock (in shares) at Dec. 26, 2020			0
Beginning balance at Dec. 26, 2020	$ 744,084	$ 78	$ 0	903,838	5,886	(165,718)
Ending balance (in shares) at Dec. 25, 2021	78,240,506	78,240,506
Ending balance at Dec. 25, 2021	$ 815,780	$ 78		898,945	(1,449)	(81,794)
Beginning balance (in shares) at Mar. 27, 2021		77,758,530
Beginning balance, treasury stock (in shares) at Mar. 27, 2021			(136,402)
Beginning balance at Mar. 27, 2021	766,533	$ 78	$ (5,738)	915,136	3,150	(146,093)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock pursuant to exercise of options (in shares)		50,000
Issuance of common stock pursuant to exercise of options	422			422
Issuance of common stock pursuant to vesting of restricted stock units, net of stock withheld for tax (in shares)		266,470
Issuance of common stock pursuant to vesting of restricted stock units, net of stock withheld for tax	(4,120)	$ 0		(4,120)
Purchase of common stock retired through repurchase program (in shares)		620,200	136,402
Purchase and retirement of common stock through repurchase program	(18,213)	$ (1)	$ 5,738	(23,950)
Stock-based compensation	6,574			6,574
Other comprehensive income (loss)	446				446
Net income	17,905					17,905
Ending balance (in shares) at Jun. 26, 2021		77,454,800
Ending balance, treasury stock (in shares) at Jun. 26, 2021			0
Ending balance at Jun. 26, 2021	$ 769,547	$ 77	$ 0	894,062	3,596	(128,188)
Beginning balance (in shares) at Dec. 25, 2021	78,240,506	78,240,506
Beginning balance at Dec. 25, 2021	$ 815,780	$ 78		898,945	(1,449)	(81,794)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock under the Employee Stock Purchase Plan (in shares)		157,642
Issuance of common stock under the Employee Stock Purchase Plan	5,645			5,645
Issuance of common stock pursuant to exercise of options (in shares)		6,000
Issuance of common stock pursuant to exercise of options	42			42
Issuance of common stock pursuant to vesting of restricted stock units, net of stock withheld for tax (in shares)		234,076
Issuance of common stock pursuant to vesting of restricted stock units, net of stock withheld for tax	(4,243)	$ 0		(4,243)
Purchase of common stock retired through repurchase program (in shares)		1,443,491
Purchase and retirement of common stock through repurchase program	(54,328)	$ (1)		(54,327)
Stock-based compensation	14,522			14,522
Other comprehensive income (loss)	(7,547)				(7,547)
Net income	$ 60,114					60,114
Ending balance (in shares) at Jun. 25, 2022	77,194,733	77,194,733
Ending balance at Jun. 25, 2022	$ 829,985	$ 77		860,584	(8,996)	(21,680)
Beginning balance (in shares) at Mar. 26, 2022		78,166,212
Beginning balance at Mar. 26, 2022	846,673	$ 78		902,994	(4,477)	(51,922)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock pursuant to vesting of restricted stock units, net of stock withheld for tax (in shares)		231,464
Issuance of common stock pursuant to vesting of restricted stock units, net of stock withheld for tax	(4,171)	$ 0		(4,171)
Purchase of common stock retired through repurchase program (in shares)		1,202,943
Purchase and retirement of common stock through repurchase program	(44,931)	$ (1)		(44,930)
Stock-based compensation	6,691			6,691
Other comprehensive income (loss)	(4,519)				(4,519)
Net income	$ 30,242					30,242
Ending balance (in shares) at Jun. 25, 2022	77,194,733	77,194,733
Ending balance at Jun. 25, 2022	$ 829,985	$ 77		$ 860,584	$ (8,996)	$ (21,680)

CONDENSED CONSOLIDATED STATEM_4

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 25, 2022	Jun. 26, 2021
Cash flows from operating activities:
Net income	$ 60,114	$ 37,530
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	14,146	12,678
Amortization	4,702	13,900
Reduction in the carrying amount of right-of-use assets	4,414	3,652
Stock-based compensation expense	13,878	13,665
Provision for excess and obsolete inventories	4,726	6,898
Non-cash restructuring charges	710	0
Gain on contingent consideration	0	(95)
Other adjustments to reconcile net income to net cash provided by operating activities	(567)	1,211
Changes in assets and liabilities:
Accounts receivable	5,530	(1,194)
Inventories	(32,268)	(20,388)
Prepaid expenses and other current assets	1,295	3,179
Other assets	(40)	(344)
Accounts payable	7,521	(2,028)
Accrued liabilities	4,102	(235)
Other liabilities	73	184
Deferred revenues	2,727	1,522
Operating lease liabilities	(4,262)	(3,980)
Net cash provided by operating activities	86,801	66,155
Cash flows from investing activities:
Acquisition of property, plant and equipment	(30,116)	(31,322)
Acquisition of business	(3,121)	0
Purchases of marketable securities	(52,344)	(71,186)
Purchase of promissory note receivable	1,000	0
Proceeds from maturities and sales of marketable securities	45,470	42,695
Net cash used in investing activities	(41,111)	(59,813)
Cash flows from financing activities:
Proceeds from issuances of common stock	5,687	5,909
Purchase of common stock through stock repurchase program	(54,328)	(23,951)
Tax withholdings related to net share settlements of equity awards	(4,243)	(5,261)
Payment of contingent consideration	0	(3,873)
Principal repayments on term loans	(4,379)	(4,740)
Net cash used in financing activities	(57,263)	(31,916)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(3,470)	(1,558)
Net decrease in cash, cash equivalents and restricted cash	(15,043)	(27,132)
Cash, cash equivalents and restricted cash, beginning of period	155,342	191,098
Cash, cash equivalents and restricted cash, end of period	140,299	163,966
Non-cash investing and financing activities:
Increase (decrease) in accounts payable and accrued liabilities related to property, plant and equipment purchases	(4,165)	2,906
Operating lease, right-of-use assets obtained in exchange for lease obligations	3,438	11,629
Supplemental disclosure of cash flow information:
Cash paid for income taxes, net	6,473	4,559
Cash paid for interest	294	339
Operating cash outflows from operating leases	4,379	4,352
Reconciliation of cash, cash equivalents and restricted cash:
Cash and cash equivalents	136,395	160,273
Restricted cash, current	2,102	1,857
Restricted cash, non-current	1,802	1,836
Total cash, cash equivalents and restricted cash	$ 140,299	$ 163,966

Basis of Presentation and New A

Basis of Presentation and New Accounting Pronouncements	6 Months Ended
	Jun. 25, 2022
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 (“SEC”). 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 condensed consolidated financial statements included herein should be read in conjunction with the consolidated financial statements and the notes thereto included in our 2021 Annual Report on Form 10-K filed with the SEC on February 18, 2022. 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 2022 and 2021 contain 53 weeks and 52 weeks, respectively, and the six months ended June 25, 2022 and June 26, 2021 each contained 26 weeks. Fiscal 2022 will end on December 31, 2022. Significant Accounting Policies Our significant accounting policies have not changed during the six months ended June 25, 2022 from those disclosed in our Annual Report on Form 10-K for the year ended December 25, 2021. Reclassifications Certain immaterial reclassifications were made to the prior year financial statements to conform to the current year presentation. New Accounting Pronouncements ASU 2020-04 In March 2020, the FASB issued ASU 2020-04, “Referenced Rate Reform (Topic 848) - Facilitation of the Effects of Reference Rate Reform on Financial Reporting.” The ASU provides temporary optional expedients and exceptions for applying generally accepted accounting principles to contract modifications and hedging relationships, subject to meeting certain criteria, that reference the London Interbank Offered Rate (“LIBOR”) or another reference rate expected to be discontinued. In January 2021, the FASB issued ASU 2021-01, “Reference Rate Reform (Topic 848),” which permits entities to apply optional expedients in Topic 848 to derivative instruments modified because of discounting transition resulting from reference rate reform. ASU 2020-04 became effective upon issuance and may be applied prospectively to contract modifications made on or before December 31, 2022. ASU 2021-01 became effective upon issuance and may be applied on a full retrospective basis as of any date from the beginning of an interim period that includes or is subsequent to March 12, 2020 or prospectively for contract modifications made on or before December 31, 2022. The Company has not yet applied the relief afforded by these standard amendments and is currently assessing contracts that will require modification due to reference rate reform to which these standard amendments may be applied. ASU 2021-08 In October 2021, the FASB issued ASU 2021-08, Business Combinations (Topic 805): Accounting for Contract Assets and Contract Liabilities from Contracts with Customers. The new guidance requires contract assets and contract liabilities acquired in a business combination to be recognized and measured by the acquirer on the acquisition date in accordance with Accounting Standards Codification 606, “Revenue from Contracts with Customers,” as if it had originated the contracts. The Company elected to early adopt on a prospective basis during the second quarter of fiscal 2022. The adoption did not have a material effect on the Company's Consolidated Financial Statements.

Concentration of Credit and Oth

Concentration of Credit and Other Risks	6 Months Ended
	Jun. 25, 2022
Risks and Uncertainties [Abstract]
Concentration of Credit and Other Risks	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 Six Months Ended June 25, June 26, June 25, June 26, Intel Corporation 20.9 % 16.2 % 20.9 % 22.1 % Samsung Electronics., LTD. * 14.7 % * * Taiwan Semiconductor Manufacturing Co., LTD. * 11.0 % * 11.2 % 20.9 % 41.9 % 20.9 % 33.3 %

Inventories, net

Inventories, net	6 Months Ended
	Jun. 25, 2022
Inventory Disclosure [Abstract]
Inventories, net	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): June 25, December 25, Raw materials $ 68,247 $ 57,673 Work-in-progress 52,619 35,935 Finished goods 22,609 17,940 $ 143,475 $ 111,548

Acquisitions

Acquisitions	6 Months Ended
	Jun. 25, 2022
Business Combination and Asset Acquisition [Abstract]
Acquisitions	Acquisition Woburn Acquisition On June 9, 2022, we acquired the assets of the dilution refrigerator product line of American ULT Cryogenics, formerly d/b/a JanisULT (“Woburn”), for total consideration of $3.1 million. This acquisition adds cryogen-free dilution refrigerators capable of cooling to sub-10 millikelvin to our product portfolio, which is required for operation of superconducting quantum computers. As of the reporting date, we have not completed the valuation of assets acquired and liabilities assumed. Upon the completion of purchase accounting, we expect certain amounts provisionally recorded as goodwill will be ultimately allocated to developed technologies, but at this time we do not have an estimate of the allocation of value between amortizing and non-amortizing intangible assets. We do expect that some amount of intangible assets provisionally recorded as goodwill will ultimately be allocated to an amortizing intangible asset. At the time such amount is estimable, we will record any amortization required between the acquisition date and the date at which the amounts become estimable. While we do not yet have a reasonable basis on which to record any such amortization, the impact to the financial statements as a whole is not expected to be material assuming typical lives of these assets and ranges of potential allocation of value. The amounts presented below represent provisional amounts of assets acquired and liabilities assumed, which are recorded based on the best information available, and are subject to revision as the fair value of the associated assets acquired and liabilities assumed are finalized. The total estimated purchase price has been provisionally allocated to the underlying assets acquired and liabilities assumed, as follows (in thousands): Amount Accounts receivable $ 178 Inventories 6,064 Property, plant and equipment 479 Prepaid expenses and other current assets 117 Other assets 28 Tangible assets acquired 6,866 Deferred revenue (5,513) Accounts payable and accrued liabilities (30) Total tangible assets acquired and liabilities assumed 1,323 Goodwill 1,798 Net Assets Acquired $ 3,121

Goodwill and Intangible Assets

Goodwill and Intangible Assets	6 Months Ended
	Jun. 25, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	Goodwill and Intangible Assets Goodwill by reportable segment was as follows (in thousands): Probe Cards Systems Total Goodwill, as of December 26, 2020 $ 178,072 $ 34,689 $ 212,761 Addition - Baldwin Park Acquisition 352 — 352 Addition - HPD Acquisition — 1,254 1,254 Foreign currency translation — (2,068) (2,068) Goodwill, as of December 25, 2021 178,424 33,875 212,299 Addition - Woburn Acquisition — 1,798 1,798 Foreign currency translation — (1,740) (1,740) Goodwill, as of June 25, 2022 $ 178,424 $ 33,933 $ 212,357 We have not recorded goodwill impairments for the six months ended June 25, 2022. Intangible assets were as follows (in thousands): June 25, 2022 December 25, 2021 Intangible Assets Gross Accumulated Net Gross Accumulated Net Existing developed technologies $ 170,627 $ 149,338 $ 21,289 $ 172,259 $ 148,784 $ 23,475 Customer relationships 50,827 41,966 8,861 51,270 39,254 12,016 Trade name 7,952 7,630 322 8,054 7,603 451 Backlog — — — 1,896 1,896 — In-process research and development 400 — 400 400 — 400 $ 229,806 $ 198,934 $ 30,872 $ 233,879 $ 197,537 $ 36,342 Amortization expense was included in our Condensed Consolidated Statements of Income as follows (in thousands): Three Months Ended Six Months Ended June 25, June 26, June 25, June 26, Cost of revenues $ 788 $ 5,505 $ 1,596 $ 10,595 Selling, general and administrative 1,545 1,590 3,106 3,305 $ 2,333 $ 7,095 $ 4,702 $ 13,900 The estimated future amortization of definite-lived intangible assets, excluding in-process research and development, is as follows (in thousands): Fiscal Year Amount Remainder of 2022 $ 4,650 2023 6,968 2024 4,390 2025 4,142 2026 3,134 Thereafter 7,188 $ 30,472

Accrued Liabilities

Accrued Liabilities	6 Months Ended
	Jun. 25, 2022
Payables and Accruals [Abstract]
Accrued Liabilities	Accrued Liabilities Accrued liabilities consisted of the following (in thousands): June 25, December 25, Accrued compensation and benefits $ 32,001 $ 29,706 Accrued income and other taxes 9,468 8,086 Accrued warranty 3,978 2,805 Employee stock purchase plan contributions withheld 4,789 4,693 Accrued restructuring charges 592 2,478 Other accrued expenses 4,007 3,068 $ 54,835 $ 50,836

Restructuring Charges

Restructuring Charges	6 Months Ended
	Jun. 25, 2022
Restructuring and Related Activities [Abstract]
Restructuring Charges	Restructuring Charges On September 25, 2021, we adopted restructuring plans to improve our business effectiveness and streamline our operations by consolidating certain manufacturing facilities for both the Probe Cards segment and the Systems segment. This included plans to consolidate or relocate certain leased locations in the United States to other locations in the United States, Germany and Asia. As a result of these changes to certain work locations, we have incurred, and expect to incur, personnel related costs to sever, relocate, or retain select employees. Additionally, this included plans to adjust capacity for certain product offerings, which resulted in contract termination costs to satisfy contract obligations. We expect the actions defined under these plans will be largely completed by the end of December 2022, except facilities charges which may extend beyond that time. These plans are expected to result in FormFactor recording restructuring and other charges in the aggregate amount of approximately $5.0 million to $8.5 million, estimated to be comprised primarily of $1.0 million to $2.0 million of severance and employee-related costs, $1.5 million to $2.5 million in contract and lease termination costs, $2.0 million to $3.0 million in inventory impairments, and $0.5 million to $1.0 million of cost related to impairment of leasehold improvements, facility exits, and other costs. Approximately $2.5 million to $4.5 million is expected within each of the Probe Cards and Systems segments, respectively. The Company has recognized to date restructuring and other charges in the aggregate amount of $5.0 million, comprised of $1.2 million of severance and employee-related costs, $1.5 million in contract and lease termination costs, $2.0 million in inventory impairments, and $0.3 million of cost related to impairment of leasehold improvements, facility exits and other costs. Restructuring charges by reportable segment included in our Condensed Consolidated Statements of Income were as follows (in thousands): Three Months Ended Six Months Ended June 25, 2022 June 25, 2022 Probe Cards Systems Total Probe Cards Systems Total Cost of revenues $ 227 $ 227 $ 454 $ 266 $ 327 $ 593 Research and development — 53 53 — 199 199 Selling, general and administrative — 74 74 3 99 102 $ 227 $ 354 $ 581 $ 269 $ 625 $ 894 Changes to the restructuring accrual in the six months ended June 25, 2022 were as follows (in thousands): Employee Severance Inventory Contract Total December 25, 2021 $ 1,028 $ — $ 1,450 $ 2,478 Restructuring charges 185 646 — 894 Cash payments (621) — (1,450) (2,071) Non-cash settlement — (646) — (709) June 25, 2022 $ 592 $ — $ — $ 592

Fair Value and Derivative Instr

Fair Value and Derivative Instruments	6 Months Ended
	Jun. 25, 2022
Fair Value Disclosures [Abstract]
Fair Value and Derivative Instruments	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 and six months ended June 25, 2022 or the year ended December 25, 2021. The carrying values of Cash, Accounts receivable, net, Restricted cash, Prepaid expenses and other current assets, Accounts payable, Accrued liabilities, and Term loans, net of unamortized issuance costs, approximate fair value due to their short maturities. No changes were made to our valuation techniques during the first six months of fiscal 2022. 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): June 25, 2022 Level 1 Level 2 Level 3 Total Assets: Cash equivalents: Money market funds $ 39,228 $ — $ — $ 39,228 Commercial paper — 3,393 — 3,393 U.S. agency securities — 2,558 — 2,558 U.S. treasuries 1,995 — — 1,995 41,223 5,951 — 47,174 Marketable securities: Corporate bonds — 64,930 — 64,930 U.S. treasuries 35,894 — — 35,894 Commercial paper — 22,480 — 22,480 U.S. agency securities — 5,912 — 5,912 Certificates of deposit — 703 — 703 35,894 94,025 — 129,919 Promissory note receivable — — 1,007 1,007 Interest rate swap derivative contracts — 1,990 — 1,990 Total assets $ 77,117 $ 101,966 $ 1,007 $ 180,090 Liabilities: Foreign exchange derivative contracts $ — $ (1,146) $ — $ (1,146) December 25, 2021 Level 1 Level 2 Level 3 Total Assets: Cash equivalents: Money market funds $ 9,526 $ — $ — $ 9,526 U.S. agency securities — 5,556 — 5,556 U.S. treasuries 2,500 — — 2,500 Commercial paper — 1,000 — 1,000 12,026 6,556 — 18,582 Marketable securities: Corporate bonds — 52,709 — 52,709 U.S. treasuries 38,985 — — 38,985 Commercial paper — 32,162 — 32,162 Certificates of deposit — 1,199 — 1,199 38,985 86,070 — 125,055 Interest rate swap derivative contracts — 629 — 629 Total assets $ 51,011 $ 93,255 $ — $ 144,266 Liabilities: Foreign exchange derivative contracts $ — $ (489) $ — $ (489) Interest rate swap derivative contracts — (55) — (55) Total liabilities $ — $ (544) $ — $ (544) 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 investments have a sufficient 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 loss 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. 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 loss 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. 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 June 25, 2022 will mature by the second quarter of fiscal 2023. The following table provides information about our foreign currency forward contracts outstanding as of June 25, 2022 (in thousands): Currency Contract Position Contract Amount Contract Amount Euro Dollar Buy (21,445) $ (24,117) Japanese Yen Sell 2,247,411 16,633 Korean Won Buy (1,010,988) (779) Taiwan Dollar Sell 28,890 974 Total USD notional amount of outstanding foreign exchange contracts $ (7,289) 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. Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis We measure and report our non-financial assets such as Property, plant and equipment, 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. Other than as discussed in Note 4, Acquisition , and Note 7, Restructuring Charges,

Warranty

Warranty	6 Months Ended
	Jun. 25, 2022
Product Warranties Disclosures [Abstract]
Warranty	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 regularly 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): Six Months Ended June 25, June 26, Balance at beginning of period $ 2,805 $ 3,918 Accruals 3,846 3,472 Settlements (2,673) (3,132) Balance at end of period $ 3,978 $ 4,258

Property, Plant, and Equipment,

Property, Plant, and Equipment, net	6 Months Ended
	Jun. 25, 2022
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment, net	Property, Plant and Equipment, net Property, plant and equipment, net consisted of the following (in thousands): June 25, December 25, Land $ 4,751 $ 4,751 Building and building improvements 44,429 41,722 Machinery and equipment 263,851 252,632 Computer equipment and software 45,727 44,667 Furniture and fixtures 7,434 7,293 Leasehold improvements 83,127 82,266 Sub-total 449,319 433,331 Less: Accumulated depreciation and amortization (323,779) (312,700) Net, property, plant and equipment 125,540 120,631 Construction-in-process 32,274 25,924 Total $ 157,814 $ 146,555

Stockholders_ Equity and Stock-

Stockholders’ Equity and Stock-Based Compensation	3 Months Ended
	Jun. 25, 2022
Equity [Abstract]
Stockholders’ Equity and Stock-Based Compensation	Stockholders’ Equity and Stock-Based Compensation Common Stock Repurchase Programs On October 26, 2020, our Board of Directors authorized a two-year program to repurchase up to $50 million of outstanding common stock to offset potential dilution from issuances of common stock under our stock-based compensation programs. During fiscal 2021 we repurchased and retired 622,400 shares of common stock for $24.0 million. During the six months ended June 25, 2022, we repurchased and retired 676,408 shares of common stock for $26.0 million, utilizing the remaining funds available for repurchase. On May 20, 2022, our Board of Directors authorized an additional program to repurchase up to $75 million of outstanding common stock, also with the primary purpose to offset potential dilution from issuances of common stock under our stock-based compensation programs. The share repurchase program will expire on May 20, 2024. During the three months ended June 25, 2022, we repurchased and retired 767,083 shares of common stock for $28.4 million under the program. As of June 25, 2022, $46.6 million remained available for future repurchases. Our policy related to repurchases of our common stock is to charge the excess of cost over par value to additional paid-in capital once the shares are retired. All repurchases were made in compliance with Rule 10b-18 under the Securities Exchange Act of 1934, as amended. 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 25, 2021 2,166,934 $ 28.63 Awards granted 63,697 41.25 Awards vested (338,825) 16.73 Awards forfeited (51,941) 30.23 RSUs at June 25, 2022 1,839,865 31.22 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 six months ended June 25, 2022. PRSUs are included as part of the RSU activity above. Employee Stock Purchase Plan Information related to activity under our Employee Stock Purchase Plan (“ESPP”) was as follows: Six Months Ended June 25, 2022 Shares issued 157,642 Weighted average per share purchase price $ 35.81 Weighted average per share discount from the fair value of our common stock on the date of issuance $ (6.93) Stock-Based Compensation Stock-based compensation was included in our Condensed Consolidated Statements of Income as follows (in thousands): Three Months Ended Six Months Ended June 25, June 26, June 25, June 26, Cost of revenues $ 734 $ 1,079 $ 1,812 $ 2,414 Research and development 1,695 1,663 3,681 3,352 Selling, general and administrative 3,929 3,846 8,385 7,899 Total stock-based compensation $ 6,358 $ 6,588 $ 13,878 $ 13,665 Unrecognized Compensation Costs At June 25, 2022, the unrecognized stock-based compensation was as follows (dollars in thousands): Unrecognized Expense Average Expected Recognition Period in Years Restricted stock units $ 27,430 1.80 Performance restricted stock units 7,202 1.74 Employee stock purchase plan 285 0.61 Total unrecognized stock-based compensation expense $ 34,917 1.77

Net Income per Share

Net Income per Share	6 Months Ended
	Jun. 25, 2022
Earnings Per Share [Abstract]
Net Income 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 Six Months Ended June 25, June 26, June 25, June 26, Weighted-average shares used in computing basic net income per share 77,897 77,463 78,071 77,530 Add potentially dilutive securities 1,313 2,003 1,352 2,091 Weighted-average shares used in computing diluted net income per share 79,210 79,466 79,423 79,621 Securities not included as they would have been antidilutive 23 128 — 118

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 25, 2022
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Leases See Note 14, Leases . Contractual Obligations and Commitments Our contractual obligations and commitments have not materially changed as of June 25, 2022 from those disclosed in our Annual Report on Form 10-K for the year ended December 25, 2021. Legal Matters

Leases

Leases	6 Months Ended
	Jun. 25, 2022
Leases [Abstract]
Leases	Leases We lease real estate space under non-cancelable operating lease agreements for commercial and industrial space, as well as for a portion of our corporate headquarters located in Livermore, California. Our leases have remaining terms of 1 to 7 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 3 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 6 years as of June 25, 2022 and the weighted-average discount rate was 3.69%. The components of lease expense were as follows (in thousands): Three Months Ended Six Months Ended June 25, June 26, June 25, June 26, Lease expense: Operating lease expense $ 2,183 $ 2,048 $ 4,404 $ 4,171 Short-term lease expense 76 45 116 82 Variable lease expense 677 426 1,135 963 $ 2,936 $ 2,519 $ 5,655 $ 5,216 Future minimum payments under our non-cancelable operating leases were as follows as of June 25, 2022 (in thousands): Fiscal Year Amount Remainder of 2022 $ 4,319 2023 7,564 2024 7,224 2025 7,187 2026 6,505 Thereafter 9,143 Total minimum lease payments 41,942 Less: interest (4,588) Present value of net minimum lease payments 37,354 Less: current portion (7,843) Total long-term operating lease liabilities $ 29,511

Revenue

Revenue	6 Months Ended
	Jun. 25, 2022
Revenue from Contract with Customer [Abstract]
Revenue	Revenue Transaction price allocated to the remaining performance obligations: On June 25, 2022, we had $9.7 million of remaining performance obligations, which were comprised of deferred service contracts and extended warranty contracts and contracts with overtime revenue recognition that are not yet delivered. We expect to recognize approximately 66.9% of our remaining performance obligations as revenue in the remainder of fiscal 2022, approximately 27.7% in fiscal 2023, and approximately 5.4% in fiscal 2024 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 credit losses. 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 June 25, 2022 and December 25, 2021 were $2.0 million and $0.9 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 and payments due 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 at the end of each reporting period as a component of Deferred revenue and Other liabilities. Contract liabilities as of June 25, 2022 and December 25, 2021 were $32.2 million and $24.2 million, respectively. During the six months ended June 25, 2022, we recognized $16.5 million of revenue that was included in contract liabilities as of December 25, 2021. 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 16, Operating Segments and Enterprise-Wide Information

Operating Segments and Enterpri

Operating Segments and Enterprise-Wide Information	6 Months Ended
	Jun. 25, 2022
Segment Reporting [Abstract]
Operating Segments and Enterprise-Wide Information	Operating Segments and Enterprise-Wide InformationOur 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 June 25, 2022 June 26, 2021 Probe Cards Systems Corporate and Other Total Probe Cards Systems Corporate and Other Total Revenues $ 167,708 $ 36,199 $ — $ 203,907 $ 153,641 $ 34,435 $ — $ 188,076 Gross profit 78,420 18,276 (2,327) 94,369 66,600 16,907 (7,224) 76,283 Gross margin 46.8 % 50.5 % 46.3 % 43.3 % 49.1 % 40.6 % Six Months Ended June 25, 2022 June 26, 2021 Probe Cards Systems Corporate and Other Total Probe Cards Systems Corporate and Other Total Revenues $ 327,691 $ 73,390 $ — $ 401,081 $ 312,539 $ 62,173 $ — $ 374,712 Gross profit $ 155,622 $ 37,683 $ (4,712) $ 188,593 $ 136,915 $ 30,506 $ (14,432) $ 152,989 Gross margin 47.5 % 51.3 % 47.0 % 43.8 % 49.1 % 40.8 % 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, inventory and fixed asset fair value adjustments due to acquisitions, share-based compensation, and restructuring charges 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 June 25, 2022 June 26, 2021 Probe Cards Systems Total Probe Cards Systems Total Market: Foundry & Logic $ 122,380 $ — $ 122,380 $ 103,726 $ — $ 103,726 DRAM 36,843 — 36,843 42,088 — 42,088 Flash 8,485 — 8,485 7,827 — 7,827 Systems — 36,199 36,199 — 34,435 34,435 Total $ 167,708 $ 36,199 $ 203,907 $ 153,641 $ 34,435 $ 188,076 Timing of revenue recognition: Products transferred at a point in time $ 166,701 $ 33,081 $ 199,782 $ 153,129 $ 30,884 $ 184,013 Products and services transferred over time 1,007 3,118 4,125 512 3,551 4,063 Total $ 167,708 $ 36,199 $ 203,907 $ 153,641 $ 34,435 $ 188,076 Geographical region: Taiwan $ 45,188 $ 4,832 $ 50,020 $ 46,737 $ 5,147 $ 51,884 China 40,578 9,157 49,735 23,996 7,831 31,827 United States 21,539 9,703 31,242 24,174 8,476 32,650 South Korea 27,418 1,337 28,755 35,426 751 36,177 Malaysia 16,157 87 16,244 3,034 161 3,195 Japan 6,716 3,221 9,937 3,477 4,227 7,704 Europe 3,824 4,267 8,091 6,466 5,544 12,010 Singapore 5,131 1,977 7,108 8,602 1,360 9,962 Rest of the world 1,157 1,618 2,775 1,729 938 2,667 Total $ 167,708 $ 36,199 $ 203,907 $ 153,641 $ 34,435 $ 188,076 Six Months Ended June 25, 2022 June 26, 2021 Probe Cards Systems Total Probe Cards Systems Total Market: Foundry & Logic $ 236,501 $ — $ 236,501 $ 217,136 $ — $ 217,136 DRAM 71,280 — 71,280 75,986 — 75,986 Flash 19,910 — 19,910 19,417 — 19,417 Systems — 73,390 73,390 — 62,173 62,173 Total $ 327,691 $ 73,390 $ 401,081 $ 312,539 $ 62,173 $ 374,712 Timing of revenue recognition: Products transferred at a point in time $ 325,537 $ 68,497 $ 394,034 $ 311,605 $ 55,555 $ 367,160 Products and services transferred over time 2,154 4,893 7,047 934 6,618 7,552 Total $ 327,691 $ 73,390 $ 401,081 $ 312,539 $ 62,173 $ 374,712 Geographical region: Taiwan $ 87,710 $ 15,379 $ 103,089 $ 91,471 $ 5,993 $ 97,464 China 73,369 14,765 88,134 61,827 12,625 74,452 United States 41,515 15,374 56,889 45,482 16,654 62,136 South Korea 52,299 3,957 56,256 53,427 1,835 55,262 Malaysia 37,674 769 38,443 22,922 203 23,125 Japan 11,501 7,818 19,319 8,726 8,299 17,025 Singapore 15,415 2,589 18,004 16,229 2,291 18,520 Europe 6,206 10,280 16,486 9,299 12,710 22,009 Rest of the world 2,002 2,459 4,461 3,156 1,563 4,719 Total $ 327,691 $ 73,390 $ 401,081 $ 312,539 $ 62,173 $ 374,712

Basis of Presentation and New_2

Basis of Presentation and New Accounting Pronouncements (Policies)	6 Months Ended
	Jun. 25, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of PresentationThe 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 (“SEC”). 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 condensed consolidated financial statements included herein should be read in conjunction with the consolidated financial statements and the notes thereto included in our 2021 Annual Report on Form 10-K filed with the SEC on February 18, 2022. 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	Fiscal Year We operate on a 52/53 week fiscal year, whereby the fiscal year ends on the last Saturday of December. Fiscal 2022 and 2021 contain 53 weeks and 52 weeks, respectively, and the six months ended June 25, 2022 and June 26, 2021 each contained 26 weeks. Fiscal 2022 will end on December 31, 2022.
New Accounting Pronouncements	New Accounting Pronouncements ASU 2020-04 In March 2020, the FASB issued ASU 2020-04, “Referenced Rate Reform (Topic 848) - Facilitation of the Effects of Reference Rate Reform on Financial Reporting.” The ASU provides temporary optional expedients and exceptions for applying generally accepted accounting principles to contract modifications and hedging relationships, subject to meeting certain criteria, that reference the London Interbank Offered Rate (“LIBOR”) or another reference rate expected to be discontinued. In January 2021, the FASB issued ASU 2021-01, “Reference Rate Reform (Topic 848),” which permits entities to apply optional expedients in Topic 848 to derivative instruments modified because of discounting transition resulting from reference rate reform. ASU 2020-04 became effective upon issuance and may be applied prospectively to contract modifications made on or before December 31, 2022. ASU 2021-01 became effective upon issuance and may be applied on a full retrospective basis as of any date from the beginning of an interim period that includes or is subsequent to March 12, 2020 or prospectively for contract modifications made on or before December 31, 2022. The Company has not yet applied the relief afforded by these standard amendments and is currently assessing contracts that will require modification due to reference rate reform to which these standard amendments may be applied. ASU 2021-08 In October 2021, the FASB issued ASU 2021-08, Business Combinations (Topic 805): Accounting for Contract Assets and Contract Liabilities from Contracts with Customers. The new guidance requires contract assets and contract liabilities acquired in a business combination to be recognized and measured by the acquirer on the acquisition date in accordance with Accounting Standards Codification 606, “Revenue from Contracts with Customers,” as if it had originated the contracts. The Company elected to early adopt on a prospective basis during the second quarter of fiscal 2022. The adoption did not have a material effect on the Company's Consolidated Financial Statements.
Fair Value	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 and six months ended June 25, 2022 or the year ended December 25, 2021. The carrying values of Cash, Accounts receivable, net, Restricted cash, Prepaid expenses and other current assets, Accounts payable, Accrued liabilities, and Term loans, net of unamortized issuance costs, approximate fair value due to their short maturities. No changes were made to our valuation techniques during the first six months of fiscal 2022. Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis We measure and report our non-financial assets such as Property, plant and equipment, 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

Concentration of Credit and O_2

Concentration of Credit and Other Risks (Tables)	6 Months Ended
	Jun. 25, 2022
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 Six Months Ended June 25, June 26, June 25, June 26, Intel Corporation 20.9 % 16.2 % 20.9 % 22.1 % Samsung Electronics., LTD. * 14.7 % * * Taiwan Semiconductor Manufacturing Co., LTD. * 11.0 % * 11.2 % 20.9 % 41.9 % 20.9 % 33.3 %

Inventories, net (Tables)

Inventories, net (Tables)	6 Months Ended
	Jun. 25, 2022
Inventory Disclosure [Abstract]
Schedule of Inventory Components	Inventories, net, consisted of the following (in thousands): June 25, December 25, Raw materials $ 68,247 $ 57,673 Work-in-progress 52,619 35,935 Finished goods 22,609 17,940 $ 143,475 $ 111,548

Acquisitions (Tables)

Acquisitions (Tables)	6 Months Ended
	Jun. 25, 2022
Business Combination and Asset Acquisition [Abstract]
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	The total estimated purchase price has been provisionally allocated to the underlying assets acquired and liabilities assumed, as follows (in thousands): Amount Accounts receivable $ 178 Inventories 6,064 Property, plant and equipment 479 Prepaid expenses and other current assets 117 Other assets 28 Tangible assets acquired 6,866 Deferred revenue (5,513) Accounts payable and accrued liabilities (30) Total tangible assets acquired and liabilities assumed 1,323 Goodwill 1,798 Net Assets Acquired $ 3,121

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	6 Months Ended
	Jun. 25, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill by Reportable Segments	Goodwill by reportable segment was as follows (in thousands): Probe Cards Systems Total Goodwill, as of December 26, 2020 $ 178,072 $ 34,689 $ 212,761 Addition - Baldwin Park Acquisition 352 — 352 Addition - HPD Acquisition — 1,254 1,254 Foreign currency translation — (2,068) (2,068) Goodwill, as of December 25, 2021 178,424 33,875 212,299 Addition - Woburn Acquisition — 1,798 1,798 Foreign currency translation — (1,740) (1,740) Goodwill, as of June 25, 2022 $ 178,424 $ 33,933 $ 212,357
Schedule of Intangible Assets	Intangible assets were as follows (in thousands): June 25, 2022 December 25, 2021 Intangible Assets Gross Accumulated Net Gross Accumulated Net Existing developed technologies $ 170,627 $ 149,338 $ 21,289 $ 172,259 $ 148,784 $ 23,475 Customer relationships 50,827 41,966 8,861 51,270 39,254 12,016 Trade name 7,952 7,630 322 8,054 7,603 451 Backlog — — — 1,896 1,896 — In-process research and development 400 — 400 400 — 400 $ 229,806 $ 198,934 $ 30,872 $ 233,879 $ 197,537 $ 36,342
Schedule of Amortization Expense	Amortization expense was included in our Condensed Consolidated Statements of Income as follows (in thousands): Three Months Ended Six Months Ended June 25, June 26, June 25, June 26, Cost of revenues $ 788 $ 5,505 $ 1,596 $ 10,595 Selling, general and administrative 1,545 1,590 3,106 3,305 $ 2,333 $ 7,095 $ 4,702 $ 13,900
Schedule of Estimated Amortization of Intangible Assets	The estimated future amortization of definite-lived intangible assets, excluding in-process research and development, is as follows (in thousands): Fiscal Year Amount Remainder of 2022 $ 4,650 2023 6,968 2024 4,390 2025 4,142 2026 3,134 Thereafter 7,188 $ 30,472

Accrued Liabilities (Tables)

Accrued Liabilities (Tables)	6 Months Ended
	Jun. 25, 2022
Payables and Accruals [Abstract]
Schedule of Accrued Liabilities	Accrued liabilities consisted of the following (in thousands): June 25, December 25, Accrued compensation and benefits $ 32,001 $ 29,706 Accrued income and other taxes 9,468 8,086 Accrued warranty 3,978 2,805 Employee stock purchase plan contributions withheld 4,789 4,693 Accrued restructuring charges 592 2,478 Other accrued expenses 4,007 3,068 $ 54,835 $ 50,836

Restructuring Charges (Tables)

Restructuring Charges (Tables)	6 Months Ended
	Jun. 25, 2022
Restructuring and Related Activities [Abstract]
Restructuring Costs by Reportable Segment	Restructuring charges by reportable segment included in our Condensed Consolidated Statements of Income were as follows (in thousands): Three Months Ended Six Months Ended June 25, 2022 June 25, 2022 Probe Cards Systems Total Probe Cards Systems Total Cost of revenues $ 227 $ 227 $ 454 $ 266 $ 327 $ 593 Research and development — 53 53 — 199 199 Selling, general and administrative — 74 74 3 99 102 $ 227 $ 354 $ 581 $ 269 $ 625 $ 894
Schedule of Restructuring Accrual Activity	Changes to the restructuring accrual in the six months ended June 25, 2022 were as follows (in thousands): Employee Severance Inventory Contract Total December 25, 2021 $ 1,028 $ — $ 1,450 $ 2,478 Restructuring charges 185 646 — 894 Cash payments (621) — (1,450) (2,071) Non-cash settlement — (646) — (709) June 25, 2022 $ 592 $ — $ — $ 592

Fair Value and Derivative Ins_2

Fair Value and Derivative Instruments (Tables)	6 Months Ended
	Jun. 25, 2022
Fair Value Disclosures [Abstract]
Schedule of Fair Value Assets Measured on Recurring Basis	Assets and liabilities measured at fair value on a recurring basis were as follows (in thousands): June 25, 2022 Level 1 Level 2 Level 3 Total Assets: Cash equivalents: Money market funds $ 39,228 $ — $ — $ 39,228 Commercial paper — 3,393 — 3,393 U.S. agency securities — 2,558 — 2,558 U.S. treasuries 1,995 — — 1,995 41,223 5,951 — 47,174 Marketable securities: Corporate bonds — 64,930 — 64,930 U.S. treasuries 35,894 — — 35,894 Commercial paper — 22,480 — 22,480 U.S. agency securities — 5,912 — 5,912 Certificates of deposit — 703 — 703 35,894 94,025 — 129,919 Promissory note receivable — — 1,007 1,007 Interest rate swap derivative contracts — 1,990 — 1,990 Total assets $ 77,117 $ 101,966 $ 1,007 $ 180,090 Liabilities: Foreign exchange derivative contracts $ — $ (1,146) $ — $ (1,146) December 25, 2021 Level 1 Level 2 Level 3 Total Assets: Cash equivalents: Money market funds $ 9,526 $ — $ — $ 9,526 U.S. agency securities — 5,556 — 5,556 U.S. treasuries 2,500 — — 2,500 Commercial paper — 1,000 — 1,000 12,026 6,556 — 18,582 Marketable securities: Corporate bonds — 52,709 — 52,709 U.S. treasuries 38,985 — — 38,985 Commercial paper — 32,162 — 32,162 Certificates of deposit — 1,199 — 1,199 38,985 86,070 — 125,055 Interest rate swap derivative contracts — 629 — 629 Total assets $ 51,011 $ 93,255 $ — $ 144,266 Liabilities: Foreign exchange derivative contracts $ — $ (489) $ — $ (489) Interest rate swap derivative contracts — (55) — (55) Total liabilities $ — $ (544) $ — $ (544)
Schedule of Foreign Currency Forward Contracts	The following table provides information about our foreign currency forward contracts outstanding as of June 25, 2022 (in thousands): Currency Contract Position Contract Amount Contract Amount Euro Dollar Buy (21,445) $ (24,117) Japanese Yen Sell 2,247,411 16,633 Korean Won Buy (1,010,988) (779) Taiwan Dollar Sell 28,890 974 Total USD notional amount of outstanding foreign exchange contracts $ (7,289)

Warranty (Tables)

Warranty (Tables)	6 Months Ended
	Jun. 25, 2022
Product Warranties Disclosures [Abstract]
Schedule of Reconciliation of Changes in Warranty Liability	Changes in our warranty liability were as follows (in thousands): Six Months Ended June 25, June 26, Balance at beginning of period $ 2,805 $ 3,918 Accruals 3,846 3,472 Settlements (2,673) (3,132) Balance at end of period $ 3,978 $ 4,258

Property, Plant, and Equipmen_2

Property, Plant, and Equipment, net (Tables)	6 Months Ended
	Jun. 25, 2022
Property, Plant and Equipment [Abstract]
Schedule of Property, Plant and Equipment	Property, plant and equipment, net consisted of the following (in thousands): June 25, December 25, Land $ 4,751 $ 4,751 Building and building improvements 44,429 41,722 Machinery and equipment 263,851 252,632 Computer equipment and software 45,727 44,667 Furniture and fixtures 7,434 7,293 Leasehold improvements 83,127 82,266 Sub-total 449,319 433,331 Less: Accumulated depreciation and amortization (323,779) (312,700) Net, property, plant and equipment 125,540 120,631 Construction-in-process 32,274 25,924 Total $ 157,814 $ 146,555

Stockholders_ Equity and Stoc_2

Stockholders’ Equity and Stock-Based Compensation (Tables)	6 Months Ended
	Jun. 25, 2022
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 25, 2021 2,166,934 $ 28.63 Awards granted 63,697 41.25 Awards vested (338,825) 16.73 Awards forfeited (51,941) 30.23 RSUs at June 25, 2022 1,839,865 31.22
Schedule of ESPP Activity	Information related to activity under our Employee Stock Purchase Plan (“ESPP”) was as follows: Six Months Ended June 25, 2022 Shares issued 157,642 Weighted average per share purchase price $ 35.81 Weighted average per share discount from the fair value of our common stock on the date of issuance $ (6.93)
Schedule of Stock-based Compensation	Stock-based compensation was included in our Condensed Consolidated Statements of Income as follows (in thousands): Three Months Ended Six Months Ended June 25, June 26, June 25, June 26, Cost of revenues $ 734 $ 1,079 $ 1,812 $ 2,414 Research and development 1,695 1,663 3,681 3,352 Selling, general and administrative 3,929 3,846 8,385 7,899 Total stock-based compensation $ 6,358 $ 6,588 $ 13,878 $ 13,665
Schedule of Unrecognized Stock-based Compensation	At June 25, 2022, the unrecognized stock-based compensation was as follows (dollars in thousands): Unrecognized Expense Average Expected Recognition Period in Years Restricted stock units $ 27,430 1.80 Performance restricted stock units 7,202 1.74 Employee stock purchase plan 285 0.61 Total unrecognized stock-based compensation expense $ 34,917 1.77

Net Income per Share (Tables)

Net Income per Share (Tables)	6 Months Ended
	Jun. 25, 2022
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 Six Months Ended June 25, June 26, June 25, June 26, Weighted-average shares used in computing basic net income per share 77,897 77,463 78,071 77,530 Add potentially dilutive securities 1,313 2,003 1,352 2,091 Weighted-average shares used in computing diluted net income per share 79,210 79,466 79,423 79,621 Securities not included as they would have been antidilutive 23 128 — 118

Leases (Tables)

Leases (Tables)	6 Months Ended
	Jun. 25, 2022
Leases [Abstract]
Schedule of Components of Lease Expense	The components of lease expense were as follows (in thousands): Three Months Ended Six Months Ended June 25, June 26, June 25, June 26, Lease expense: Operating lease expense $ 2,183 $ 2,048 $ 4,404 $ 4,171 Short-term lease expense 76 45 116 82 Variable lease expense 677 426 1,135 963 $ 2,936 $ 2,519 $ 5,655 $ 5,216
Schedule of Future Minimum Payments Under Leases	Future minimum payments under our non-cancelable operating leases were as follows as of June 25, 2022 (in thousands): Fiscal Year Amount Remainder of 2022 $ 4,319 2023 7,564 2024 7,224 2025 7,187 2026 6,505 Thereafter 9,143 Total minimum lease payments 41,942 Less: interest (4,588) Present value of net minimum lease payments 37,354 Less: current portion (7,843) Total long-term operating lease liabilities $ 29,511

Operating Segments and Enterp_2

Operating Segments and Enterprise-Wide Information (Tables)	6 Months Ended
	Jun. 25, 2022
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 June 25, 2022 June 26, 2021 Probe Cards Systems Corporate and Other Total Probe Cards Systems Corporate and Other Total Revenues $ 167,708 $ 36,199 $ — $ 203,907 $ 153,641 $ 34,435 $ — $ 188,076 Gross profit 78,420 18,276 (2,327) 94,369 66,600 16,907 (7,224) 76,283 Gross margin 46.8 % 50.5 % 46.3 % 43.3 % 49.1 % 40.6 % Six Months Ended June 25, 2022 June 26, 2021 Probe Cards Systems Corporate and Other Total Probe Cards Systems Corporate and Other Total Revenues $ 327,691 $ 73,390 $ — $ 401,081 $ 312,539 $ 62,173 $ — $ 374,712 Gross profit $ 155,622 $ 37,683 $ (4,712) $ 188,593 $ 136,915 $ 30,506 $ (14,432) $ 152,989 Gross margin 47.5 % 51.3 % 47.0 % 43.8 % 49.1 % 40.8 %
Schedule of Disaggregation of Revenue by Segment	Certain revenue category information by reportable segment was as follows (in thousands): Three Months Ended June 25, 2022 June 26, 2021 Probe Cards Systems Total Probe Cards Systems Total Market: Foundry & Logic $ 122,380 $ — $ 122,380 $ 103,726 $ — $ 103,726 DRAM 36,843 — 36,843 42,088 — 42,088 Flash 8,485 — 8,485 7,827 — 7,827 Systems — 36,199 36,199 — 34,435 34,435 Total $ 167,708 $ 36,199 $ 203,907 $ 153,641 $ 34,435 $ 188,076 Timing of revenue recognition: Products transferred at a point in time $ 166,701 $ 33,081 $ 199,782 $ 153,129 $ 30,884 $ 184,013 Products and services transferred over time 1,007 3,118 4,125 512 3,551 4,063 Total $ 167,708 $ 36,199 $ 203,907 $ 153,641 $ 34,435 $ 188,076 Geographical region: Taiwan $ 45,188 $ 4,832 $ 50,020 $ 46,737 $ 5,147 $ 51,884 China 40,578 9,157 49,735 23,996 7,831 31,827 United States 21,539 9,703 31,242 24,174 8,476 32,650 South Korea 27,418 1,337 28,755 35,426 751 36,177 Malaysia 16,157 87 16,244 3,034 161 3,195 Japan 6,716 3,221 9,937 3,477 4,227 7,704 Europe 3,824 4,267 8,091 6,466 5,544 12,010 Singapore 5,131 1,977 7,108 8,602 1,360 9,962 Rest of the world 1,157 1,618 2,775 1,729 938 2,667 Total $ 167,708 $ 36,199 $ 203,907 $ 153,641 $ 34,435 $ 188,076 Six Months Ended June 25, 2022 June 26, 2021 Probe Cards Systems Total Probe Cards Systems Total Market: Foundry & Logic $ 236,501 $ — $ 236,501 $ 217,136 $ — $ 217,136 DRAM 71,280 — 71,280 75,986 — 75,986 Flash 19,910 — 19,910 19,417 — 19,417 Systems — 73,390 73,390 — 62,173 62,173 Total $ 327,691 $ 73,390 $ 401,081 $ 312,539 $ 62,173 $ 374,712 Timing of revenue recognition: Products transferred at a point in time $ 325,537 $ 68,497 $ 394,034 $ 311,605 $ 55,555 $ 367,160 Products and services transferred over time 2,154 4,893 7,047 934 6,618 7,552 Total $ 327,691 $ 73,390 $ 401,081 $ 312,539 $ 62,173 $ 374,712 Geographical region: Taiwan $ 87,710 $ 15,379 $ 103,089 $ 91,471 $ 5,993 $ 97,464 China 73,369 14,765 88,134 61,827 12,625 74,452 United States 41,515 15,374 56,889 45,482 16,654 62,136 South Korea 52,299 3,957 56,256 53,427 1,835 55,262 Malaysia 37,674 769 38,443 22,922 203 23,125 Japan 11,501 7,818 19,319 8,726 8,299 17,025 Singapore 15,415 2,589 18,004 16,229 2,291 18,520 Europe 6,206 10,280 16,486 9,299 12,710 22,009 Rest of the world 2,002 2,459 4,461 3,156 1,563 4,719 Total $ 327,691 $ 73,390 $ 401,081 $ 312,539 $ 62,173 $ 374,712

Concentration of Credit and O_3

Concentration of Credit and Other Risks (Details) - Customer Concentration Risk	3 Months Ended		6 Months Ended		9 Months Ended
	Jun. 25, 2022	Jun. 26, 2021	Jun. 25, 2022	Jun. 26, 2021	Sep. 25, 2021
Revenue Benchmark | Two Major Customers
Concentration Risk [Line Items]
Concentration risk percentage			10%	10%
Revenue from Contract with Customer Benchmark | Intel Corporation
Concentration Risk [Line Items]
Concentration risk percentage	20.90%	16.20%	20.90%	22.10%
Revenue from Contract with Customer Benchmark | Samsung Electronics., LTD.
Concentration Risk [Line Items]
Concentration risk percentage		14.70%
Revenue from Contract with Customer Benchmark | Taiwan Semiconductor Manufacturing Co., LTD.
Concentration Risk [Line Items]
Concentration risk percentage		11%		11.20%
Revenue from Contract with Customer Benchmark | Customers Representing 10% or More of Total Revenues
Concentration Risk [Line Items]
Concentration risk percentage	20.90%	41.90%	20.90%	33.30%
Accounts Receivable | Major Customer 1
Concentration Risk [Line Items]
Concentration risk percentage			20%		13.80%

Inventories, net (Details)

Inventories, net (Details) - USD ($) $ in Thousands	Jun. 25, 2022	Dec. 25, 2021
Inventory Disclosure [Abstract]
Raw materials	$ 68,247	$ 57,673
Work-in-progress	52,619	35,935
Finished goods	22,609	17,940
Inventories	$ 143,475	$ 111,548

Acquisitions - Additional Infor

Acquisitions - Additional Information (Details) $ in Thousands	Jun. 09, 2022 USD ($)
Woburn
Business Acquisition [Line Items]
Consideration transferred	$ 3,121

Acquisitions - Assets Acquired

Acquisitions - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Jun. 09, 2022	Jun. 25, 2022	Dec. 25, 2021	Dec. 26, 2020
Business Acquisition [Line Items]
Goodwill		$ 212,357	$ 212,299	$ 212,761
Woburn
Business Acquisition [Line Items]
Accounts receivable	$ 178
Inventories	6,064
Property, plant and equipment	479
Prepaid expenses and other current assets	117
Other assets	28
Tangible assets acquired	6,866
Deferred revenue	(5,513)
Accounts payable and accrued liabilities	(30)
Total tangible assets acquired and liabilities assumed	1,323
Goodwill	1,798
Consideration transferred	$ 3,121

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets - Goodwill (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 25, 2022	Dec. 25, 2021
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 212,299	$ 212,761
Foreign currency translation	(1,740)	(2,068)
Goodwill, ending balance	212,357	212,299
Baldwin Park
Goodwill [Roll Forward]
Goodwill, acquired during period		352
High Precision Devices, Inc.
Goodwill [Roll Forward]
Goodwill, acquired during period		1,254
Woburn
Goodwill [Roll Forward]
Goodwill, acquired during period	1,798
Probe Cards
Goodwill [Roll Forward]
Goodwill, beginning balance	178,424	178,072
Foreign currency translation	0	0
Goodwill, ending balance	178,424	178,424
Probe Cards | Baldwin Park
Goodwill [Roll Forward]
Goodwill, acquired during period		352
Probe Cards | High Precision Devices, Inc.
Goodwill [Roll Forward]
Goodwill, acquired during period		0
Probe Cards | Woburn
Goodwill [Roll Forward]
Goodwill, acquired during period	0
Systems
Goodwill [Roll Forward]
Goodwill, beginning balance	33,875	34,689
Foreign currency translation	(1,740)	(2,068)
Goodwill, ending balance	33,933	33,875
Systems | Baldwin Park
Goodwill [Roll Forward]
Goodwill, acquired during period		0
Systems | High Precision Devices, Inc.
Goodwill [Roll Forward]
Goodwill, acquired during period		$ 1,254
Systems | Woburn
Goodwill [Roll Forward]
Goodwill, acquired during period	$ 1,798

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets - Additional information (Details)	6 Months Ended
	Jun. 25, 2022 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill, impairment loss	$ 0

Goodwill and Intangible Asset_4

Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	Jun. 25, 2022	Dec. 25, 2021
Finite-Lived Intangible Assets [Line Items]
Gross	$ 229,806	$ 233,879
Accumulated Amortization	198,934	197,537
Net	30,872	36,342
Existing developed technologies
Finite-Lived Intangible Assets [Line Items]
Gross	170,627	172,259
Accumulated Amortization	149,338	148,784
Net	21,289	23,475
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross	50,827	51,270
Accumulated Amortization	41,966	39,254
Net	8,861	12,016
Trade name
Finite-Lived Intangible Assets [Line Items]
Gross	7,952	8,054
Accumulated Amortization	7,630	7,603
Net	322	451
Backlog
Finite-Lived Intangible Assets [Line Items]
Gross	0	1,896
Accumulated Amortization	0	1,896
Net	0	0
In-process research and development
Finite-Lived Intangible Assets [Line Items]
Gross	400	400
Accumulated Amortization	0	0
Net	$ 400	$ 400

Goodwill and Intangible Asset_5

Goodwill and Intangible Assets - Amortization Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 25, 2022	Jun. 26, 2021	Jun. 25, 2022	Jun. 26, 2021
Property, Plant and Equipment [Line Items]
Amortization of intangible assets	$ 2,333	$ 7,095	$ 4,702	$ 13,900
Finite-Lived Intangible Assets, Net, Amortization Expense, Rolling Maturity [Abstract]
Remainder of 2022	4,650		4,650
2023	6,968		6,968
2024	4,390		4,390
2025	4,142		4,142
2026	3,134		3,134
Thereafter	7,188		7,188
Net	30,472		30,472
Cost of revenues
Property, Plant and Equipment [Line Items]
Amortization of intangible assets	788	5,505	1,596	10,595
Selling, general and administrative
Property, Plant and Equipment [Line Items]
Amortization of intangible assets	$ 1,545	$ 1,590	$ 3,106	$ 3,305

Accrued Liabilities (Details)

Accrued Liabilities (Details) - USD ($) $ in Thousands	Jun. 25, 2022	Dec. 25, 2021
Payables and Accruals [Abstract]
Accrued compensation and benefits	$ 32,001	$ 29,706
Accrued income and other taxes	9,468	8,086
Accrued warranty	3,978	2,805
Employee stock purchase plan contributions withheld	4,789	4,693
Accrued restructuring charges	592	2,478
Other accrued expenses	4,007	3,068
Accrued liabilities	$ 54,835	$ 50,836

Restructuring Charges - Narrati

Restructuring Charges - Narrative (Details) $ in Millions	Jun. 25, 2022 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring expected cost	$ 5
Employee Severance and Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring expected cost	1.2
Contract Termination Costs
Restructuring Cost and Reserve [Line Items]
Restructuring expected cost	1.5
Inventory Impairments
Restructuring Cost and Reserve [Line Items]
Restructuring expected cost	2
Other Costs
Restructuring Cost and Reserve [Line Items]
Restructuring expected cost	0.3
Minimum
Restructuring Cost and Reserve [Line Items]
Restructuring expected cost	5
Minimum | Probe Cards
Restructuring Cost and Reserve [Line Items]
Restructuring expected cost	2.5
Minimum | Employee Severance and Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring expected cost	1
Minimum | Contract Termination Costs
Restructuring Cost and Reserve [Line Items]
Restructuring expected cost	1.5
Minimum | Inventory Impairments
Restructuring Cost and Reserve [Line Items]
Restructuring expected cost	2
Minimum | Other Costs
Restructuring Cost and Reserve [Line Items]
Restructuring expected cost	0.5
Maximum
Restructuring Cost and Reserve [Line Items]
Restructuring expected cost	8.5
Maximum | Probe Cards
Restructuring Cost and Reserve [Line Items]
Restructuring expected cost	4.5
Maximum | Employee Severance and Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring expected cost	2
Maximum | Contract Termination Costs
Restructuring Cost and Reserve [Line Items]
Restructuring expected cost	2.5
Maximum | Inventory Impairments
Restructuring Cost and Reserve [Line Items]
Restructuring expected cost	3
Maximum | Other Costs
Restructuring Cost and Reserve [Line Items]
Restructuring expected cost	$ 1

Restructuring Charges - Restruc

Restructuring Charges - Restructuring Charges (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 25, 2022	Jun. 25, 2022
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 581	$ 894
Probe Cards
Restructuring Cost and Reserve [Line Items]
Restructuring charges	227	269
Systems
Restructuring Cost and Reserve [Line Items]
Restructuring charges	354	625
Cost of revenues
Restructuring Cost and Reserve [Line Items]
Restructuring charges	454	593
Cost of revenues | Probe Cards
Restructuring Cost and Reserve [Line Items]
Restructuring charges	227	266
Cost of revenues | Systems
Restructuring Cost and Reserve [Line Items]
Restructuring charges	227	327
Research and development
Restructuring Cost and Reserve [Line Items]
Restructuring charges	53	199
Research and development | Probe Cards
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0	0
Research and development | Systems
Restructuring Cost and Reserve [Line Items]
Restructuring charges	53	199
Selling, general and administrative
Restructuring Cost and Reserve [Line Items]
Restructuring charges	74	102
Selling, general and administrative | Probe Cards
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0	3
Selling, general and administrative | Systems
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 74	$ 99

Restructuring Charges - Changes

Restructuring Charges - Changes to the Restructuring Accrual (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 25, 2022	Jun. 25, 2022
Restructuring Reserve [Roll Forward]
Accrual at beginning of period		$ 2,478
Restructuring charges	$ 581	894
Cash payments		(2,071)
Non-cash settlement		(709)
Accrual at end of period	592	592
Employee Severance and Benefits
Restructuring Reserve [Roll Forward]
Accrual at beginning of period		1,028
Restructuring charges		185
Cash payments		(621)
Non-cash settlement		0
Accrual at end of period	592	592
Inventory Impairments
Restructuring Reserve [Roll Forward]
Accrual at beginning of period		0
Restructuring charges		646
Cash payments		0
Non-cash settlement		(646)
Accrual at end of period	0	0
Contract Termination Costs
Restructuring Reserve [Roll Forward]
Accrual at beginning of period		1,450
Restructuring charges		0
Cash payments		(1,450)
Non-cash settlement		0
Accrual at end of period	$ 0	$ 0

Fair Value and Derivative Ins_3

Fair Value and Derivative Instruments - Fair Value Assets Measured on Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 25, 2022	Dec. 25, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	$ 47,174	$ 18,582
Marketable securities	129,919	125,055
Total assets	180,090	144,266
Total liabilities		(544)
Foreign exchange derivative contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liability	(1,146)
Foreign exchange derivative contracts | Designated as hedging instrument
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liability		(489)
Promissory note receivable | Designated as hedging instrument
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative contracts	1,007
Interest rate swap derivative contracts | Designated as hedging instrument
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative contracts	1,990	629
Derivative liability		(55)
Money market funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	39,228	9,526
Commercial paper
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	3,393	1,000
Marketable securities	22,480
Commercial paper | Designated as hedging instrument
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable securities		32,162
U.S. treasuries
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	1,995	2,500
Marketable securities	35,894	38,985
Certificates of deposit
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable securities	703	1,199
U.S. agency securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	2,558	5,556
Marketable securities	5,912
Corporate bonds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable securities	64,930	52,709
Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	41,223	12,026
Marketable securities	35,894	38,985
Total assets	77,117	51,011
Total liabilities		0
Level 1 | Foreign exchange derivative contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liability	0
Level 1 | Foreign exchange derivative contracts | Designated as hedging instrument
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liability		0
Level 1 | Promissory note receivable | Designated as hedging instrument
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative contracts	0
Level 1 | Interest rate swap derivative contracts | Designated as hedging instrument
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative contracts	0	0
Derivative liability		0
Level 1 | Money market funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	39,228	9,526
Level 1 | Commercial paper
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	0	0
Marketable securities	0
Level 1 | Commercial paper | Designated as hedging instrument
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable securities		0
Level 1 | U.S. treasuries
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	1,995	2,500
Marketable securities	35,894	38,985
Level 1 | Certificates of deposit
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable securities	0	0
Level 1 | U.S. agency securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	0	0
Marketable securities	0
Level 1 | Corporate bonds
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]
Cash equivalents	5,951	6,556
Marketable securities	94,025	86,070
Total assets	101,966	93,255
Total liabilities		(544)
Level 2 | Foreign exchange derivative contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liability	(1,146)
Level 2 | Foreign exchange derivative contracts | Designated as hedging instrument
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liability		(489)
Level 2 | Promissory note receivable | Designated as hedging instrument
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative contracts	0
Level 2 | Interest rate swap derivative contracts | Designated as hedging instrument
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative contracts	1,990	629
Derivative liability		(55)
Level 2 | Money market funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	0	0
Level 2 | Commercial paper
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	3,393	1,000
Marketable securities	22,480
Level 2 | Commercial paper | Designated as hedging instrument
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable securities		32,162
Level 2 | U.S. treasuries
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	0	0
Marketable securities	0	0
Level 2 | Certificates of deposit
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable securities	703	1,199
Level 2 | U.S. agency securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	2,558	5,556
Marketable securities	5,912
Level 2 | Corporate bonds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable securities	64,930	52,709
Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	0	0
Marketable securities	0	0
Total assets	1,007	0
Total liabilities		0
Level 3 | Foreign exchange derivative contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liability	0
Level 3 | Foreign exchange derivative contracts | Designated as hedging instrument
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liability		0
Level 3 | Promissory note receivable | Designated as hedging instrument
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative contracts	1,007
Level 3 | Interest rate swap derivative contracts | Designated as hedging instrument
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative contracts	0	0
Derivative liability		0
Level 3 | Money market funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	0	0
Level 3 | Commercial paper
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	0	0
Marketable securities	0
Level 3 | Commercial paper | Designated as hedging instrument
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable securities		0
Level 3 | U.S. treasuries
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	0	0
Marketable securities	0	0
Level 3 | Certificates of deposit
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable securities	0	0
Level 3 | U.S. agency securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	0	0
Marketable securities	0
Level 3 | Corporate bonds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable securities	$ 0	$ 0

Fair Value and Derivative Ins_4

Fair Value and Derivative Instruments - Foreign Currency Forward Contracts (Details) - Jun. 25, 2022 - Foreign Exchange Forward € in Thousands, ₩ in Thousands, ¥ in Thousands, $ in Thousands, $ in Thousands	EUR (€)	USD ($)	JPY (¥)	KRW (₩)	TWD ($)
Derivative [Line Items]
Derivative, notional amount		$ (7,289)
Buy | Euro Dollar
Derivative [Line Items]
Derivative, notional amount	€ (21,445)	(24,117)
Buy | Korean Won
Derivative [Line Items]
Derivative, notional amount		(779)		₩ (1,010,988)
Sell | Japanese Yen
Derivative [Line Items]
Derivative, notional amount		(16,633)	¥ (2,247,411)
Sell | Taiwan Dollar
Derivative [Line Items]
Derivative, notional amount		$ (974)			$ (28,890)

Fair Value and Derivative Ins_5

Fair Value and Derivative Instruments - Additional Information (Details) - USD ($)	Jun. 25, 2022	Dec. 25, 2021	Jun. 26, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value on non-recurring basis	$ 180,090,000	$ 144,266,000
Liabilities measured at fair value on non-recurring basis		$ 544,000
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
Liabilities measured at fair value on non-recurring basis	$ 0		$ 0

Warranty (Details)

Warranty (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 25, 2022	Jun. 26, 2021
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]
Balance at beginning of period	$ 2,805	$ 3,918
Accruals	3,846	3,472
Settlements	(2,673)	(3,132)
Balance at end of period	$ 3,978	$ 4,258

Property, Plant, and Equipmen_3

Property, Plant, and Equipment, net (Details) - USD ($) $ in Thousands	Jun. 25, 2022	Dec. 25, 2021
Property, Plant and Equipment [Line Items]
Sub-total	$ 449,319	$ 433,331
Less: Accumulated depreciation and amortization	(323,779)	(312,700)
Net, property, plant and equipment	125,540	120,631
Construction-in-process	32,274	25,924
Total	157,814	146,555
Land
Property, Plant and Equipment [Line Items]
Sub-total	4,751	4,751
Building and building improvements
Property, Plant and Equipment [Line Items]
Sub-total	44,429	41,722
Machinery and equipment
Property, Plant and Equipment [Line Items]
Sub-total	263,851	252,632
Computer equipment and software
Property, Plant and Equipment [Line Items]
Sub-total	45,727	44,667
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Sub-total	7,434	7,293
Leasehold improvements
Property, Plant and Equipment [Line Items]
Sub-total	$ 83,127	$ 82,266

Stockholders_ Equity and Stoc_3

Stockholders’ Equity and Stock-Based Compensation - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 25, 2022	Jun. 26, 2021	Jun. 25, 2022	Jun. 26, 2021	Dec. 25, 2021	May 23, 2022	Oct. 26, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Purchase of common stock value retired through repurchase program	$ 44,931,000	$ 18,213,000	$ 54,328,000	$ 23,951,000
PRSUs | Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards granted (in shares)			0
Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase program authorized amount						$ 75,000,000	$ 50,000,000
Purchase of common stock retired through repurchase program (in shares)	767,083		676,408		622,400
Purchase of common stock value retired through repurchase program	$ 28,400,000		$ 26,000,000		$ 24,000,000
Amount remaining for future repurchases	$ 46,600,000		$ 46,600,000

Stockholders_ Equity and Stoc_4

Stockholders’ Equity and Stock-Based Compensation - Restricted Stock Unit Activity (Details) - Equity Incentive Plan - Restricted Stock Units	6 Months Ended
	Jun. 25, 2022 $ / shares shares
Units
Beginning balance (in shares) | shares	2,166,934
Awards granted (in shares) | shares	63,697
Awards vested (in shares) | shares	(338,825)
Awards canceled (in shares) | shares	(51,941)
Ending balance (in shares) | shares	1,839,865
Weighted Average Grant Date Fair Value
Beginning balance (in dollars per share) | $ / shares	$ 28.63
Awards granted (in dollars per share) | $ / shares	41.25
Awards vested (in dollars per share) | $ / shares	16.73
Awards canceled (in dollars per share) | $ / shares	30.23
Ending balance (in dollars per share) | $ / shares	$ 31.22

Stockholders_ Equity and Stoc_5

Stockholders’ Equity and Stock-Based Compensation - ESPP Activity (Details) - Employee stock purchase plan	6 Months Ended
	Jun. 25, 2022 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued (in shares) | shares	157,642
Weighted average per share purchase price (in dollars per share)	$ 35.81
Weighted average per share discount from the fair value of our common stock on the date of issuance (in dollars per share)	$ (6.93)

Stockholders_ Equity and Stoc_6

Stockholders’ Equity and Stock-Based Compensation - Stock-Based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 25, 2022	Jun. 26, 2021	Jun. 25, 2022	Jun. 26, 2021
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation	$ 6,358	$ 6,588	$ 13,878	$ 13,665
Cost of revenues
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation	734	1,079	1,812	2,414
Research and development
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation	1,695	1,663	3,681	3,352
Selling, general and administrative
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation	$ 3,929	$ 3,846	$ 8,385	$ 7,899

Stockholders_ Equity and Stoc_7

Stockholders’ Equity and Stock-Based Compensation - Unrecognized Compensation Costs (Details) $ in Thousands	6 Months Ended
	Jun. 25, 2022 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Expense	$ 34,917
Average Expected Recognition Period in Years	1 year 9 months 7 days
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Expense	$ 27,430
Average Expected Recognition Period in Years	1 year 9 months 18 days
Performance restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Expense	$ 7,202
Average Expected Recognition Period in Years	1 year 8 months 26 days
Employee stock purchase plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Expense	$ 285
Average Expected Recognition Period in Years	7 months 9 days

Net Income per Share (Details)

Net Income per Share (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 25, 2022	Jun. 26, 2021	Jun. 25, 2022	Jun. 26, 2021
Earnings Per Share [Abstract]
Weighted-average shares used in computing basic net income per share (in shares)	77,897	77,463	78,071	77,530
Add potentially dilutive securities (in shares)	1,313	2,003	1,352	2,091
Weighted-average shares used in computing diluted net income per share (in shares)	79,210	79,466	79,423	79,621
Securities not included as they would have been antidilutive (in shares)	23	128	0	118

Leases - Narrative (Details)

Leases - Narrative (Details)	Jun. 25, 2022
Lessee, Lease, Description [Line Items]
Operating lease, renewal term	20 years
Operating lease, weighted average remaining lease term	6 years
Operating lease, weighted average discount rate	3.69%
Minimum
Lessee, Lease, Description [Line Items]
Operating lease, term of contract	1 year
Maximum
Lessee, Lease, Description [Line Items]
Operating lease, term of contract	7 years
Automobiles | Minimum
Lessee, Lease, Description [Line Items]
Operating lease, term of contract	1 year
Automobiles | Maximum
Lessee, Lease, Description [Line Items]
Operating lease, term of contract	3 years

Leases - Components of Lease Ex

Leases - Components of Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 25, 2022	Jun. 26, 2021	Jun. 25, 2022	Jun. 26, 2021
Leases [Abstract]
Operating lease expense	$ 2,183	$ 2,048	$ 4,404	$ 4,171
Short-term lease expense	76	45	116	82
Variable lease expense	677	426	1,135	963
Total lease expense	$ 2,936	$ 2,519	$ 5,655	$ 5,216

Leases - Schedule of Future Min

Leases - Schedule of Future Minimum Payments Under Leases (Details) - USD ($) $ in Thousands	Jun. 25, 2022	Dec. 25, 2021
Leases [Abstract]
Remainder of 2022	$ 4,319
2023	7,564
2024	7,224
2025	7,187
2026	6,505
Thereafter	9,143
Total minimum lease payments	41,942
Less: interest	(4,588)
Present value of net minimum lease payments	37,354
Less: current portion	(7,843)	$ (7,901)
Total long-term operating lease liabilities	$ 29,511	$ 31,009

Revenue - Additional Informatio

Revenue - Additional Information (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 25, 2022	Dec. 25, 2021
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Performance obligations	$ 9.7
Contract assets	2	$ 0.9
Contract with customer, liability	32.2	$ 24.2
Revenue recognized included in contracts	$ 16.5
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-06-26
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, percentage	66.90%
Revenue, remaining performance obligation, expected timing of satisfaction, period	6 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, percentage	27.70%
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-12-31
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, percentage	5.40%
Revenue, remaining performance obligation, expected timing of satisfaction, period

Operating Segments and Enterp_3

Operating Segments and Enterprise-Wide Information - Additional Information (Details)	6 Months Ended
	Jun. 25, 2022 segment
Segment Reporting [Abstract]
Number of reportable segments	2

Operating Segments and Enterp_4

Operating Segments and Enterprise-Wide Information - Operating Results by Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 25, 2022	Jun. 26, 2021	Jun. 25, 2022	Jun. 26, 2021
Segment Reporting Information [Line Items]
Revenues	$ 203,907	$ 188,076	$ 401,081	$ 374,712
Gross profit	$ 94,369	$ 76,283	$ 188,593	$ 152,989
Gross margin	46.30%	40.60%	47%	40.80%
Probe Cards
Segment Reporting Information [Line Items]
Revenues	$ 167,708	$ 153,641	$ 327,691	$ 312,539
Systems
Segment Reporting Information [Line Items]
Revenues	36,199	34,435	73,390	62,173
Operating segments | Probe Cards
Segment Reporting Information [Line Items]
Revenues	167,708	153,641	327,691	312,539
Gross profit	$ 78,420	$ 66,600	$ 155,622	$ 136,915
Gross margin	46.80%	43.30%	47.50%	43.80%
Operating segments | Systems
Segment Reporting Information [Line Items]
Revenues	$ 36,199	$ 34,435	$ 73,390	$ 62,173
Gross profit	$ 18,276	$ 16,907	$ 37,683	$ 30,506
Gross margin	50.50%	49.10%	51.30%	49.10%
Operating segments | Corporate and Other
Segment Reporting Information [Line Items]
Revenues	$ 0	$ 0	$ 0	$ 0
Gross profit	$ (2,327)	$ (7,224)	$ (4,712)	$ (14,432)
Gross margin

Operating Segments and Enterp_5

Operating Segments and Enterprise-Wide Information - Revenue by Segment, Recognition Type, and Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 25, 2022	Jun. 26, 2021	Jun. 25, 2022	Jun. 26, 2021
Disaggregation of Revenue [Line Items]
Revenues	$ 203,907	$ 188,076	$ 401,081	$ 374,712
Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	167,708	153,641	327,691	312,539
Systems
Disaggregation of Revenue [Line Items]
Revenues	36,199	34,435	73,390	62,173
Taiwan
Disaggregation of Revenue [Line Items]
Revenues	50,020	51,884	103,089	97,464
Taiwan | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	45,188	46,737	87,710	91,471
Taiwan | Systems
Disaggregation of Revenue [Line Items]
Revenues	4,832	5,147	15,379	5,993
China
Disaggregation of Revenue [Line Items]
Revenues	49,735	31,827	88,134	74,452
China | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	40,578	23,996	73,369	61,827
China | Systems
Disaggregation of Revenue [Line Items]
Revenues	9,157	7,831	14,765	12,625
United States
Disaggregation of Revenue [Line Items]
Revenues	31,242	32,650	56,889	62,136
United States | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	21,539	24,174	41,515	45,482
United States | Systems
Disaggregation of Revenue [Line Items]
Revenues	9,703	8,476	15,374	16,654
South Korea
Disaggregation of Revenue [Line Items]
Revenues	28,755	36,177	56,256	55,262
South Korea | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	27,418	35,426	52,299	53,427
South Korea | Systems
Disaggregation of Revenue [Line Items]
Revenues	1,337	751	3,957	1,835
Malaysia
Disaggregation of Revenue [Line Items]
Revenues	16,244	3,195	38,443	23,125
Malaysia | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	16,157	3,034	37,674	22,922
Malaysia | Systems
Disaggregation of Revenue [Line Items]
Revenues	87	161	769	203
Japan
Disaggregation of Revenue [Line Items]
Revenues	9,937	7,704	19,319	17,025
Japan | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	6,716	3,477	11,501	8,726
Japan | Systems
Disaggregation of Revenue [Line Items]
Revenues	3,221	4,227	7,818	8,299
Singapore
Disaggregation of Revenue [Line Items]
Revenues	7,108	9,962	18,004	18,520
Singapore | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	5,131	8,602	15,415	16,229
Singapore | Systems
Disaggregation of Revenue [Line Items]
Revenues	1,977	1,360	2,589	2,291
Europe
Disaggregation of Revenue [Line Items]
Revenues	8,091	12,010	16,486	22,009
Europe | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	3,824	6,466	6,206	9,299
Europe | Systems
Disaggregation of Revenue [Line Items]
Revenues	4,267	5,544	10,280	12,710
Rest of the world
Disaggregation of Revenue [Line Items]
Revenues	2,775	2,667	4,461	4,719
Rest of the world | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	1,157	1,729	2,002	3,156
Rest of the world | Systems
Disaggregation of Revenue [Line Items]
Revenues	1,618	938	2,459	1,563
Products transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenues	199,782	184,013	394,034	367,160
Products transferred at a point in time | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	166,701	153,129	325,537	311,605
Products transferred at a point in time | Systems
Disaggregation of Revenue [Line Items]
Revenues	33,081	30,884	68,497	55,555
Products and services transferred over time
Disaggregation of Revenue [Line Items]
Revenues	4,125	4,063	7,047	7,552
Products and services transferred over time | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	1,007	512	2,154	934
Products and services transferred over time | Systems
Disaggregation of Revenue [Line Items]
Revenues	3,118	3,551	4,893	6,618
Foundry & Logic
Disaggregation of Revenue [Line Items]
Revenues	122,380	103,726	236,501	217,136
Foundry & Logic | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	122,380	103,726	236,501	217,136
Foundry & Logic | Systems
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
DRAM
Disaggregation of Revenue [Line Items]
Revenues	36,843	42,088	71,280	75,986
DRAM | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	36,843	42,088	71,280	75,986
DRAM | Systems
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Flash
Disaggregation of Revenue [Line Items]
Revenues	8,485	7,827	19,910	19,417
Flash | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	8,485	7,827	19,910	19,417
Flash | Systems
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Systems
Disaggregation of Revenue [Line Items]
Revenues	36,199	34,435	73,390	62,173
Systems | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Systems | Systems
Disaggregation of Revenue [Line Items]
Revenues	$ 36,199	$ 34,435	$ 73,390	$ 62,173