Infinera (INFN) 10-Q 29 Feb 24 2023 Q3 Quarterly report Financial data

Cover Page

Cover Page - shares	9 Months Ended
	Sep. 30, 2023	Feb. 23, 2024
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2023
Document Transition Report	false
Entity File Number	001-33486
Entity Registrant Name	INFINERA CORPORATION
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	77-0560433
Entity Address, Address Line One	6373 San Ignacio Avenue
Entity Address, City or Town	San Jose
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	95119
City Area Code	408
Local Phone Number	572-5200
Title of 12(b) Security	Common stock, par value $0.001 per share
Trading Symbol	INFN
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 (in shares)		231,422,390
Amendment Flag	false
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q3
Entity Central Index Key	0001138639
Current Fiscal Year End Date	--12-30

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 123,927	$ 178,657
Short-term restricted cash	1,725	7,274
Accounts receivable, net	328,863	419,735
Inventory	456,880	374,855
Prepaid expenses and other current assets	127,145	152,451
Total current assets	1,038,540	1,132,972
Property, plant and equipment, net	200,718	172,929
Operating lease right-of-use assets	29,877	34,543
Intangible assets, net	27,075	47,787
Goodwill	225,219	232,663
Long-term restricted cash	984	3,272
Other long-term assets	45,912	44,972
Total assets	1,568,325	1,669,138
Current liabilities:
Accounts payable	282,122	304,880
Accrued expenses and other current liabilities	110,288	141,450
Accrued compensation and related benefits	77,160	78,849
Short-term debt, net	25,641	510
Accrued warranty	18,845	19,747
Deferred revenue	100,777	158,501
Total current liabilities	614,833	703,937
Long-term debt, net	657,936	667,719
Long-term accrued warranty	17,013	16,874
Long-term deferred revenue	21,173	23,178
Long-term deferred tax liability	2,234	2,348
Long-term operating lease liabilities	39,158	45,862
Other long-term liabilities	34,749	29,573
Commitments and contingencies (Note 11)
Stockholders’ equity:
Preferred stock, $0.001 par value Authorized shares – 25,000 and no shares issued and outstanding	0	0
Common stock, $0.001 par value Authorized shares – 500,000 as of September 30, 2023 and December 31, 2022 Issued and outstanding shares – 229,442 as of September 30, 2023 and 220,408 as of December 31, 2022	229	220
Additional paid-in capital	1,963,838	1,901,491
Accumulated other comprehensive loss	(45,159)	(22,471)
Accumulated deficit	(1,737,679)	(1,699,593)
Total stockholders' equity	181,229	179,647
Total liabilities and stockholders’ equity	$ 1,568,325	$ 1,669,138

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Sep. 30, 2023	Dec. 31, 2022
Statement of Financial Position [Abstract]
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	25,000,000	25,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, authorized shares (in shares)	500,000,000	500,000,000
Common stock, shares issued (in shares)	229,442,000	220,408,000
Common stock, shares outstanding (in shares)	229,442,000	220,408,000

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 24, 2022	Sep. 30, 2023	Sep. 24, 2022
Revenue:
Total revenue	$ 392,369	$ 390,447	$ 1,160,672	$ 1,087,306
Cost of revenue:
Amortization of intangible assets	3,528	6,227	10,621	18,687
Restructuring and other related costs	0	22	0	185
Total cost of revenue	234,049	256,032	712,662	732,044
Gross profit	158,320	134,415	448,010	355,262
Operating expenses:
Research and development	76,846	76,156	237,234	228,202
Sales and marketing	41,075	33,919	124,406	105,072
General and administrative	29,368	28,923	89,762	86,963
Amortization of intangible assets	2,976	3,582	10,088	10,995
Restructuring and other related costs	400	1,142	2,621	9,545
Total operating expenses	150,665	143,722	464,111	440,777
Income (loss) from operations	7,655	(9,307)	(16,101)	(85,515)
Other (expense) income, net:
Interest income	546	269	1,734	426
Interest expense	(7,608)	(6,516)	(21,795)	(18,760)
Gain on extinguishment of debt	0	15,521	0	15,521
Other (loss) gain, net	(7,540)	(7,105)	10,586	(4,605)
Total other (expense) income, net	(14,602)	2,169	(9,475)	(7,418)
Loss before income taxes	(6,947)	(7,138)	(25,576)	(92,933)
Provision for income taxes	2,466	4,792	12,510	16,568
Net loss	$ (9,413)	$ (11,930)	$ (38,086)	$ (109,501)
Net loss per common share:
Basic (in dollars per share)	$ (0.04)	$ (0.05)	$ (0.17)	$ (0.51)
Diluted (in dollars per share)	$ (0.04)	$ (0.05)	$ (0.17)	$ (0.51)
Weighted average shares used in computing net loss per common share:
Basic (in shares)	228,077	217,620	225,465	215,104
Diluted (in shares)	228,077	217,620	225,465	215,104
Product
Revenue:
Total revenue	$ 316,613	$ 317,439	$ 931,057	$ 869,744
Cost of revenue:
Cost of revenue	190,312	210,018	577,152	597,027
Services
Revenue:
Total revenue	75,756	73,008	229,615	217,562
Cost of revenue:
Cost of revenue	$ 40,209	$ 39,765	$ 124,889	$ 116,145

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 24, 2022	Sep. 30, 2023	Sep. 24, 2022
Statement of Comprehensive Income [Abstract]
Net loss	$ (9,413)	$ (11,930)	$ (38,086)	$ (109,501)
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustment	2,208	(9,673)	(21,936)	(34,883)
Actuarial loss on pension liabilities	0	0	(447)	0
Amortization of actuarial (gain) loss	(108)	77	(305)	246
Net change in accumulated other comprehensive loss	2,100	(9,596)	(22,688)	(34,637)
Comprehensive loss	$ (7,313)	$ (21,526)	$ (60,774)	$ (144,138)

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Additional Paid-in Capital	Additional Paid-in Capital Cumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive Loss	Accumulated Deficit	Accumulated Deficit Cumulative Effect, Period of Adoption, Adjustment
Beginning balance (in shares) at Dec. 25, 2021			211,381
Beginning balance at Dec. 25, 2021	$ 323,771	$ (122,001)	$ 211	$ 2,026,098	$ (196,493)	$ (4,496)	$ (1,698,042)	$ 74,492
Increase (Decrease) in Stockholders' Equity [Roll Forward]
ESPP shares issued (in shares)			2,552
ESPP shares issued	15,191		$ 2	15,189
Restricted stock units released (in shares)			5,419
Restricted stock units released	6		$ 6
Shares withheld for tax obligations (in shares)			(489)
Shares withheld for tax obligations	(3,346)			(3,346)
Stock-based compensation	44,718			44,718
Other comprehensive loss	(34,637)					(34,637)
Net loss	(109,501)						(109,501)
Ending balance (in shares) at Sep. 24, 2022			218,863
Ending balance at Sep. 24, 2022	114,201		$ 219	1,886,166		(39,133)	(1,733,051)
Beginning balance (in shares) at Jun. 25, 2022			216,431
Beginning balance at Jun. 25, 2022	116,558		$ 216	1,867,000		(29,537)	(1,721,121)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
ESPP shares issued (in shares)			1,318
ESPP shares issued	6,310		$ 1	6,309
Restricted stock units released (in shares)			1,324
Restricted stock units released	2		$ 2
Shares withheld for tax obligations (in shares)			(210)
Shares withheld for tax obligations	(957)			(957)
Stock-based compensation	13,814			13,814
Other comprehensive loss	(9,596)					(9,596)
Net loss	(11,930)						(11,930)
Ending balance (in shares) at Sep. 24, 2022			218,863
Ending balance at Sep. 24, 2022	114,201		$ 219	1,886,166		(39,133)	(1,733,051)
Beginning balance (in shares) at Dec. 31, 2022			220,408
Beginning balance at Dec. 31, 2022	179,647		$ 220	1,901,491		(22,471)	(1,699,593)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
ESPP shares issued (in shares)			3,514
ESPP shares issued	14,931		$ 4	14,927
Restricted stock units released (in shares)			5,883
Restricted stock units released	5		$ 5
Shares withheld for tax obligations (in shares)			(363)
Shares withheld for tax obligations	(2,217)			(2,217)
Stock-based compensation	49,637			49,637
Other comprehensive loss	(22,688)					(22,688)
Net loss	(38,086)						(38,086)
Ending balance (in shares) at Sep. 30, 2023			229,442
Ending balance at Sep. 30, 2023	181,229		$ 229	1,963,838		(45,159)	(1,737,679)
Beginning balance (in shares) at Jul. 01, 2023			226,488
Beginning balance at Jul. 01, 2023	167,178		$ 226	1,942,477		(47,259)	(1,728,266)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
ESPP shares issued (in shares)			1,739
ESPP shares issued	6,195		$ 2	6,193
Restricted stock units released (in shares)			1,338
Restricted stock units released	1		$ 1
Shares withheld for tax obligations (in shares)			(123)
Shares withheld for tax obligations	(549)			(549)
Stock-based compensation	15,717			15,717
Other comprehensive loss	2,100					2,100
Net loss	(9,413)						(9,413)
Ending balance (in shares) at Sep. 30, 2023			229,442
Ending balance at Sep. 30, 2023	$ 181,229		$ 229	$ 1,963,838		$ (45,159)	$ (1,737,679)

CONDENSED CONSOLIDATED STATEM_4

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2023	Sep. 24, 2022
Cash Flows from Operating Activities:
Net loss		$ (38,086)	$ (109,501)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:
Depreciation and amortization		59,403	64,011
Non-cash restructuring charges and other related costs		1,183	6,098
Amortization of debt issuance costs and discount		2,970	5,270
Operating lease expense		6,402	7,203
Stock-based compensation expense		49,393	44,418
Gain on extinguishment of debt		0	(15,521)
Other, net		(683)	892
Changes in assets and liabilities:
Accounts receivable		89,248	64,833
Inventory		(82,983)	(45,514)
Prepaid expenses and other current assets		16,811	(36,971)
Accounts payable		(27,798)	37,327
Accrued expenses and other current liabilities		(46,163)	(23,083)
Deferred revenue		(59,839)	(36,458)
Net cash used in operating activities		(30,142)	(36,996)
Cash Flows from Investing Activities:
Purchase of property and equipment		(40,900)	(37,750)
Net cash used in investing activities		(40,900)	(37,750)
Cash Flows from Financing Activities:
Proceeds from issuance of 2028 Notes, net of discount		98,751	373,750
Repayment of 2024 Notes		(83,446)	(280,842)
Proceeds from asset-based revolving credit facility		0	80,000
Repayment of asset-based revolving credit facility		0	(80,000)
Repayment of mortgage payable		(381)	(366)
Payment of debt issuance cost		(2,108)	(11,246)
Payment of term license obligation		(7,720)	(5,413)
Principal payments on finance lease obligations		(784)	(1,054)
Proceeds from issuance of common stock		14,931	15,189
Tax withholding paid on behalf of employees for net share settlement		(2,217)	(3,346)
Net cash provided by financing activities		17,026	86,672
Effect of exchange rate changes on cash		(8,551)	(4,430)
Net change in cash, cash equivalents and restricted cash		(62,567)	7,496
Cash, cash equivalents and restricted cash at beginning of period		189,203	202,521
Cash, cash equivalents, and restricted cash at end of period	[1]	126,636	210,017
Supplemental disclosures of cash flow information:
Cash paid for income taxes, net		9,955	9,330
Cash paid for interest		21,579	14,694
Supplemental schedule of non-cash investing and financing activities:
Unpaid debt issuance cost		0	1,313
Property and equipment included in accounts payable and accrued liabilities		18,529	2,698
Transfer of inventory to fixed assets		1,207	4,805
Unpaid term licenses (included in accounts payable, accrued liabilities and other long-term liabilities)		$ 16,510	$ 8,591
[1]Reconciliation of cash, cash equivalents and restricted cash to the condensed consolidated balance sheets: September 30, September 24, Cash and cash equivalents $ 123,927 $ 198,044 Short-term restricted cash 1,725 8,946 Long-term restricted cash 984 3,027 Total cash, cash equivalents and restricted cash $ 126,636 $ 210,017

CONDENSED CONSOLIDATED STATEM_5

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2023		Dec. 31, 2022	Sep. 24, 2022		Dec. 25, 2021
Restricted Cash and Cash Equivalents [Abstract]
Cash and cash equivalents	$ 123,927		$ 178,657	$ 198,044
Short-term restricted cash	1,725		7,274	8,946
Long-term restricted cash	984		3,272	3,027
Total cash, cash equivalents and restricted cash	$ 126,636	[1]	$ 189,203	$ 210,017	[1]	$ 202,521
[1]Reconciliation of cash, cash equivalents and restricted cash to the condensed consolidated balance sheets: September 30, September 24, Cash and cash equivalents $ 123,927 $ 198,044 Short-term restricted cash 1,725 8,946 Long-term restricted cash 984 3,027 Total cash, cash equivalents and restricted cash $ 126,636 $ 210,017

Basis of Presentation and Signi

Basis of Presentation and Significant Accounting Policies	9 Months Ended
	Sep. 30, 2023
Accounting Policies [Abstract]
Basis of Presentation and Significant Accounting Policies	Basis of Presentation and Significant Accounting Policies Infinera Corporation (the “Company”) prepared its interim condensed consolidated financial statements that accompany these notes in conformity with U.S. generally accepted accounting principles (“U.S. GAAP”) and pursuant to the rules and regulations of the U.S. Securities and Exchange Commission (the “SEC”), consistent in all material respects with those applied in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2022, as amended. The Company has made certain estimates, assumptions and judgments that can affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of the condensed consolidated financial statements, as well as the reported amounts of revenue and expenses during the periods presented. Estimates, assumptions and judgments made by management include inventory valuation, revenue recognition, accounting for income taxes, stock-based compensation, employee benefit and pension plans, manufacturing partner and supplier liabilities, allowances for sales returns, allowances for credit losses, useful life of intangibles and property, plant and equipment, impairment loss related to lease abandonment, accrued warranty, operating and finance lease liabilities, restructuring and other related costs and loss contingencies. Management believes that the estimates and judgments upon which they rely are reasonable based upon information available to them at the time that these estimates and judgments are made. The Company expects uncertainties around its key accounting estimates to continue to evolve depending on the duration and degree of impact associated with inflation, disruption in the global economy and financial markets and the ongoing effects of the coronavirus (“COVID-19”) pandemic. These estimates may change as new events occur and additional information emerges, and such changes are recognized or disclosed in the Company's condensed consolidated financial statements. The interim financial information is unaudited, but reflects all adjustments that are, in management’s opinion, necessary to provide a fair presentation of results for the interim periods presented. All adjustments are of a normal recurring nature. The condensed consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All intercompany balances and transactions have been eliminated. This interim information should be read in conjunction with the consolidated financial statements in the Annual Report on Form 10-K for the fiscal year ended December 31, 2022, as amended. For the three-months ended September 30, 2023, one customer accounted for 12% of the Company's total revenue and for the nine-months ended September 30, 2023, the same customer accounted for 11% of the Company's total revenue. For the three-months ended September 24, 2022, one customer accounted for 12% of the Company's total revenue and for the nine-months ended September 24, 2022, no customer accounted for 10% or more of the Company's total revenue. There have been no material changes in the Company’s significant accounting policies for the nine- months ended September 30, 2023 compare d to those disclosed in the Annual Report on Form 10-K for the fiscal year ended December 31, 2022, as amended. Accounting Pronouncements Not Yet Adopted Segment Reporting Disclosures In November 2023, the FASB issued ASU 2023-07, “Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures.” The standard improves reportable segment disclosure requirements for public business entities primarily through enhanced disclosures about significant segment expenses that are regularly provided to the chief operating decision maker (“CODM”) and included within each reported measure of segment profit (referred to as the “significant expense principle”). The standard will become effective for fiscal year 2024 annual financial statements and interim financial statements thereafter and will be applied retrospectively for all prior periods presented in the financial statements, with early adoption permitted. The Company plans to adopt the standard when it becomes effective beginning in fiscal year 2024 annual financial statements, and is currently evaluating the impact this guidance will have on the disclosures included in the Notes to the Consolidated Financial Statements. Income Tax Disclosures In December 2023, the FASB issued ASU 2023-09, “Income Taxes (Topic 740): Improvements to Income Tax Disclosures.” The standard enhances income tax disclosure requirements for all entities by requiring specified categories and greater disaggregation within the rate reconciliation table, disclosure of income taxes paid by jurisdiction, and providing clarification on uncertain tax positions and related financial statement impacts. The standard will be effective for fiscal year 2024 annual financial statements with early adoption permitted. The Company plans to adopt the standard when it becomes effective beginning in fiscal year 2024 annual financial statements, and expects the adoption of the standard will impact certain of the income tax disclosures.

Leases

Leases	9 Months Ended
	Sep. 30, 2023
Leases [Abstract]
Leases	Leases The Company has operating leases for real estate (facilities) and automobiles. For the three- and nine-months ended September 30, 2023, operating lease expense was $3.4 million and $11.6 million, respectively. Included in operating lease expense were rent expense and impairment charges due to restructuring resulting in abandonment of certain lease facilities, amounting to $0.4 million and $2.6 million, for the three- and nine-months ended September 30, 2023, respectively. For the three- and nine-months ended September 24, 2022, operating lease expense was $4.2 million and $17.5 million, respectively. Included in operating lease expense were rent expense and impairment charges due to restructuring resulting in abandonment of certain lease facilities, amounting to $1.1 million and $7.5 million, for the three- and nine-months ended September 24, 2022, respectively. Variable lease cost, short-term lease cost and sublease income were immaterial during the three- and nine-month periods ended September 30, 2023 and September 24, 2022. The following table presents current and long-term portion of operating lease liabilities as classified in the condensed consolidated balance sheets (in thousands): September 30, December 31, Accrued expenses and other current liabilities $ 11,875 $ 10,948 Other long-term liabilities 39,158 45,862 Total operating lease liability $ 51,033 $ 56,810 The Company also has finance leases. The lease term for these arrangements range from three The following table presents maturity of lease liabilities under the Company's non-cancelable leases as of September 30, 2023 (in thousands): Operating Lease Finance Lease Total lease payments $ 62,873 $ 5,436 Less: interest (1) 11,840 781 Present value of lease liabilities $ 51,033 $ 4,655 (1) Calculated using the interest rate for each lease. The following table presents supplemental information for the Company's non-cancelable leases for the nine-months ended September 30, 2023 (in thousands, except for weighted average and percentage data): Operating Lease Finance Lease Weighted average remaining lease term 4.79 years 4.24 years Weighted average discount rate 9.32 % 9.88 % Cash paid for amounts included in the measurement of lease liabilities $ 12,261 $ 784 Leased assets obtained in exchange for new lease liabilities $ 3,104 $ 4,363

Revenue Recognition

Revenue Recognition	9 Months Ended
	Sep. 30, 2023
Revenue from Contract with Customer [Abstract]
Revenue Recognition	Revenue Recognition Disaggregation of Revenue The following table presents the Company's revenue disaggregated by geography, based on the shipping address of the customer (in thousands): Three Months Ended Nine Months Ended September 30, September 24, September 30, September 24, United States $ 229,649 $ 222,071 $ 683,798 $ 573,786 Other Americas 25,361 21,496 69,073 75,232 Europe, Middle East and Africa 99,261 94,181 278,154 306,630 Asia Pacific 38,098 52,699 129,647 131,658 Total revenue $ 392,369 $ 390,447 $ 1,160,672 $ 1,087,306 The Company sells its products directly to customers who are predominantly service providers and to channel partners that sell on its behalf. The following table presents the Company's revenue disaggregated by sales channel (in thousands): Three Months Ended Nine Months Ended September 30, September 24, September 30, September 24, Direct $ 264,076 $ 287,055 $ 768,456 $ 821,666 Indirect 128,293 103,392 392,216 265,640 Total revenue $ 392,369 $ 390,447 $ 1,160,672 $ 1,087,306 Contract Balances The following table provides information about receivables, contract assets and contract liabilities from contracts with customers (in thousands): September 30, December 31, Assets (Liabilities) Accounts receivable, net $ 328,863 $ 419,735 Contract assets $ 37,407 $ 60,172 Deferred revenue $ (121,950) $ (181,679) Revenue recognized for the three- and nine-months ended September 30, 2023 that was included in the deferred revenue balance at the beginning of the reporting period was $17.4 million and $112.7 million, respectively. Revenue recognized for the three- and nine-months ended September 24, 2022 that was included in the deferred revenue balance at the beginning of the reporting period was $21.5 million and $92.0 million, respectively. Changes in the contract asset and liability balances during the three- and nine-month periods ended September 30, 2023 and September 24, 2022 were not materially impacted by other factors. Transaction Price Allocated to the Remaining Performance Obligation The Company’s remaining performance obligations represent the transaction price allocated to performance obligations that are unsatisfied or partially satisfied, consisting of deferred revenue and backlog. The Company’s backlog represents purchase orders received from customers for future product shipments and services. The Company’s backlog is subject to future events that could cause the amount or timing of the related revenue to change, and, in certain cases, may be canceled without penalty. Orders in backlog may be fulfilled several quarters following receipt or may relate to multi-year support service obligations. The following table includes estimated revenue expected to be recognized in the future related to performance obligations that are unsatisfied (or partially satisfied) pursuant to contracts that are not subject to cancellation without penalty at the end of the reporting period (in thousands): Remainder of 2023 2024 2025 2026 2027 Thereafter Total Revenue expected to be recognized in the future as of September 30, 2023 $ 347,267 $ 132,403 $ 18,163 $ 8,660 $ 6,182 $ 3,378 $ 516,053

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2023
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements Disclosure of Fair Values Financial instruments that are not re-measured at fair value include accounts receivable, accounts payable, accrued liabilities, and debt. The carrying values of these financial instruments other than the Company's 2024 Notes, 2027 Notes and 2028 Notes (as defined below and collectively referred to as "convertible senior notes") approximate their fair values. The fair value of convertible senior notes was determined based on the quoted bid price of the convertible senior notes in an over-the-counter market on September 29, 2023 (the last trading day of the quarter). The following table presents the estimated fair values of the convertible senior notes (in thousands): As of September 30, 2023 As of December 31, 2022 Fair Value Measured Using Fair Value Measured Using Level 1 Level 2 Total Level 1 Level 2 Total Convertible senior notes $ — $ 630,605 $ 630,605 $ — $ 785,364 $ 785,364 Cash equivalents are measured and reported at fair value on a recurring basis. The following table presents the fair value of these financial assets and their levels within the fair value hierarchy (in thousands): As of September 30, 2023 As of December 31, 2022 Fair Value Measured Using Fair Value Measured Using Level 1 Level 2 Total Level 1 Level 2 Total Money market funds $ 70,000 $ — $ 70,000 $ 95,000 $ — $ 95,000 During the nine-months ended September 30, 2023, there were no transfers of assets or liabilities between Level 1 and Level 2 of the fair value hierarchy. As of each of September 30, 2023 and December 31, 2022, none of the Company’s existing assets or liabilities were classified as Level 3. The Company measures goodwill and intangible assets at fair value on a nonrecurring basis when there are identifiable events or changes in circumstances that may have a significant adverse impact on the fair value of these assets. The Company performed an analysis of impairment indicators of these assets and noted no adverse impact to their fair values as of September 30, 2023. Facilities-related Charges The Company classifies certain facilities-related charges within Level 3 of the fair value hierarchy and applies fair value accounting on a nonrecurring basis when impairment indicators exist or upon the existence of observable fair values. In connection with its restructuring plans (as discussed in Note 7, “Restructuring and Other Related Costs” to the notes to condensed consolidated financial statements), the Company incurred facilities-related charges of $0.4 million and $2.6 million for the three- and nine-months ended September 30, 2023, respectively. The Company incurred facilities-related charges of $1.1 million and $7.5 million for the three- and nine-months ended September 24, 2022, respectively. These charges primarily consisted of impairment charges incurred for operating lease right-of-use assets and were calculated at fair value based on estimated future sublease rental receipts that the Company could reasonably obtain over the remaining lease term at the discount rate. Facilities-related charges are classified as Level 3 measurement due to the significance of these unobservable inputs. See Note 7, "Restructuring and Other Related Costs" to the notes to condensed consolidated financial statements for more information. Cash, Cash Equivalents and Restricted Cash As of September 30, 2023, the Company had $126.6 million of cash, cash equivalents and restricted cash, including $47.0 million of cash held by its foreign subsidiaries. As of December 31, 2022, the Company had $189.2 million of cash, cash equivalents and restricted cash, including $65.9 million of cash held by its foreign subsidiaries. The Company's cash held by its foreign subsidiaries is used for operating and investing activities in those locations, and the Company does not currently have the need or the intent to repatriate those funds to the U.S.

Goodwill and Intangible Assets

Goodwill and Intangible Assets	9 Months Ended
	Sep. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	Goodwill and Intangible Assets Goodwill Goodwill is recorded when the purchase price of an acquisition exceeds the fair value of the net tangible and identified intangible assets acquired. The following table presents details of the Company’s goodwill during the nine-months ended September 30, 2023 (in thousands): Balance as of December 31, 2022 $ 232,663 Foreign currency translation adjustments (7,444) Balance as of September 30, 2023 $ 225,219 The gross carrying amount of goodwill may change due to the effects of foreign currency fluctuations as a portion of these assets are denominated in foreign currency. To date, the Company has not recognized any impairment losses on goodwill. Intangible Assets The following tables present details of the Company’s intangible assets as of September 30, 2023 and December 31, 2022 (in thousands, except for weighted average data): September 30, 2023 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Weighted Average Remaining Useful Life (In Years) Intangible assets with finite lives: Customer relationships $ 110,318 $ (83,243) $ 27,075 3.0 Developed technology 148,733 (148,733) — — Total intangible assets with finite lives $ 259,051 $ (231,976) $ 27,075 December 31, 2022 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Weighted Average Remaining Useful Life (In Years) Intangible assets with finite lives: Customer relationships and backlog $ 151,461 $ (114,294) $ 37,167 3.5 Developed technology 170,467 (159,847) 10,620 0.7 Total intangible assets with finite lives $ 321,928 $ (274,141) $ 47,787 The gross carrying amount of intangible assets and the related amortization expense of intangible assets may change due to the effects of foreign currency fluctuations as a portion of these assets are denominated in foreign currency. Amortization expenses were $6.5 million and $20.7 million for the three- and nine-months ended September 30, 2023, respectively. Amortization expenses were $9.8 million and $29.7 million for the three- and nine-months ended September 24, 2022, respectively. Intangible assets are carried at cost less accumulated amortization and impairment, if any. Amortization expenses are recorded to the appropriate cost and expense categories. The following table summarizes the Company’s estimated future amortization expense of intangible assets with finite lives as of September 30, 2023 (in thousands): Fiscal Years Total Remainder of 2023 2024 2025 2026 2027 Thereafter Total future amortization expense $ 27,075 $ 2,256 $ 9,025 $ 9,025 $ 6,769 $ — $ —

Balance Sheet Details

Balance Sheet Details	9 Months Ended
	Sep. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Balance Sheet Details	Balance Sheet Details Restricted Cash The Company’s restricted cash balance is held in deposit accounts at various banks globally. These amounts primarily collateralize the Company’s issuances of standby letters of credit and bank guarantees. Allowance for Credit Losses The following table provides a rollforward of the allowance for credit losses for accounts receivable for the nine-months ended September 30, 2023 (in thousands): Balance as of December 31, 2022 $ 1,422 Additions (1) 267 Write offs (2) (390) Recoveries during the period (333) Balance as of September 30, 2023 $ 966 (1) The new additions during the nine-months ended September 30, 2023 are primarily due to specific reserves. (2) The write offs during the nine-months ended September 30, 2023 are primarily amounts fully reserved previously. Accounts Receivable Factoring The Company sells certain designated trade account receivables based on factoring arrangements with well-established factoring companies. Pursuant to the terms of the arrangements, the Company accounts for these transactions in accordance with ASC Topic 860, "Transfers and Servicing". The Company's factor purchases trade accounts receivables on a non-recourse basis and without any further obligations. Trade accounts receivables balances sold are removed from the condensed consolidated balance sheets and cash received is reflected as cash provided by operating activities in the condensed consolidated statements of cash flows. The difference between the fair value of the Company's trade receivables and the proceeds received is recorded as interest expense in the Company's condensed consolidated statements of operations. For the three- and nine-months ended September 30, 2023, the Company's recognized factoring related interest expense was approximately $0.3 million and $0.7 million, respectively. For the three- and nine-months ended September 24, 2022, the Company's recognized factoring related interest expense was approximately $0.2 million and $0.4 million, respectively. For the three- and nine-months ended September 30, 2023, the Company's gross amount of trade accounts receivables sold were approximately $18.1 million and $52.5 million, respectively. For the three- and nine-months ended September 24, 2022, the Company's gross amount of trade accounts receivables sold were approximately $25.0 million and $67.6 million, respectively. Selected Balance Sheet Items The following table provides details of selected balance sheet items (in thousands): September 30, December 31, Inventory Raw materials $ 110,353 $ 48,688 Work in process 69,916 66,591 Finished goods 276,611 259,576 Total inventory $ 456,880 $ 374,855 Property, plant and equipment, net Computer hardware $ 48,024 $ 46,454 Computer software (1) 76,973 62,102 Laboratory and manufacturing equipment 345,384 297,261 Land and building 12,372 12,369 Furniture and fixtures 2,843 2,828 Leasehold and building improvements 50,985 50,360 Construction in progress 35,879 42,418 Subtotal 572,460 513,792 Less accumulated depreciation and amortization (2) (371,742) (340,863) Total property, plant and equipment, net $ 200,718 $ 172,929 Accrued expenses and other current liabilities Loss contingency related to non-cancelable purchase commitments $ 16,789 $ 28,796 Taxes payable 40,251 42,757 Short-term operating and finance lease liability 13,002 11,701 Restructuring accrual 209 941 Other accrued expenses and other current liabilities 40,037 57,255 Total accrued expenses $ 110,288 $ 141,450 (1) Included in computer software at September 30, 2023 and December 31, 2022 were $34.7 million and $29.3 million, respectively, related to enterprise resource planning (“ERP”) systems that the Company implemented. The unamortized ERP costs at September 30, 2023 and December 31, 2022 were $10.8 million and $9.0 million, respectively. Also included in computer software at September 30, 2023 and December 31, 2022 was $32.4 million and $24.2 million, respectively, related to term licenses. The unamortized term license costs at September 30, 2023 and December 31, 2022 was $17.3 million and $9.1 million, respectively. (2) Depreciation expense was $13.5 million and $38.7 million (which includes depreciation of capitalized ERP cost of $1.3 million and $3.5 million, respectively) for the three- and nine-months ended September 30, 2023, respectively. Also included in depreciation expense for the three- and nine-months ended September 30, 2023 was $2.4 million and $6.8 million, respectively, related to term licenses. Depreciation expense was $11.5 million and $34.3 million (which includes depreciation of capitalized ERP cost of $1.1 million and $2.6 million, respectively) for the three- and nine-months ended September 24, 2022, respectively. Also included in depreciation expense for the three- and nine-months ended September 24, 2022 was $2.0 million and $5.5 million, respectively, related to term licenses.

Restructuring and Other Related

Restructuring and Other Related Costs	9 Months Ended
	Sep. 30, 2023
Restructuring and Related Activities [Abstract]
Restructuring and Other Related Costs	Restructuring and Other Related Costs In 2021, the Company announced a plan to restructure certain international research and development operations (the "2021 Restructuring Plan"). The 2021 Restructuring Plan is substantially completed. Additional restructuring activities may occur in the future in connection with the Company’s ongoing transformation initiatives. In the three- and nine-month periods ended September 30, 2023 and September 24, 2022, the Company incurred lease-related impairment charges from consolidation of various sites that resulted in abandonment of related leased facilities. This was a result of restructuring initiatives undertaken in previous years. The following table presents restructuring and other related costs included in cost of revenue and operating expenses in the accompanying condensed consolidated statements of operations under the restructuring plans (in thousands): Three Months Ended September 30, 2023 September 24, 2022 Cost of Operating Expenses Cost of Operating Expenses Severance and other related expenses $ — $ — $ 22 $ 32 Lease related impairment charges — 405 — 1,076 Others — (5) — 34 Total $ — $ 400 $ 22 $ 1,142 Nine Months Ended September 30, 2023 September 24, 2022 Cost of Operating Expenses Cost of Operating Expenses Severance and other related expenses $ — $ — $ 166 $ 1,789 Lease related impairment charges — 2,566 — 7,535 Others — 55 19 221 Total $ — $ 2,621 $ 185 $ 9,545 Restructuring liabilities are reported within accrued expenses and other long-term liabilities in the accompanying condensed consolidated balance sheets (in thousands): Severance and other related expenses Lease related impairment charges Others Total Balance at December 31, 2022 $ 792 $ — $ 149 $ 941 Charges — 2,566 55 2,621 Cash Payments (739) (1,371) (60) (2,170) Non-Cash Settlements and Other 9 (1,195) 3 (1,183) Balance at September 30, 2023 $ 62 $ — $ 147 $ 209 As of September 30, 2023, the Company's restructuring liability was primarily comprised of $0.2 million related to the 2021 Restructuring Plan. The liability related to the 2021 Restructuring Plan is expected to be paid by the end of 2023.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss	9 Months Ended
	Sep. 30, 2023
Equity [Abstract]
Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive Loss Accumulated other comprehensive loss includes certain changes in equity that are excluded from net loss. The following table sets forth the changes in accumulated other comprehensive loss by component for the nine-months ended September 30, 2023 (in thousands): Foreign Currency Translation Actuarial Gain (Loss) on Pension Total Balance at December 31, 2022 $ (49,632) $ 27,161 $ (22,471) Other comprehensive loss before reclassifications (21,936) (447) (22,383) Amounts reclassified from accumulated other comprehensive loss — (305) (305) Net current-period other comprehensive loss (21,936) (752) (22,688) Balance at September 30, 2023 $ (71,568) $ 26,409 $ (45,159)

Basic and Diluted Net Loss Per

Basic and Diluted Net Loss Per Common Share	9 Months Ended
	Sep. 30, 2023
Earnings Per Share [Abstract]
Basic and Diluted Net Loss Per Common Share	Basic and Diluted Net Loss Per Common Share Basic net loss per common share is computed by dividing net loss by the weighted average number of common shares outstanding during the period. Diluted net loss per common share is computed using net loss and the weighted average number of common shares outstanding plus potentially dilutive common shares outstanding during the period. Potentially dilutive common shares include the assumed release of outstanding restricted stock units (“RSUs”) and performance shares (referred to herein as the “PSUs”), assumed issuance of common stock under the Company’s 2007 Employee Stock Purchase Plan (the “ESPP”) using the treasury stock method, and shares of common stock issuable upon conversion of convertible senior notes. The Company includes the common shares underlying PSUs in the calculation of diluted net income per common share only when they become contingently issuable. As the Company incurred net losses during the three- and nine-month periods ended September 30, 2023 and September 24, 2022, all potentially issuable shares of common stock were determined to be anti-dilutive. The following table sets forth the computation of net loss per common share – basic and diluted (in thousands, except per share amounts): Three Months Ended Nine Months Ended September 30, September 24, September 30, September 24, Net loss $ (9,413) $ (11,930) $ (38,086) $ (109,501) Weighted average common shares outstanding - basic and diluted 228,077 217,620 225,465 215,104 Net loss per common share - basic and diluted $ (0.04) $ (0.05) $ (0.17) $ (0.51) The following sets forth the potentially dilutive shares excluded from the computation of the diluted net loss per share because their effect was anti-dilutive (in thousands): Three Months Ended Nine Months Ended September 30, September 24, September 30, September 24, Convertible senior notes 28,019 49,866 34,412 62,227 Restricted stock units 13,144 14,030 14,313 15,585 Performance stock units 3,661 2,559 3,674 2,727 Employee stock purchase plan shares — 19 71 474 Total 44,824 66,474 52,470 81,013 The Company uses the if-converted method for calculating any potential dilutive effect of the convertible senior notes. The Company calculates diluted earnings per share assuming that all of the convertible senior notes permitted to be share settled were converted solely into shares of common stock at the beginning of the reporting period. The potential impact upon the conversion of the convertible senior notes was excluded from the calculation of diluted net loss per share for the three- and nine-month periods ended September 30, 2023 and September 24, 2022, because the effect would have been anti-dilutive.

Debt

Debt	9 Months Ended
	Sep. 30, 2023
Debt Disclosure [Abstract]
Debt	Debt The following is a summary of the Company's debt as of September 30, 2023 (in millions): Net Carrying Value Unpaid Principal Balance Contractual Maturity Date Current Long-Term 2024 Notes $ 18.7 $ — $ 18.7 September 2024 2027 Notes — 196.6 200.0 March 2027 2028 Notes — 461.3 473.8 August 2028 Mortgage 6.9 — 6.9 March 2024 Total Debt $ 25.6 $ 657.9 $ 699.4 The following is a summary of the Company's debt as of December 31, 2022 (in millions): Net Carrying Value Unpaid Principal Balance Contractual Maturity Date Current Long-Term 2024 Notes $ — $ 101.7 $ 102.7 September 2024 2027 Notes — 195.9 200.0 March 2027 2028 Notes — 363.3 373.8 August 2028 Mortgage 0.5 6.8 7.3 March 2024 Total Debt $ 0.5 $ 667.7 $ 683.8 Convertible Senior Notes In September 2018, the Company issued $402.5 million aggregate principal amount of 2.125% Convertible Senior Notes due 2024 (the "2024 Notes"). In March 2020, the Company issued $200.0 million aggregate principal amount of 2.5% Convertible Senior Notes due 2027 (the “2027 Notes"). In August 2022 and in June 2023, the Company issued $373.8 million and $100.0 million, respectively, aggregate principal amounts of 3.75% Convertible Senior Notes due 2028 (together, the "2028 Notes," and together with the 2024 Notes and 2027 Notes, the “convertible senior notes”). The 2024 Notes bear interest at a fixed rate of 2.125% per year, payable semi-annually in arrears on March 1 and September 1 of each year, beginning on March 1, 2019. The 2027 Notes bear interest at a fixed rate of 2.5% per year, payable semi-annually in arrears on March 1 and September 1 of each year, beginning on September 1, 2020. The 2028 Notes bear interest at a fixed rate of 3.75% per year, payable semi-annually in arrears on February 1 and August 1 of each year, beginning on February 1, 2023. No sinking fund is provided for the convertible senior notes. There have been no changes to the initial conversion price of the convertible senior notes since issuance and during the three- and nine-months ended September 30, 2023. None of the conditions allowing holders of the convertible senior notes to convert early were met. The convertible senior notes were therefore not convertible during the three- and nine-months ended September 30, 2023. Exchange and Repurchase In June 2023, the Company issued $100.0 million in additional aggregate principal amount (the "Additional 2028 Notes") of its currently outstanding 3.75% Convertible Senior Notes due 2028 (the "Existing 2028 Notes"). The Additional 2028 Notes were issued under an indenture dated as of August 8, 2022, by and between the Company and U.S. Bank Trust Company, National Association, as trustee. The Additional 2028 Notes constitute a further issuance of, and form a single series with, the Existing 2028 Notes issued on August 8, 2022 in the aggregate principal amount of $373.8 million and have substantially identical terms, including conversion rate, conversion price, convertible dates, redemption rights, conditions for conversion, settlement provisions and ranking. The net proceeds to the Company from this issuance of Additional 2028 Notes were approximately $96.5 million after deducting the placement agent's fee, other debt issuance costs and discount. The Company used approximately $84.0 million of the net proceeds from this issuance to repurchase approximately $83.9 million in aggregate principal amount, which included accrued and unpaid interest, of its 2024 Notes concurrently with the issuance. This transaction involved a contemporaneous exchange of cash between the Company and holders of the 2024 Notes participating in the issuance of the Additional 2028 Notes. Accordingly, the transaction was evaluated for modification or extinguishment accounting in accordance with ASC 470-50, Debt – Modifications and Extinguishments on a creditor-by-creditor basis depending on whether the exchange was determined to have substantially different terms. The repurchase of the 2024 Notes and issuance of the Additional 2028 Notes were deemed to have substantially different terms based on the present value of the cash flows or significant difference between the value of the conversion option immediately prior to and after the exchange. Therefore, the repurchase of the 2024 Notes was accounted for as a debt extinguishment. The Company recorded an immaterial loss on extinguishment of debt in interest expense, in the condensed consolidated statements of operations for the nine-months ended September 30, 2023, which includes the write-off of the related deferred issuance costs. Interest Expense The following table presents the interest expense related to the contractual interest coupon and the amortization of debt issuance costs on the Company's convertible senior notes (in thousands): Three Months Ended Nine Months Ended September 30, September 24, September 30, September 24, Contractual interest expense $ 5,803 $ 4,513 $ 16,472 $ 11,291 Amortization of debt issuance costs and discount 799 1,087 3,243 2,626 Total interest expense $ 6,602 $ 5,600 $ 19,715 $ 13,917 The issuance cost and discount related to the 2024 Notes, the 2027 Notes and the 2028 Notes are being amortized to interest expense over the respective contractual term, at effective interest rates of 2.6%, 3.0% and 4.3%, respectively. Unamortized debt issuance costs and discount will be amortized over the remaining life of the 2024 Notes, the 2027 Notes and the 2028 Notes which is approximately 11 months, 41 months, and 58 months, respectively. The net carrying amount of the convertible senior notes as of September 30, 2023 and as of December 31, 2022 was as follows (in thousands): 2024 Notes 2027 Notes 2028 Notes September 30, 2023 December 31, 2022 September 30, 2023 December 31, 2022 September 30, 2023 December 31, 2022 Principal $ 18,747 $ 102,652 $ 200,000 $ 200,000 $ 473,750 $ 373,750 Unamortized issuance costs and discount — (926) (3,412) (4,121) (12,402) (10,401) Net carrying amount $ 18,747 $ 101,726 $ 196,588 $ 195,879 $ 461,348 $ 363,349 Asset-based revolving credit facility On June 24, 2022, the Company entered into a Loan, Guaranty and Security Agreement (as amended, the “Loan Agreement”) with the lenders party thereto, and Bank of America, N.A., as agent. The Loan Agreement provides for a senior secured asset-based revolving credit facility of up to $200 million (the "Credit Facility"), which the Company may draw upon from time to time. The Company may increase the total commitments under the revolving credit facility by up to an additional $100 million, subject to certain conditions. In addition, the Loan Agreement provides for a $50 million letter of credit subfacility and a $20 million swingline loan facility. The Credit Facility has a stated maturity date of June 24, 2027. Availability under the Credit Facility is based upon periodic borrowing base certifications valuing certain inventory and accounts receivable, as reduced by certain reserves. The Credit Facility is secured by a first-priority security interest (subject to certain exceptions) in inventory, certain related assets, specified deposit accounts, and certain other accounts. Outstanding borrowings accrue interest at floating rates plus an applicable margin of 1.25% to 1.75% for Term Secured Overnight Financing Rate loans and 0.25% to 0.75% for base rate loans. The unused line fee rate payable on the unused portion of the Credit Facility is equal to 0.25% per annum based on utilization of the Credit Facility. The Loan Agreement also contains certain customary affirmative and negative covenants, including a financial covenant that requires the Company to maintain a minimum fixed charge coverage ratio. As of September 30, 2023, the Company was in compliance with all covenants under the Loan Agreement. As of September 30, 2023, the Company had availability of $158.8 million under the Credit Facility. As of September 30, 2023, the Loan Agreement included a $50.0 million letter of credit subfacility and $23.2 million of letters of credit were issued and outstanding. Mortgage Payable In March 2019, the Company mortgaged a property it owns. The Company received proceeds of $8.7 million in connection with the loan. The loan carries a fixed interest rate of 5.25% and is repayable in 59 equal monthly installments of principal balance plus accrued unpaid interest due five years from the date of the loan. On September 24, 2021, the loan was amended to reduce the interest rate from 5.25% to 3.80% for the remaining 31 equal monthly installments of approximately $0.1 million each. As of September 30, 2023, $6.9 million of the loan remained outstanding and is included in short-term debt, net in the condensed consolidated balance sheets.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2023
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies The following table sets forth commitments and contingencies related to the Company's various obligations (in thousands): Payments Due by Period Total Remainder of 2023 2024 2025 2026 2027 Thereafter Operating leases (1)(2) $ 62,873 $ 4,066 $ 15,777 $ 13,782 $ 10,437 $ 8,133 $ 10,678 Finance lease obligations (3) 5,436 249 1,296 1,119 1,003 956 813 2028 Notes, including interest (4) 562,579 — 17,766 17,766 17,766 17,766 491,515 2027 Notes, including interest (4) 217,500 — 5,000 5,000 5,000 202,500 — 2024 Notes, including interest (4) 19,145 — 19,145 — — — — Mortgage Payable, including interest (4) 7,025 196 6,829 — — — — Total contractual obligations $ 874,558 $ 4,511 $ 65,813 $ 37,667 $ 34,206 $ 229,355 $ 503,006 (1) The Company leases facilities under non-cancelable operating lease agreements. These leases have varying terms that range from one (2) The Company has contractual commitments to remove leasehold improvements and return certain properties to a specified condition when the leases terminate. At the inception of a lease with such conditions, the Company records an asset retirement obligation liability and a corresponding capital asset in an amount equal to the estimated fair value of the obligation. Asset retirement obligations were $4.6 million and $4.9 million as of September 30, 2023 and December 31, 2022, respectively. Of the $4.6 million as of September 30, 2023, $4.4 million is classified as other long-term liabilities on the accompanying condensed consolidated balance sheets. The remainder is classified as accrued expenses and other current liabilities. (3) The Company has finance leases for manufacturing and other equipment. The above payment schedule includes interest. See Note 2, "Leases" to the notes to condensed consolidated financial statements for more information. (4) See Note 10, "Debt" to the notes to condensed consolidated financial statements for more information. Legal Matters NextGen Innovations, LLC On August 9, 2022, NextGen Innovations, LLC ("NextGen") filed a complaint against the Company in the U.S. District Court for the Eastern District of Texas. The complaint asserts that through certain products the Company infringed on U.S. Patent Nos. 9,887,795, 10,263,723, and 10,771,181. The complaint alleges that NextGen is entitled to unspecified damages, costs, fees, expenses, interest, and injunctive relief. The Company is currently unable to predict the outcome of this litigation and therefore cannot reasonably estimate the possible loss or range of loss, if any, arising from this matter. In addition to the matter described above, the Company is subject to various legal proceedings, claims and litigation arising in the ordinary course of business. While the outcome of these matters is currently not determinable, the Company does not expect that the ultimate costs to resolve these matters will have a material effect on its condensed consolidated financial position, results of operations or cash flows. Loss Contingencies The Company is subject to the possibility of various losses arising in the ordinary course of business. These may relate to disputes, litigation and other legal actions. In the preparation of its quarterly and annual financial statements, the Company considers the likelihood of loss or the incurrence of a liability, including whether it is probable, reasonably possible or remote that a liability has been incurred, as well as the Company’s ability to reasonably estimate the amount of loss, in determining loss contingencies. In accordance with U.S. GAAP, an estimated loss contingency is accrued when it is probable that a liability has been incurred and the amount of loss can be reasonably estimated. The Company regularly evaluates current information to determine whether any accruals should be adjusted and whether new accruals are required. As of each of September 30, 2023 and December 31, 2022, the Company has accrued the estimated liabilities associated with certain loss contingencies. Indemnification Obligations From time to time, the Company enters into certain types of contracts that contingently require it to indemnify parties against third-party claims. The terms of such indemnification obligations vary. These contracts may relate to: (i) certain real estate leases under which the Company may be required to indemnify property owners for environmental and other liabilities, and other claims arising from the Company’s use of the applicable premises; and (ii) certain agreements with the Company’s officers, directors and certain key employees, under which the Company may be required to indemnify such persons for liabilities. In addition, the Company has agreed to indemnify certain customers for claims made against the Company’s products, where such claims allege infringement of third-party intellectual property rights, including, but not limited to, patents, registered trademarks, and/or copyrights. Under the aforementioned intellectual property indemnification clauses, the Company may be obligated to defend the customer and pay for the damages awarded against the customer under an infringement claim as well as the customer’s attorneys’ fees and costs. These indemnification obligations generally do not expire after termination or expiration of the agreement containing the indemnification obligation. In certain cases, there are limits on and exceptions to the Company’s potential liability for indemnification. The Company cannot estimate the amount of potential future payments, if any, that it might be required to make as a result of these agreements. The maximum potential amount of any future payments that the Company could be required to make under these indemnification obligations could be significant. As permitted under Delaware law and the Company’s charter and bylaws, the Company has agreements whereby it indemnifies certain of its officers and each of its directors. The term of the indemnification period is for the officer’s or director’s lifetime for certain events or occurrences while the officer or director is, or was, serving at the Company’s request in such capacity. The maximum potential amount of future payments the Company could be required to make under these indemnification agreements could be significant; however, the Company has a director and officer insurance policy that may reduce its exposure and enable it to recover all or a portion of any future amounts paid. As a result of its insurance policy coverage, the Company believes the estimated fair value of these indemnification agreements is minimal.

Stockholders' Equity

Stockholders' Equity	9 Months Ended
	Sep. 30, 2023
Share-Based Payment Arrangement [Abstract]
Stockholders' Equity	Stockholders’ Equity 2016 Equity Incentive Plan In May 2023, the stockholders approved amendments to the 2016 Equity Incentive Plan to increase the number of shares of common stock reserved for issuance by an additional 8.1 million shares. As of September 30, 2023, the Company reserved a total of 51.8 million shares of common stock under this plan. Stock-based Compensation Plans The Company has stock-based compensation plans pursuant to which the Company has granted RSUs and PSUs. The Company also had an ESPP for all eligible employees which was indefinitely suspended, effective upon the expiration of the offering period that ended August 15, 2023. (in thousands except weighted average data) Number of Weighted Aggregate Outstanding at December 31, 2022 12,588 $ 8.13 $ 84,847 RSUs granted 6,896 $ 7.01 RSUs released (5,882) $ 8.13 $ 36,871 RSUs canceled (458) $ 8.01 Outstanding at September 30, 2023 13,144 $ 7.55 54,941 (in thousands except weighted average data) Number of Weighted Aggregate Outstanding at December 31, 2022 2,559 $ 7.40 $ 17,251 PSUs granted 1,835 $ 7.26 PSUs canceled (733) $ 5.94 Outstanding at September 30, 2023 3,661 $ 7.63 $ 15,303 The aggregate intrinsic value of unreleased RSUs and unreleased PSUs is calculated using the closing price of the Company's common stock of $4.18 at September 29, 2023 (the last trading day of the quarter). The aggregate intrinsic value of RSUs and PSUs released is calculated using the fair market value of the common stock at the date of release. The following table presents total stock-based compensation cost for instruments granted but not yet fully amortized, of the Company’s equity compensation plans as of September 30, 2023. These costs are expected to be amortized on a straight-line basis over the following weighted-average periods (in thousands, except for weighted average period data): Unrecognized Weighted RSUs $ 80,160 2.02 PSUs $ 20,395 2.25 Stock-Based Compensation The following table summarizes the stock-based compensation expense related to the ESPP, RSUs, and PSUs (in thousands): Three Months Ended Nine Months Ended September 30, September 24, September 30, September 24, ESPP $ 726 $ 1,337 $ 3,798 $ 3,713 RSUs $ 13,660 $ 14,009 $ 40,431 $ 40,006 PSUs $ 1,344 $ (1,531) $ 5,413 $ 1,005 The following tables summarize the effects of stock-based compensation on the Company’s condensed consolidated balance sheets and statements of operations for the periods presented (in thousands): September 30, December 31, Stock-based compensation effects in inventory $ 4,228 $ 3,979 Three Months Ended Nine Months Ended September 30, September 24, September 30, September 24, Income tax benefit associated with stock-based compensation $ 2,144 $ 2,296 $ 6,335 $ 7,130 Stock-based compensation effects in net loss before income taxes Cost of revenue $ 2,515 $ 2,239 $ 7,672 $ 6,722 Research and development 5,734 5,768 17,557 17,261 Sales and marketing 3,706 3,201 11,371 10,015 General and administration 3,790 2,488 12,793 10,420 Total stock-based compensation expense $ 15,745 $ 13,696 $ 49,393 $ 44,418

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2023
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Income taxes for the three- and nine-months ended September 30, 2023 represented a tax expense of $2.5 million and $12.5 million on pre-tax losses of $6.9 million and $25.6 million, respectively. This compared to a tax expense of $4.8 million and $16.6 million, on pre-tax losses of $7.1 million and $92.9 million for the three- and nine-months ended September 24, 2022, respectively. Provision for income taxes decreased by approximately $2.3 million and $4.1 million during the three- and nine-months ended September 30, 2023 respectively, compared to the corresponding period in 2022 as a result of a decrease in income taxes and withholding taxes in certain foreign jurisdictions due to an internal restructuring of supply chain and customer-facing entities. The Company must assess the likelihood that some portion or all of its deferred tax assets will be recovered from future taxable income within the respective jurisdictions. In the past, the Company established a valuation allowance against its deferred tax assets as it determined that its ability to recover the value of these assets did not meet the “more-likely-than-not” standard. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during the periods in which those temporary differences become deductible. Management judgment is required on an ongoing basis to determine whether it needs to maintain the valuation allowance recorded against its net deferred tax assets. The Company must consider all positive and negative evidence, including its forecasts of taxable income over the applicable carryforward periods, its current financial performance, its market environment and other factors in evaluating the need for a valuation allowance against its net U.S. deferred tax assets. As of September 30, 2023, the Company does not believe that it is more-likely-than-not that it would be able to utilize its domestic deferred tax assets in the foreseeable future. Accordingly, the domestic net deferred tax assets continued to be fully reserved with a valuation allowance. To the extent that the Company determines that deferred tax assets are realizable on a more-likely-than-not basis, and adjustment is needed, that adjustment will be recorded in the period that the determination is made and would generally decrease the valuation allowance and record a corresponding benefit to earnings.

Segment Information

Segment Information	9 Months Ended
	Sep. 30, 2023
Segment Reporting [Abstract]
Segment Information	Segment Information Operating segments are defined as components of an enterprise about which separate financial information is available that is evaluated regularly by the chief operating decision maker, or decision-making group, in deciding how to allocate resources and in assessing performance. The Company’s chief operating decision maker is the Company’s Chief Executive Officer (the "CEO”). The CEO reviews financial information presented on a condensed consolidated basis, accompanied by information about revenue by geographic region for purposes of allocating resources and evaluating financial performance. The Company has one business activity as a provider of optical transport networking equipment, software and related services. Accordingly, the Company is considered a single reporting segment and operating unit structure. Revenue by geographic region is based on the shipping address of the customer. For more information regarding revenue disaggregated by geography, see Note 3, “Revenue Recognition” to the notes to condensed consolidated financial statements. Additionally, the following table sets forth the Company's property, plant and equipment, net by geographic region (in thousands): September 30, December 31, 2022 United States $ 183,641 $ 156,065 Other Americas 2,832 2,908 Europe, Middle East and Africa 9,720 10,285 Asia Pacific 4,525 3,671 Total property, plant and equipment, net $ 200,718 $ 172,929

Guarantees

Guarantees	9 Months Ended
	Sep. 30, 2023
Guarantees [Abstract]
Guarantees	Guarantees Product Warranties Activity related to product warranty was as follows (in thousands): Three Months Ended Nine Months Ended September 30, September 24, September 30, September 24, Beginning balance $ 35,397 $ 36,769 $ 36,621 $ 44,310 Charges to operations 4,998 8,603 14,830 19,831 Utilization (5,064) (4,179) (15,819) (14,910) Change in estimate (1) 527 (2,221) 226 (10,259) Balance at the end of the period $ 35,858 $ 38,972 $ 35,858 $ 38,972 (1) The Company records product warranty liabilities based on the latest quality and cost information available as of the date the revenue is recorded. The changes in estimate shown here are due to changes in overall actual failure rates, the mix of new compared to used units related to replacement of failed units, and changes in the estimated cost of repair and product recalls. As the Company's products mature over time, failure rates and repair costs associated with such products generally decline, leading to favorable changes in warranty reserves. Letters of Credit and Bank Guarantees The Company had $24.8 million and $24.7 million of standby letters of credit, bank guarantees and surety bonds outstanding as of September 30, 2023 and December 31, 2022, respectively. Details are provided in the table below (in thousands). September 30, December 31, Customer performance guarantees $ 20,052 $ 20,903 Value added tax license 2,827 1,434 Property leases 1,928 2,398 Total $ 24,807 $ 24,735 Of the $20.1 million related to customer performance guarantees as of September 30, 2023, approximately $4.0 million was used to secure surety bonds in the aggregate of $7.5 million. Of the $20.9 million related to customer performance guarantees as of December 31, 2022, approximately $4.0 million was used to secure surety bonds in the aggregate of $7.5 million. As of September 30, 2023, of the aforementioned standby letters of credit and bank guarantees outstanding, $1.9 million was backed by cash collateral.

Pension and Post-Retirement Ben

Pension and Post-Retirement Benefit Plans	9 Months Ended
	Sep. 30, 2023
Retirement Benefits [Abstract]
Pension and Post-Retirement Benefit Plans	Pension and Post-Retirement Benefit Plans Components of Net Periodic Benefit Cost Net periodic benefit cost for the Company's pension and other post-retirement benefit plans consisted of the following (in thousands): Three Months Ended Nine Months Ended September 30, September 24, September 30, September 24, Service cost $ 38 $ 71 $ 189 $ 227 Interest cost 775 297 2,325 944 Expected return on plan assets (659) (697) (1,977) (2,216) Amortization of actuarial (gain) loss (108) 77 (305) 246 Total net periodic benefit cost $ 46 $ (252) $ 232 $ (799) The service cost component is included in operating expenses in the Company's condensed consolidated statements of operations. All other components are included in Other (expense) income, net in the Company's condensed consolidated statements of operations.

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 24, 2022	Sep. 30, 2023	Sep. 24, 2022
Pay vs Performance Disclosure
Net loss	$ (9,413)	$ (11,930)	$ (38,086)	$ (109,501)

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
	Sep. 30, 2023
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

Basis of Presentation and Sig_2

Basis of Presentation and Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2023
Accounting Policies [Abstract]
Accounting Pronouncements Not Yet Adopted	Accounting Pronouncements Not Yet Adopted Segment Reporting Disclosures In November 2023, the FASB issued ASU 2023-07, “Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures.” The standard improves reportable segment disclosure requirements for public business entities primarily through enhanced disclosures about significant segment expenses that are regularly provided to the chief operating decision maker (“CODM”) and included within each reported measure of segment profit (referred to as the “significant expense principle”). The standard will become effective for fiscal year 2024 annual financial statements and interim financial statements thereafter and will be applied retrospectively for all prior periods presented in the financial statements, with early adoption permitted. The Company plans to adopt the standard when it becomes effective beginning in fiscal year 2024 annual financial statements, and is currently evaluating the impact this guidance will have on the disclosures included in the Notes to the Consolidated Financial Statements. Income Tax Disclosures In December 2023, the FASB issued ASU 2023-09, “Income Taxes (Topic 740): Improvements to Income Tax Disclosures.” The standard enhances income tax disclosure requirements for all entities by requiring specified categories and greater disaggregation within the rate reconciliation table, disclosure of income taxes paid by jurisdiction, and providing clarification on uncertain tax positions and related financial statement impacts. The standard will be effective for fiscal year 2024 annual financial statements with early adoption permitted. The Company plans to adopt the standard when it becomes effective beginning in fiscal year 2024 annual financial statements, and expects the adoption of the standard will impact certain of the income tax disclosures.

Leases (Tables)

Leases (Tables)	9 Months Ended
	Sep. 30, 2023
Leases [Abstract]
Schedule of Current and Long-Term Portion of Operating Lease Liabilities	The following table presents current and long-term portion of operating lease liabilities as classified in the condensed consolidated balance sheets (in thousands): September 30, December 31, Accrued expenses and other current liabilities $ 11,875 $ 10,948 Other long-term liabilities 39,158 45,862 Total operating lease liability $ 51,033 $ 56,810
Schedule of Operating Lease Liabilities	The following table presents maturity of lease liabilities under the Company's non-cancelable leases as of September 30, 2023 (in thousands): Operating Lease Finance Lease Total lease payments $ 62,873 $ 5,436 Less: interest (1) 11,840 781 Present value of lease liabilities $ 51,033 $ 4,655 (1) Calculated using the interest rate for each lease. The following table sets forth commitments and contingencies related to the Company's various obligations (in thousands): Payments Due by Period Total Remainder of 2023 2024 2025 2026 2027 Thereafter Operating leases (1)(2) $ 62,873 $ 4,066 $ 15,777 $ 13,782 $ 10,437 $ 8,133 $ 10,678 Finance lease obligations (3) 5,436 249 1,296 1,119 1,003 956 813 2028 Notes, including interest (4) 562,579 — 17,766 17,766 17,766 17,766 491,515 2027 Notes, including interest (4) 217,500 — 5,000 5,000 5,000 202,500 — 2024 Notes, including interest (4) 19,145 — 19,145 — — — — Mortgage Payable, including interest (4) 7,025 196 6,829 — — — — Total contractual obligations $ 874,558 $ 4,511 $ 65,813 $ 37,667 $ 34,206 $ 229,355 $ 503,006 (1) The Company leases facilities under non-cancelable operating lease agreements. These leases have varying terms that range from one (2) The Company has contractual commitments to remove leasehold improvements and return certain properties to a specified condition when the leases terminate. At the inception of a lease with such conditions, the Company records an asset retirement obligation liability and a corresponding capital asset in an amount equal to the estimated fair value of the obligation. Asset retirement obligations were $4.6 million and $4.9 million as of September 30, 2023 and December 31, 2022, respectively. Of the $4.6 million as of September 30, 2023, $4.4 million is classified as other long-term liabilities on the accompanying condensed consolidated balance sheets. The remainder is classified as accrued expenses and other current liabilities. (3) The Company has finance leases for manufacturing and other equipment. The above payment schedule includes interest. See Note 2, "Leases" to the notes to condensed consolidated financial statements for more information. (4) See Note 10, "Debt" to the notes to condensed consolidated financial statements for more information.
Schedule of Finance Lease Liabilities	The following table presents maturity of lease liabilities under the Company's non-cancelable leases as of September 30, 2023 (in thousands): Operating Lease Finance Lease Total lease payments $ 62,873 $ 5,436 Less: interest (1) 11,840 781 Present value of lease liabilities $ 51,033 $ 4,655 (1) Calculated using the interest rate for each lease. The following table sets forth commitments and contingencies related to the Company's various obligations (in thousands): Payments Due by Period Total Remainder of 2023 2024 2025 2026 2027 Thereafter Operating leases (1)(2) $ 62,873 $ 4,066 $ 15,777 $ 13,782 $ 10,437 $ 8,133 $ 10,678 Finance lease obligations (3) 5,436 249 1,296 1,119 1,003 956 813 2028 Notes, including interest (4) 562,579 — 17,766 17,766 17,766 17,766 491,515 2027 Notes, including interest (4) 217,500 — 5,000 5,000 5,000 202,500 — 2024 Notes, including interest (4) 19,145 — 19,145 — — — — Mortgage Payable, including interest (4) 7,025 196 6,829 — — — — Total contractual obligations $ 874,558 $ 4,511 $ 65,813 $ 37,667 $ 34,206 $ 229,355 $ 503,006 (1) The Company leases facilities under non-cancelable operating lease agreements. These leases have varying terms that range from one (2) The Company has contractual commitments to remove leasehold improvements and return certain properties to a specified condition when the leases terminate. At the inception of a lease with such conditions, the Company records an asset retirement obligation liability and a corresponding capital asset in an amount equal to the estimated fair value of the obligation. Asset retirement obligations were $4.6 million and $4.9 million as of September 30, 2023 and December 31, 2022, respectively. Of the $4.6 million as of September 30, 2023, $4.4 million is classified as other long-term liabilities on the accompanying condensed consolidated balance sheets. The remainder is classified as accrued expenses and other current liabilities. (3) The Company has finance leases for manufacturing and other equipment. The above payment schedule includes interest. See Note 2, "Leases" to the notes to condensed consolidated financial statements for more information. (4) See Note 10, "Debt" to the notes to condensed consolidated financial statements for more information.
Schedule of Lease Costs	The following table presents supplemental information for the Company's non-cancelable leases for the nine-months ended September 30, 2023 (in thousands, except for weighted average and percentage data): Operating Lease Finance Lease Weighted average remaining lease term 4.79 years 4.24 years Weighted average discount rate 9.32 % 9.88 % Cash paid for amounts included in the measurement of lease liabilities $ 12,261 $ 784 Leased assets obtained in exchange for new lease liabilities $ 3,104 $ 4,363

Revenue Recognition (Tables)

Revenue Recognition (Tables)	9 Months Ended
	Sep. 30, 2023
Revenue from Contract with Customer [Abstract]
Schedule of Disaggregation of Revenue	The following table presents the Company's revenue disaggregated by geography, based on the shipping address of the customer (in thousands): Three Months Ended Nine Months Ended September 30, September 24, September 30, September 24, United States $ 229,649 $ 222,071 $ 683,798 $ 573,786 Other Americas 25,361 21,496 69,073 75,232 Europe, Middle East and Africa 99,261 94,181 278,154 306,630 Asia Pacific 38,098 52,699 129,647 131,658 Total revenue $ 392,369 $ 390,447 $ 1,160,672 $ 1,087,306 The Company sells its products directly to customers who are predominantly service providers and to channel partners that sell on its behalf. The following table presents the Company's revenue disaggregated by sales channel (in thousands): Three Months Ended Nine Months Ended September 30, September 24, September 30, September 24, Direct $ 264,076 $ 287,055 $ 768,456 $ 821,666 Indirect 128,293 103,392 392,216 265,640 Total revenue $ 392,369 $ 390,447 $ 1,160,672 $ 1,087,306
Schedule of Contract with Customer, Asset and Liability	The following table provides information about receivables, contract assets and contract liabilities from contracts with customers (in thousands): September 30, December 31, Assets (Liabilities) Accounts receivable, net $ 328,863 $ 419,735 Contract assets $ 37,407 $ 60,172 Deferred revenue $ (121,950) $ (181,679)
Schedule of Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction	The following table includes estimated revenue expected to be recognized in the future related to performance obligations that are unsatisfied (or partially satisfied) pursuant to contracts that are not subject to cancellation without penalty at the end of the reporting period (in thousands): Remainder of 2023 2024 2025 2026 2027 Thereafter Total Revenue expected to be recognized in the future as of September 30, 2023 $ 347,267 $ 132,403 $ 18,163 $ 8,660 $ 6,182 $ 3,378 $ 516,053

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2023
Fair Value Disclosures [Abstract]
Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis	The following table presents the estimated fair values of the convertible senior notes (in thousands): As of September 30, 2023 As of December 31, 2022 Fair Value Measured Using Fair Value Measured Using Level 1 Level 2 Total Level 1 Level 2 Total Convertible senior notes $ — $ 630,605 $ 630,605 $ — $ 785,364 $ 785,364 As of September 30, 2023 As of December 31, 2022 Fair Value Measured Using Fair Value Measured Using Level 1 Level 2 Total Level 1 Level 2 Total Money market funds $ 70,000 $ — $ 70,000 $ 95,000 $ — $ 95,000

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill	The following table presents details of the Company’s goodwill during the nine-months ended September 30, 2023 (in thousands): Balance as of December 31, 2022 $ 232,663 Foreign currency translation adjustments (7,444) Balance as of September 30, 2023 $ 225,219
Schedule of Finite-Lived Intangible Assets	The following tables present details of the Company’s intangible assets as of September 30, 2023 and December 31, 2022 (in thousands, except for weighted average data): September 30, 2023 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Weighted Average Remaining Useful Life (In Years) Intangible assets with finite lives: Customer relationships $ 110,318 $ (83,243) $ 27,075 3.0 Developed technology 148,733 (148,733) — — Total intangible assets with finite lives $ 259,051 $ (231,976) $ 27,075 December 31, 2022 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Weighted Average Remaining Useful Life (In Years) Intangible assets with finite lives: Customer relationships and backlog $ 151,461 $ (114,294) $ 37,167 3.5 Developed technology 170,467 (159,847) 10,620 0.7 Total intangible assets with finite lives $ 321,928 $ (274,141) $ 47,787
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense	The following table summarizes the Company’s estimated future amortization expense of intangible assets with finite lives as of September 30, 2023 (in thousands): Fiscal Years Total Remainder of 2023 2024 2025 2026 2027 Thereafter Total future amortization expense $ 27,075 $ 2,256 $ 9,025 $ 9,025 $ 6,769 $ — $ —

Balance Sheet Details (Tables)

Balance Sheet Details (Tables)	9 Months Ended
	Sep. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Allowance for Credit Losses	The following table provides a rollforward of the allowance for credit losses for accounts receivable for the nine-months ended September 30, 2023 (in thousands): Balance as of December 31, 2022 $ 1,422 Additions (1) 267 Write offs (2) (390) Recoveries during the period (333) Balance as of September 30, 2023 $ 966 (1) The new additions during the nine-months ended September 30, 2023 are primarily due to specific reserves. (2) The write offs during the nine-months ended September 30, 2023 are primarily amounts fully reserved previously.
Schedule of Details of Selected Balance Sheet Items	The following table provides details of selected balance sheet items (in thousands): September 30, December 31, Inventory Raw materials $ 110,353 $ 48,688 Work in process 69,916 66,591 Finished goods 276,611 259,576 Total inventory $ 456,880 $ 374,855 Property, plant and equipment, net Computer hardware $ 48,024 $ 46,454 Computer software (1) 76,973 62,102 Laboratory and manufacturing equipment 345,384 297,261 Land and building 12,372 12,369 Furniture and fixtures 2,843 2,828 Leasehold and building improvements 50,985 50,360 Construction in progress 35,879 42,418 Subtotal 572,460 513,792 Less accumulated depreciation and amortization (2) (371,742) (340,863) Total property, plant and equipment, net $ 200,718 $ 172,929 Accrued expenses and other current liabilities Loss contingency related to non-cancelable purchase commitments $ 16,789 $ 28,796 Taxes payable 40,251 42,757 Short-term operating and finance lease liability 13,002 11,701 Restructuring accrual 209 941 Other accrued expenses and other current liabilities 40,037 57,255 Total accrued expenses $ 110,288 $ 141,450 (1) Included in computer software at September 30, 2023 and December 31, 2022 were $34.7 million and $29.3 million, respectively, related to enterprise resource planning (“ERP”) systems that the Company implemented. The unamortized ERP costs at September 30, 2023 and December 31, 2022 were $10.8 million and $9.0 million, respectively. Also included in computer software at September 30, 2023 and December 31, 2022 was $32.4 million and $24.2 million, respectively, related to term licenses. The unamortized term license costs at September 30, 2023 and December 31, 2022 was $17.3 million and $9.1 million, respectively. (2) Depreciation expense was $13.5 million and $38.7 million (which includes depreciation of capitalized ERP cost of $1.3 million and $3.5 million, respectively) for the three- and nine-months ended September 30, 2023, respectively. Also included in depreciation expense for the three- and nine-months ended September 30, 2023 was $2.4 million and $6.8 million, respectively, related to term licenses. Depreciation expense was $11.5 million and $34.3 million (which includes depreciation of capitalized ERP cost of $1.1 million and $2.6 million, respectively) for the three- and nine-months ended September 24, 2022, respectively. Also included in depreciation expense for the three- and nine-months ended September 24, 2022 was $2.0 million and $5.5 million, respectively, related to term licenses.

Restructuring and Other Relat_2

Restructuring and Other Related Costs (Tables)	9 Months Ended
	Sep. 30, 2023
Restructuring and Related Activities [Abstract]
Schedule of Restructuring and Other Related Costs	The following table presents restructuring and other related costs included in cost of revenue and operating expenses in the accompanying condensed consolidated statements of operations under the restructuring plans (in thousands): Three Months Ended September 30, 2023 September 24, 2022 Cost of Operating Expenses Cost of Operating Expenses Severance and other related expenses $ — $ — $ 22 $ 32 Lease related impairment charges — 405 — 1,076 Others — (5) — 34 Total $ — $ 400 $ 22 $ 1,142 Nine Months Ended September 30, 2023 September 24, 2022 Cost of Operating Expenses Cost of Operating Expenses Severance and other related expenses $ — $ — $ 166 $ 1,789 Lease related impairment charges — 2,566 — 7,535 Others — 55 19 221 Total $ — $ 2,621 $ 185 $ 9,545
Schedule of Restructuring Reserve by Type of Cost	Restructuring liabilities are reported within accrued expenses and other long-term liabilities in the accompanying condensed consolidated balance sheets (in thousands): Severance and other related expenses Lease related impairment charges Others Total Balance at December 31, 2022 $ 792 $ — $ 149 $ 941 Charges — 2,566 55 2,621 Cash Payments (739) (1,371) (60) (2,170) Non-Cash Settlements and Other 9 (1,195) 3 (1,183) Balance at September 30, 2023 $ 62 $ — $ 147 $ 209

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Loss (Tables)	9 Months Ended
	Sep. 30, 2023
Equity [Abstract]
Schedule of Changes in Accumulated Other Comprehensive Loss	The following table sets forth the changes in accumulated other comprehensive loss by component for the nine-months ended September 30, 2023 (in thousands): Foreign Currency Translation Actuarial Gain (Loss) on Pension Total Balance at December 31, 2022 $ (49,632) $ 27,161 $ (22,471) Other comprehensive loss before reclassifications (21,936) (447) (22,383) Amounts reclassified from accumulated other comprehensive loss — (305) (305) Net current-period other comprehensive loss (21,936) (752) (22,688) Balance at September 30, 2023 $ (71,568) $ 26,409 $ (45,159)

Basic and Diluted Net Loss Pe_2

Basic and Diluted Net Loss Per Common Share (Tables)	9 Months Ended
	Sep. 30, 2023
Earnings Per Share [Abstract]
Schedule of Computation of Net Loss Per Common Share Basic and Diluted	The following table sets forth the computation of net loss per common share – basic and diluted (in thousands, except per share amounts): Three Months Ended Nine Months Ended September 30, September 24, September 30, September 24, Net loss $ (9,413) $ (11,930) $ (38,086) $ (109,501) Weighted average common shares outstanding - basic and diluted 228,077 217,620 225,465 215,104 Net loss per common share - basic and diluted $ (0.04) $ (0.05) $ (0.17) $ (0.51)
Schedule of Antidilutive Shares Excluded from Computation of Diluted Net Loss Per Share	The following sets forth the potentially dilutive shares excluded from the computation of the diluted net loss per share because their effect was anti-dilutive (in thousands): Three Months Ended Nine Months Ended September 30, September 24, September 30, September 24, Convertible senior notes 28,019 49,866 34,412 62,227 Restricted stock units 13,144 14,030 14,313 15,585 Performance stock units 3,661 2,559 3,674 2,727 Employee stock purchase plan shares — 19 71 474 Total 44,824 66,474 52,470 81,013

Debt (Tables)

Debt (Tables)	9 Months Ended
	Sep. 30, 2023
Debt Disclosure [Abstract]
Schedule of Components of Convertible Senior Notes	The following is a summary of the Company's debt as of September 30, 2023 (in millions): Net Carrying Value Unpaid Principal Balance Contractual Maturity Date Current Long-Term 2024 Notes $ 18.7 $ — $ 18.7 September 2024 2027 Notes — 196.6 200.0 March 2027 2028 Notes — 461.3 473.8 August 2028 Mortgage 6.9 — 6.9 March 2024 Total Debt $ 25.6 $ 657.9 $ 699.4 The following is a summary of the Company's debt as of December 31, 2022 (in millions): Net Carrying Value Unpaid Principal Balance Contractual Maturity Date Current Long-Term 2024 Notes $ — $ 101.7 $ 102.7 September 2024 2027 Notes — 195.9 200.0 March 2027 2028 Notes — 363.3 373.8 August 2028 Mortgage 0.5 6.8 7.3 March 2024 Total Debt $ 0.5 $ 667.7 $ 683.8 The net carrying amount of the convertible senior notes as of September 30, 2023 and as of December 31, 2022 was as follows (in thousands): 2024 Notes 2027 Notes 2028 Notes September 30, 2023 December 31, 2022 September 30, 2023 December 31, 2022 September 30, 2023 December 31, 2022 Principal $ 18,747 $ 102,652 $ 200,000 $ 200,000 $ 473,750 $ 373,750 Unamortized issuance costs and discount — (926) (3,412) (4,121) (12,402) (10,401) Net carrying amount $ 18,747 $ 101,726 $ 196,588 $ 195,879 $ 461,348 $ 363,349
Schedule of Interest Expense Recognized Related To Notes	The following table presents the interest expense related to the contractual interest coupon and the amortization of debt issuance costs on the Company's convertible senior notes (in thousands): Three Months Ended Nine Months Ended September 30, September 24, September 30, September 24, Contractual interest expense $ 5,803 $ 4,513 $ 16,472 $ 11,291 Amortization of debt issuance costs and discount 799 1,087 3,243 2,626 Total interest expense $ 6,602 $ 5,600 $ 19,715 $ 13,917

Commitments and Contingencies (

Commitments and Contingencies (Tables)	9 Months Ended
	Sep. 30, 2023
Commitments and Contingencies Disclosure [Abstract]
Schedule of Operating Lease Liabilities	The following table presents maturity of lease liabilities under the Company's non-cancelable leases as of September 30, 2023 (in thousands): Operating Lease Finance Lease Total lease payments $ 62,873 $ 5,436 Less: interest (1) 11,840 781 Present value of lease liabilities $ 51,033 $ 4,655 (1) Calculated using the interest rate for each lease. The following table sets forth commitments and contingencies related to the Company's various obligations (in thousands): Payments Due by Period Total Remainder of 2023 2024 2025 2026 2027 Thereafter Operating leases (1)(2) $ 62,873 $ 4,066 $ 15,777 $ 13,782 $ 10,437 $ 8,133 $ 10,678 Finance lease obligations (3) 5,436 249 1,296 1,119 1,003 956 813 2028 Notes, including interest (4) 562,579 — 17,766 17,766 17,766 17,766 491,515 2027 Notes, including interest (4) 217,500 — 5,000 5,000 5,000 202,500 — 2024 Notes, including interest (4) 19,145 — 19,145 — — — — Mortgage Payable, including interest (4) 7,025 196 6,829 — — — — Total contractual obligations $ 874,558 $ 4,511 $ 65,813 $ 37,667 $ 34,206 $ 229,355 $ 503,006 (1) The Company leases facilities under non-cancelable operating lease agreements. These leases have varying terms that range from one (2) The Company has contractual commitments to remove leasehold improvements and return certain properties to a specified condition when the leases terminate. At the inception of a lease with such conditions, the Company records an asset retirement obligation liability and a corresponding capital asset in an amount equal to the estimated fair value of the obligation. Asset retirement obligations were $4.6 million and $4.9 million as of September 30, 2023 and December 31, 2022, respectively. Of the $4.6 million as of September 30, 2023, $4.4 million is classified as other long-term liabilities on the accompanying condensed consolidated balance sheets. The remainder is classified as accrued expenses and other current liabilities. (3) The Company has finance leases for manufacturing and other equipment. The above payment schedule includes interest. See Note 2, "Leases" to the notes to condensed consolidated financial statements for more information. (4) See Note 10, "Debt" to the notes to condensed consolidated financial statements for more information.
Schedule of Finance Lease Liabilities	The following table presents maturity of lease liabilities under the Company's non-cancelable leases as of September 30, 2023 (in thousands): Operating Lease Finance Lease Total lease payments $ 62,873 $ 5,436 Less: interest (1) 11,840 781 Present value of lease liabilities $ 51,033 $ 4,655 (1) Calculated using the interest rate for each lease. The following table sets forth commitments and contingencies related to the Company's various obligations (in thousands): Payments Due by Period Total Remainder of 2023 2024 2025 2026 2027 Thereafter Operating leases (1)(2) $ 62,873 $ 4,066 $ 15,777 $ 13,782 $ 10,437 $ 8,133 $ 10,678 Finance lease obligations (3) 5,436 249 1,296 1,119 1,003 956 813 2028 Notes, including interest (4) 562,579 — 17,766 17,766 17,766 17,766 491,515 2027 Notes, including interest (4) 217,500 — 5,000 5,000 5,000 202,500 — 2024 Notes, including interest (4) 19,145 — 19,145 — — — — Mortgage Payable, including interest (4) 7,025 196 6,829 — — — — Total contractual obligations $ 874,558 $ 4,511 $ 65,813 $ 37,667 $ 34,206 $ 229,355 $ 503,006 (1) The Company leases facilities under non-cancelable operating lease agreements. These leases have varying terms that range from one (2) The Company has contractual commitments to remove leasehold improvements and return certain properties to a specified condition when the leases terminate. At the inception of a lease with such conditions, the Company records an asset retirement obligation liability and a corresponding capital asset in an amount equal to the estimated fair value of the obligation. Asset retirement obligations were $4.6 million and $4.9 million as of September 30, 2023 and December 31, 2022, respectively. Of the $4.6 million as of September 30, 2023, $4.4 million is classified as other long-term liabilities on the accompanying condensed consolidated balance sheets. The remainder is classified as accrued expenses and other current liabilities. (3) The Company has finance leases for manufacturing and other equipment. The above payment schedule includes interest. See Note 2, "Leases" to the notes to condensed consolidated financial statements for more information. (4) See Note 10, "Debt" to the notes to condensed consolidated financial statements for more information.
Schedule of Maturities of Long-Term Debt	The following table sets forth commitments and contingencies related to the Company's various obligations (in thousands): Payments Due by Period Total Remainder of 2023 2024 2025 2026 2027 Thereafter Operating leases (1)(2) $ 62,873 $ 4,066 $ 15,777 $ 13,782 $ 10,437 $ 8,133 $ 10,678 Finance lease obligations (3) 5,436 249 1,296 1,119 1,003 956 813 2028 Notes, including interest (4) 562,579 — 17,766 17,766 17,766 17,766 491,515 2027 Notes, including interest (4) 217,500 — 5,000 5,000 5,000 202,500 — 2024 Notes, including interest (4) 19,145 — 19,145 — — — — Mortgage Payable, including interest (4) 7,025 196 6,829 — — — — Total contractual obligations $ 874,558 $ 4,511 $ 65,813 $ 37,667 $ 34,206 $ 229,355 $ 503,006 (1) The Company leases facilities under non-cancelable operating lease agreements. These leases have varying terms that range from one (2) The Company has contractual commitments to remove leasehold improvements and return certain properties to a specified condition when the leases terminate. At the inception of a lease with such conditions, the Company records an asset retirement obligation liability and a corresponding capital asset in an amount equal to the estimated fair value of the obligation. Asset retirement obligations were $4.6 million and $4.9 million as of September 30, 2023 and December 31, 2022, respectively. Of the $4.6 million as of September 30, 2023, $4.4 million is classified as other long-term liabilities on the accompanying condensed consolidated balance sheets. The remainder is classified as accrued expenses and other current liabilities. (3) The Company has finance leases for manufacturing and other equipment. The above payment schedule includes interest. See Note 2, "Leases" to the notes to condensed consolidated financial statements for more information. (4) See Note 10, "Debt" to the notes to condensed consolidated financial statements for more information.
Schedule of Short-Term Debt	The following table sets forth commitments and contingencies related to the Company's various obligations (in thousands): Payments Due by Period Total Remainder of 2023 2024 2025 2026 2027 Thereafter Operating leases (1)(2) $ 62,873 $ 4,066 $ 15,777 $ 13,782 $ 10,437 $ 8,133 $ 10,678 Finance lease obligations (3) 5,436 249 1,296 1,119 1,003 956 813 2028 Notes, including interest (4) 562,579 — 17,766 17,766 17,766 17,766 491,515 2027 Notes, including interest (4) 217,500 — 5,000 5,000 5,000 202,500 — 2024 Notes, including interest (4) 19,145 — 19,145 — — — — Mortgage Payable, including interest (4) 7,025 196 6,829 — — — — Total contractual obligations $ 874,558 $ 4,511 $ 65,813 $ 37,667 $ 34,206 $ 229,355 $ 503,006 (1) The Company leases facilities under non-cancelable operating lease agreements. These leases have varying terms that range from one (2) The Company has contractual commitments to remove leasehold improvements and return certain properties to a specified condition when the leases terminate. At the inception of a lease with such conditions, the Company records an asset retirement obligation liability and a corresponding capital asset in an amount equal to the estimated fair value of the obligation. Asset retirement obligations were $4.6 million and $4.9 million as of September 30, 2023 and December 31, 2022, respectively. Of the $4.6 million as of September 30, 2023, $4.4 million is classified as other long-term liabilities on the accompanying condensed consolidated balance sheets. The remainder is classified as accrued expenses and other current liabilities. (3) The Company has finance leases for manufacturing and other equipment. The above payment schedule includes interest. See Note 2, "Leases" to the notes to condensed consolidated financial statements for more information. (4) See Note 10, "Debt" to the notes to condensed consolidated financial statements for more information.

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	9 Months Ended
	Sep. 30, 2023
Share-Based Payment Arrangement [Abstract]
Schedule of Company's Equity Award Activity - RSUs	(in thousands except weighted average data) Number of Weighted Aggregate Outstanding at December 31, 2022 12,588 $ 8.13 $ 84,847 RSUs granted 6,896 $ 7.01 RSUs released (5,882) $ 8.13 $ 36,871 RSUs canceled (458) $ 8.01 Outstanding at September 30, 2023 13,144 $ 7.55 54,941
Schedule of Company's Equity Award Activity - PSUs	(in thousands except weighted average data) Number of Weighted Aggregate Outstanding at December 31, 2022 2,559 $ 7.40 $ 17,251 PSUs granted 1,835 $ 7.26 PSUs canceled (733) $ 5.94 Outstanding at September 30, 2023 3,661 $ 7.63 $ 15,303
Schedule of Total Stock Based Compensation Cost for Instruments Granted but Not Yet Amortized	The following table presents total stock-based compensation cost for instruments granted but not yet fully amortized, of the Company’s equity compensation plans as of September 30, 2023. These costs are expected to be amortized on a straight-line basis over the following weighted-average periods (in thousands, except for weighted average period data): Unrecognized Weighted RSUs $ 80,160 2.02 PSUs $ 20,395 2.25
Schedule of Effects of Stock-Based Compensation on Company's Balance Sheets and Statements of Operations	The following table summarizes the stock-based compensation expense related to the ESPP, RSUs, and PSUs (in thousands): Three Months Ended Nine Months Ended September 30, September 24, September 30, September 24, ESPP $ 726 $ 1,337 $ 3,798 $ 3,713 RSUs $ 13,660 $ 14,009 $ 40,431 $ 40,006 PSUs $ 1,344 $ (1,531) $ 5,413 $ 1,005 The following tables summarize the effects of stock-based compensation on the Company’s condensed consolidated balance sheets and statements of operations for the periods presented (in thousands): September 30, December 31, Stock-based compensation effects in inventory $ 4,228 $ 3,979 Three Months Ended Nine Months Ended September 30, September 24, September 30, September 24, Income tax benefit associated with stock-based compensation $ 2,144 $ 2,296 $ 6,335 $ 7,130 Stock-based compensation effects in net loss before income taxes Cost of revenue $ 2,515 $ 2,239 $ 7,672 $ 6,722 Research and development 5,734 5,768 17,557 17,261 Sales and marketing 3,706 3,201 11,371 10,015 General and administration 3,790 2,488 12,793 10,420 Total stock-based compensation expense $ 15,745 $ 13,696 $ 49,393 $ 44,418

Segment Information (Tables)

Segment Information (Tables)	9 Months Ended
	Sep. 30, 2023
Segment Reporting [Abstract]
Schedule of Long Lived Assets	Additionally, the following table sets forth the Company's property, plant and equipment, net by geographic region (in thousands): September 30, December 31, 2022 United States $ 183,641 $ 156,065 Other Americas 2,832 2,908 Europe, Middle East and Africa 9,720 10,285 Asia Pacific 4,525 3,671 Total property, plant and equipment, net $ 200,718 $ 172,929

Guarantees (Tables)

Guarantees (Tables)	9 Months Ended
	Sep. 30, 2023
Guarantees [Abstract]
Schedule of Activity Related to Product Warranty	Activity related to product warranty was as follows (in thousands): Three Months Ended Nine Months Ended September 30, September 24, September 30, September 24, Beginning balance $ 35,397 $ 36,769 $ 36,621 $ 44,310 Charges to operations 4,998 8,603 14,830 19,831 Utilization (5,064) (4,179) (15,819) (14,910) Change in estimate (1) 527 (2,221) 226 (10,259) Balance at the end of the period $ 35,858 $ 38,972 $ 35,858 $ 38,972 (1) The Company records product warranty liabilities based on the latest quality and cost information available as of the date the revenue is recorded. The changes in estimate shown here are due to changes in overall actual failure rates, the mix of new compared to used units related to replacement of failed units, and changes in the estimated cost of repair and product recalls. As the Company's products mature over time, failure rates and repair costs associated with such products generally decline, leading to favorable changes in warranty reserves.
Schedule of Guarantor Obligations	Details are provided in the table below (in thousands). September 30, December 31, Customer performance guarantees $ 20,052 $ 20,903 Value added tax license 2,827 1,434 Property leases 1,928 2,398 Total $ 24,807 $ 24,735

Pension and Post-Retirement B_2

Pension and Post-Retirement Benefit Plans (Tables)	9 Months Ended
	Sep. 30, 2023
Retirement Benefits [Abstract]
Schedule of Net Benefit Costs	Net periodic benefit cost for the Company's pension and other post-retirement benefit plans consisted of the following (in thousands): Three Months Ended Nine Months Ended September 30, September 24, September 30, September 24, Service cost $ 38 $ 71 $ 189 $ 227 Interest cost 775 297 2,325 944 Expected return on plan assets (659) (697) (1,977) (2,216) Amortization of actuarial (gain) loss (108) 77 (305) 246 Total net periodic benefit cost $ 46 $ (252) $ 232 $ (799)

Basis of Presentation and Sig_3

Basis of Presentation and Significant Accounting Policies (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 24, 2022	Sep. 30, 2023
Customer One | Revenue from Contract with Customer Benchmark | Customer Concentration Risk
Product Information [Line Items]
Concentration risk, percentage	12%	12%	11%

Leases - Narrative (Details)

Leases - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 24, 2022	Sep. 30, 2023	Sep. 24, 2022	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Operating lease expense	$ 3.4	$ 4.2	$ 11.6	$ 17.5
Accelerated rent expense	0.4	$ 1.1	2.6	$ 7.5
Finance lease, right-of-use asset	$ 5.6		$ 5.6		$ 1.9
Minimum
Property, Plant and Equipment [Line Items]
Term of finance lease	3 years		3 years
Maximum
Property, Plant and Equipment [Line Items]
Term of finance lease	5 years		5 years

Leases - Schedule of Current an

Leases - Schedule of Current and Long-Term Portion of Operating Lease Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Leases [Abstract]
Accrued expenses and other current liabilities	$ 11,875	$ 10,948
Other long-term liabilities	39,158	45,862
Total operating lease liability	$ 51,033	$ 56,810
Finance lease, liability, current, statement of financial position [Extensible Enumeration]	Accrued expenses and other current liabilities	Accrued expenses and other current liabilities
Finance lease, liability, statement of financial position [Extensible List]	Other long-term liabilities	Other long-term liabilities

Leases - Schedule of Operating

Leases - Schedule of Operating Lease and Finance Lease Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Operating Lease
Total lease payments	$ 62,873
Less: interest	11,840
Present value of lease liabilities	51,033	$ 56,810
Finance Lease
Total lease payments	5,436
Less: interest	781
Present value of lease liabilities	$ 4,655

Leases - Schedule of Lease Cost

Leases - Schedule of Lease Costs (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2023 USD ($)
Operating Lease
Weighted average remaining lease term	4 years 9 months 14 days
Weighted average discount rate	9.32%
Cash paid for amounts included in the measurement of lease liabilities	$ 12,261
Leased assets obtained in exchange for new lease liabilities	$ 3,104
Finance Lease
Weighted average remaining lease term	4 years 2 months 26 days
Weighted average discount rate	9.88%
Cash paid for amounts included in the measurement of lease liabilities	$ 784
Leased assets obtained in exchange for new lease liabilities	$ 4,363

Revenue Recognition - Schedule

Revenue Recognition - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 24, 2022	Sep. 30, 2023	Sep. 24, 2022
Disaggregation of Revenue [Line Items]
Total revenue	$ 392,369	$ 390,447	$ 1,160,672	$ 1,087,306
Direct
Disaggregation of Revenue [Line Items]
Total revenue	264,076	287,055	768,456	821,666
Indirect
Disaggregation of Revenue [Line Items]
Total revenue	128,293	103,392	392,216	265,640
United States
Disaggregation of Revenue [Line Items]
Total revenue	229,649	222,071	683,798	573,786
Other Americas
Disaggregation of Revenue [Line Items]
Total revenue	25,361	21,496	69,073	75,232
Europe, Middle East and Africa
Disaggregation of Revenue [Line Items]
Total revenue	99,261	94,181	278,154	306,630
Asia Pacific
Disaggregation of Revenue [Line Items]
Total revenue	$ 38,098	$ 52,699	$ 129,647	$ 131,658

Revenue Recognition - Schedul_2

Revenue Recognition - Schedule of Contract with Customer, Asset and Liability (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Revenue from Contract with Customer [Abstract]
Accounts receivable, net	$ 328,863	$ 419,735
Contract assets	37,407	60,172
Deferred revenue	$ (121,950)	$ (181,679)

Revenue Recognition - Narrative

Revenue Recognition - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 24, 2022	Sep. 30, 2023	Sep. 24, 2022
Revenue from Contract with Customer [Abstract]
Deferred revenue recognized	$ 17.4	$ 21.5	$ 112.7	$ 92

Revenue Recognition - Schedul_3

Revenue Recognition - Schedule of Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction (Details) $ in Thousands	Sep. 30, 2023 USD ($)
Disaggregation of Revenue [Line Items]
Revenue expected to be recognized in the future as of September 30, 2023	$ 516,053
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-10-01
Disaggregation of Revenue [Line Items]
Revenue expected to be recognized in the future as of September 30, 2023	$ 347,267
Revenue expected to be recognized in the future, period	3 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Disaggregation of Revenue [Line Items]
Revenue expected to be recognized in the future as of September 30, 2023	$ 132,403
Revenue expected to be recognized in the future, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Disaggregation of Revenue [Line Items]
Revenue expected to be recognized in the future as of September 30, 2023	$ 18,163
Revenue expected to be recognized in the future, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Disaggregation of Revenue [Line Items]
Revenue expected to be recognized in the future as of September 30, 2023	$ 8,660
Revenue expected to be recognized in the future, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01
Disaggregation of Revenue [Line Items]
Revenue expected to be recognized in the future as of September 30, 2023	$ 6,182
Revenue expected to be recognized in the future, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-01-01
Disaggregation of Revenue [Line Items]
Revenue expected to be recognized in the future as of September 30, 2023	$ 3,378
Revenue expected to be recognized in the future, period

Fair Value Measurements - Sched

Fair Value Measurements - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - Fair Value, Recurring - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Money Market Funds
Assets (Liabilities)
Money market funds	$ 70,000	$ 95,000
Level 1 | Money Market Funds
Assets (Liabilities)
Money market funds	70,000	95,000
Level 2 | Money Market Funds
Assets (Liabilities)
Money market funds	0	0
Convertible senior notes
Assets (Liabilities)
Convertible senior notes	630,605	785,364
Convertible senior notes | Level 1
Assets (Liabilities)
Convertible senior notes	0	0
Convertible senior notes | Level 2
Assets (Liabilities)
Convertible senior notes	$ 630,605	$ 785,364

Fair Value Measurements - Narra

Fair Value Measurements - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended
	Sep. 30, 2023		Sep. 24, 2022		Sep. 30, 2023		Sep. 24, 2022		Dec. 31, 2022	Dec. 25, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Accelerated rent expense	$ 400		$ 1,100		$ 2,600		$ 7,500
Cash, cash equivalents and restricted cash	126,636	[1]	$ 210,017	[1]	126,636	[1]	$ 210,017	[1]	$ 189,203	$ 202,521
Foreign Subsidiary
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash, cash equivalents and restricted cash	$ 47,000				$ 47,000				$ 65,900
[1]Reconciliation of cash, cash equivalents and restricted cash to the condensed consolidated balance sheets: September 30, September 24, Cash and cash equivalents $ 123,927 $ 198,044 Short-term restricted cash 1,725 8,946 Long-term restricted cash 984 3,027 Total cash, cash equivalents and restricted cash $ 126,636 $ 210,017

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets - Schedule of Goodwill (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2023 USD ($)
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 232,663
Foreign currency translation adjustments	(7,444)
Goodwill, ending balance	$ 225,219

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets - Schedule of Finite-Lived Intangible Assets (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Intangible assets with finite lives:
Gross Carrying Amount	$ 259,051	$ 321,928
Accumulated Amortization	(231,976)	(274,141)
Net Carrying Amount	27,075	47,787
Customer relationships and backlog
Intangible assets with finite lives:
Gross Carrying Amount	110,318	151,461
Accumulated Amortization	(83,243)	(114,294)
Net Carrying Amount	$ 27,075	$ 37,167
Weighted Average Remaining Useful Life (In Years)	3 years	3 years 6 months
Developed technology
Intangible assets with finite lives:
Gross Carrying Amount	$ 148,733	$ 170,467
Accumulated Amortization	(148,733)	(159,847)
Net Carrying Amount	$ 0	$ 10,620
Weighted Average Remaining Useful Life (In Years)		8 months 12 days

Goodwill and Intangible Asset_4

Goodwill and Intangible Assets - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 24, 2022	Sep. 30, 2023	Sep. 24, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense	$ 6.5	$ 9.8	$ 20.7	$ 29.7

Goodwill and Intangible Asset_5

Goodwill and Intangible Assets - Schedule of Finite-Lived Intangible Assets, Future Amortization Expense (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Net Carrying Amount	$ 27,075	$ 47,787
Remainder of 2023	2,256
2024	9,025
2025	9,025
2026	6,769
2027	0
Thereafter	$ 0

Balance Sheet Details - Schedul

Balance Sheet Details - Schedule of Allowance for Credit Losses (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2023 USD ($)
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 1,422
Additions	267
Write offs	(390)
Recoveries during the period	(333)
Ending balance	$ 966

Balance Sheet Details - Narrati

Balance Sheet Details - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 24, 2022	Sep. 30, 2023	Sep. 24, 2022
Property, Plant and Equipment [Line Items]
Interest expense	$ 7,608	$ 6,516	$ 21,795	$ 18,760
Trade Accounts Receivable
Property, Plant and Equipment [Line Items]
Interest expense	300	200	700	400
Receivables sold	$ 18,100	$ 25,000	$ 52,500	$ 67,600

Balance Sheet Details - Sched_2

Balance Sheet Details - Schedule of Selected Balance Sheet Items (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 24, 2022	Sep. 30, 2023	Sep. 24, 2022	Dec. 31, 2022
Inventory
Raw materials	$ 110,353		$ 110,353		$ 48,688
Work in process	69,916		69,916		66,591
Finished goods	276,611		276,611		259,576
Total inventory	456,880		456,880		374,855
Property, plant and equipment, net
Subtotal	572,460		572,460		513,792
Less accumulated depreciation and amortization	(371,742)		(371,742)		(340,863)
Total property, plant and equipment, net	200,718		200,718		172,929
Accrued expenses and other current liabilities
Loss contingency related to non-cancelable purchase commitments	16,789		16,789		28,796
Taxes payable	40,251		40,251		42,757
Short-term operating and finance lease liability	13,002		13,002		11,701
Restructuring accrual	209		209		941
Other accrued expenses and other current liabilities	40,037		40,037		57,255
Total accrued expenses	110,288		110,288		141,450
Depreciation	13,500	$ 11,500	38,700	$ 34,300
License Agreement Terms
Accrued expenses and other current liabilities
Depreciation	2,400	2,000	6,800	5,500
Computer hardware
Property, plant and equipment, net
Subtotal	48,024		48,024		46,454
Computer software
Property, plant and equipment, net
Subtotal	76,973		76,973		62,102
Laboratory and manufacturing equipment
Property, plant and equipment, net
Subtotal	345,384		345,384		297,261
Land and building
Property, plant and equipment, net
Subtotal	12,372		12,372		12,369
Furniture and fixtures
Property, plant and equipment, net
Subtotal	2,843		2,843		2,828
Leasehold and building improvements
Property, plant and equipment, net
Subtotal	50,985		50,985		50,360
Construction in progress
Property, plant and equipment, net
Subtotal	35,879		35,879		42,418
Enterprise Resource Planning Systems
Property, plant and equipment, net
Subtotal	34,700		34,700		29,300
Total property, plant and equipment, net	10,800		10,800		9,000
Accrued expenses and other current liabilities
Depreciation	1,300	$ 1,100	3,500	$ 2,600
Enterprise Resource Planning Systems | License
Property, plant and equipment, net
Subtotal	32,400		32,400		24,200
Total property, plant and equipment, net	$ 17,300		$ 17,300		$ 9,100

Restructuring and Other Relat_3

Restructuring and Other Related Costs - Schedule of Restructuring and Other Related Costs (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 24, 2022	Sep. 30, 2023	Sep. 24, 2022
Restructuring Cost and Reserve [Line Items]
Restructuring and other related costs			$ 2,621
Cost of Revenue
Restructuring Cost and Reserve [Line Items]
Restructuring and other related costs	$ 0	$ 22	0	$ 185
Operating Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring and other related costs	400	1,142	2,621	9,545
Severance and other related expenses
Restructuring Cost and Reserve [Line Items]
Restructuring and other related costs			0
Severance and other related expenses | Cost of Revenue
Restructuring Cost and Reserve [Line Items]
Restructuring and other related costs	0	22	0	166
Severance and other related expenses | Operating Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring and other related costs	0	32	0	1,789
Lease related impairment charges
Restructuring Cost and Reserve [Line Items]
Restructuring and other related costs			2,566
Lease related impairment charges | Cost of Revenue
Restructuring Cost and Reserve [Line Items]
Restructuring and other related costs	0	0	0	0
Lease related impairment charges | Operating Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring and other related costs	405	1,076	2,566	7,535
Others
Restructuring Cost and Reserve [Line Items]
Restructuring and other related costs			55
Others | Cost of Revenue
Restructuring Cost and Reserve [Line Items]
Restructuring and other related costs	0	0	0	19
Others | Operating Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring and other related costs	$ (5)	$ 34	$ 55	$ 221

Restructuring and Other Relat_4

Restructuring and Other Related Costs - Schedule of Restructuring Reserve by Type of Cost (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2023 USD ($)
Restructuring Reserve [Roll Forward]
Beginning balance	$ 941
Charges	2,621
Cash Payments	(2,170)
Non-Cash Settlements and Other	(1,183)
Ending balance	209
Severance and other related expenses
Restructuring Reserve [Roll Forward]
Beginning balance	792
Charges	0
Cash Payments	(739)
Non-Cash Settlements and Other	9
Ending balance	62
Lease related impairment charges
Restructuring Reserve [Roll Forward]
Beginning balance	0
Charges	2,566
Cash Payments	(1,371)
Non-Cash Settlements and Other	(1,195)
Ending balance	0
Others
Restructuring Reserve [Roll Forward]
Beginning balance	149
Charges	55
Cash Payments	(60)
Non-Cash Settlements and Other	3
Ending balance	$ 147

Restructuring and Other Relat_5

Restructuring and Other Related Costs - Narrative (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Restructuring Cost and Reserve [Line Items]
Restructuring liability	$ 209	$ 941
2021 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring liability	$ 200

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 24, 2022	Sep. 30, 2023	Sep. 24, 2022
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ 167,178	$ 116,558	$ 179,647	$ 323,771
Other comprehensive loss before reclassifications			(22,383)
Amounts reclassified from accumulated other comprehensive loss			(305)
Net change in accumulated other comprehensive loss	2,100	(9,596)	(22,688)	(34,637)
Ending balance	181,229	114,201	181,229	114,201
Total
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(47,259)	(29,537)	(22,471)	(4,496)
Net change in accumulated other comprehensive loss	2,100	(9,596)	(22,688)	(34,637)
Ending balance	(45,159)	$ (39,133)	(45,159)	$ (39,133)
Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance			(49,632)
Other comprehensive loss before reclassifications			(21,936)
Amounts reclassified from accumulated other comprehensive loss			0
Net change in accumulated other comprehensive loss			(21,936)
Ending balance	(71,568)		(71,568)
Actuarial Gain (Loss) on Pension
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance			27,161
Other comprehensive loss before reclassifications			(447)
Amounts reclassified from accumulated other comprehensive loss			(305)
Net change in accumulated other comprehensive loss			(752)
Ending balance	$ 26,409		$ 26,409

Basic and Diluted Net Loss Pe_3

Basic and Diluted Net Loss Per Common Share - Schedule of Computation of Net Loss Per Common Share Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 24, 2022	Sep. 30, 2023	Sep. 24, 2022
Earnings Per Share [Abstract]
Net loss	$ (9,413)	$ (11,930)	$ (38,086)	$ (109,501)
Weighted average common shares outstanding - basic (in shares)	228,077	217,620	225,465	215,104
Weighted average common shares outstanding - diluted (in shares)	228,077	217,620	225,465	215,104
Net loss per common share - basic (in dollars per share)	$ (0.04)	$ (0.05)	$ (0.17)	$ (0.51)
Net loss per common share - diluted (in dollars per share)	$ (0.04)	$ (0.05)	$ (0.17)	$ (0.51)

Basic and Diluted Net Loss Pe_4

Basic and Diluted Net Loss Per Common Share - Schedule of Antidilutive Shares Excluded from Computation of Diluted Net Loss Per Share (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 24, 2022	Sep. 30, 2023	Sep. 24, 2022
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from earnings per share computation (in shares)	44,824	66,474	52,470	81,013
Convertible senior notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from earnings per share computation (in shares)	28,019	49,866	34,412	62,227
Restricted stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from earnings per share computation (in shares)	13,144	14,030	14,313	15,585
Performance stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from earnings per share computation (in shares)	3,661	2,559	3,674	2,727
Employee stock purchase plan shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from earnings per share computation (in shares)	0	19	71	474

Debt - Schedule of Components o

Debt - Schedule of Components of Convertible Senior Notes (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Current	$ 25,600	$ 500
Long-Term	657,936	667,719
Unpaid Principal Balance	699,400	683,800
Mortgage
Debt Instrument [Line Items]
Current	6,900	500
Long-Term	0	6,800
Unpaid Principal Balance	6,900	7,300
2024 Notes
Debt Instrument [Line Items]
Long-Term	18,747	101,726
2024 Notes | Convertible senior notes
Debt Instrument [Line Items]
Current	18,700	0
Long-Term	0	101,700
Unpaid Principal Balance	18,700	102,700
2027 Notes
Debt Instrument [Line Items]
Long-Term	196,588	195,879
2027 Notes | Convertible senior notes
Debt Instrument [Line Items]
Current	0	0
Long-Term	196,600	195,900
Unpaid Principal Balance	200,000	200,000
2028 Notes
Debt Instrument [Line Items]
Long-Term	461,348	363,349
2028 Notes | Convertible senior notes
Debt Instrument [Line Items]
Current	0	0
Long-Term	461,300	363,300
Unpaid Principal Balance	$ 473,800	$ 373,800

Debt - Narrative (Details)

Debt - Narrative (Details)						1 Months Ended
	Aug. 08, 2022 USD ($)	Jun. 24, 2022 USD ($)	Dec. 26, 2021	Sep. 24, 2021 USD ($) installment	Mar. 31, 2020 USD ($)	Jun. 30, 2023 USD ($)	Mar. 31, 2019 USD ($) installment	Sep. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)	Aug. 31, 2022 USD ($)	Sep. 30, 2018 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current maturities								$ 25,600,000	$ 500,000
Letter of Credit | Banker's Guarantees or Performance Bonds
Accounts, Notes, Loans and Financing Receivable [Line Items]
Long-term line of credit								23,200,000
Letters of credit outstanding								23,200,000
2024 Notes
Accounts, Notes, Loans and Financing Receivable [Line Items]
Debt instrument, face amount								18,747,000	102,652,000
2027 Notes
Accounts, Notes, Loans and Financing Receivable [Line Items]
Debt instrument, face amount								200,000,000	200,000,000
2028 Notes
Accounts, Notes, Loans and Financing Receivable [Line Items]
Debt instrument, face amount								473,750,000	373,750,000
Senior Notes | 2024 Notes
Accounts, Notes, Loans and Financing Receivable [Line Items]
Debt instrument, face amount											$ 402,500,000
Contractual Interest Rates											2.125%
Payment for debt extinguishment						$ 84,000,000
Extinguishment of debt						83,900,000
Additional effective rate of interest to be used on amortized carrying value			2.60%
Debt issuance costs amortization period			11 months
Senior Notes | 2027 Notes
Accounts, Notes, Loans and Financing Receivable [Line Items]
Debt instrument, face amount					$ 200,000,000
Contractual Interest Rates					2.50%
Additional effective rate of interest to be used on amortized carrying value					3%
Debt issuance costs amortization period					41 months
Senior Notes | 2028 Notes
Accounts, Notes, Loans and Financing Receivable [Line Items]
Debt instrument, face amount	$ 373,800,000					$ 100,000,000				$ 373,800,000
Contractual Interest Rates						3.75%				3.75%
Proceeds from issuance of long term debt						$ 96,500,000
Additional effective rate of interest to be used on amortized carrying value	4.30%
Debt issuance costs amortization period	58 months
Asset-based revolving credit facility | Credit Agreement | Revolving Credit Facility
Accounts, Notes, Loans and Financing Receivable [Line Items]
Maximum borrowing capacity		$ 200,000,000
Additional borrowing capacity		$ 100,000,000
Commitment fee percentage		0.25%
Debt available borrowing capacity								158,800,000
Asset-based revolving credit facility | Credit Agreement | Revolving Credit Facility | SOFR | Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Variable rate		1.25%
Asset-based revolving credit facility | Credit Agreement | Revolving Credit Facility | SOFR | Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Variable rate		1.75%
Asset-based revolving credit facility | Credit Agreement | Revolving Credit Facility | Base Rate | Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Variable rate		0.25%
Asset-based revolving credit facility | Credit Agreement | Revolving Credit Facility | Base Rate | Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Variable rate		0.75%
Asset-based revolving credit facility | Credit Agreement | Letter of Credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Maximum borrowing capacity		$ 50,000,000						50,000,000
Asset-based revolving credit facility | Credit Agreement | Swing Loan Sub-Facility
Accounts, Notes, Loans and Financing Receivable [Line Items]
Maximum borrowing capacity		$ 20,000,000
Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contractual Interest Rates				3.80%			5.25%
Proceeds from debt							$ 8,700,000
Debt payment installments | installment				31			59
Debt term							5 years
Debt payment				$ 100,000
Current maturities								$ 6,900,000	$ 500,000

Debt - Schedule of Interest Exp

Debt - Schedule of Interest Expense Recognized Related to Notes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 24, 2022	Sep. 30, 2023	Sep. 24, 2022
Debt Instrument [Line Items]
Amortization of debt issuance costs and discount			$ 2,970	$ 5,270
2024 Notes
Debt Instrument [Line Items]
Contractual interest expense	$ 5,803	$ 4,513	16,472	11,291
Amortization of debt issuance costs and discount	799	1,087	3,243	2,626
Total interest expense	$ 6,602	$ 5,600	$ 19,715	$ 13,917

Debt - Schedule of Net Carrying

Debt - Schedule of Net Carrying Amount (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net carrying amount	$ 657,936	$ 667,719
2024 Notes
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal	18,747	102,652
Unamortized issuance costs and discount	0	(926)
Net carrying amount	18,747	101,726
2027 Notes
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal	200,000	200,000
Unamortized issuance costs and discount	(3,412)	(4,121)
Net carrying amount	196,588	195,879
2028 Notes
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal	473,750	373,750
Unamortized issuance costs and discount	(12,402)	(10,401)
Net carrying amount	$ 461,348	$ 363,349

Commitments and Contingencies -

Commitments and Contingencies - Schedule of Operating Lease Liabilities (Details) $ in Thousands	Sep. 30, 2023 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Total lease payments	$ 62,873
Remainder of 2023	4,066
2024	15,777
2025	13,782
2026	10,437
2027	8,133
Thereafter	$ 10,678

Commitments and Contingencies_2

Commitments and Contingencies - Schedule of Finance Lease Liabilities (Details) $ in Thousands	Sep. 30, 2023 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Total lease payments	$ 5,436
Remainder of 2023	249
2024	1,296
2025	1,119
2026	1,003
2027	956
Thereafter	$ 813

Commitments and Contingencies_3

Commitments and Contingencies - Schedule of Maturities of Long-Term Debt (Details) $ in Thousands	Sep. 30, 2023 USD ($)
Mortgage Payable, including interest
Debt Instrument [Line Items]
Total	$ 7,025
Remainder of 2023	196
2024	6,829
2025	0
2026	0
2027	0
Thereafter	0
2028 Notes, including interest | Senior Notes
Debt Instrument [Line Items]
Total	562,579
Remainder of 2023	0
2024	17,766
2025	17,766
2026	17,766
2027	17,766
Thereafter	491,515
2027 Notes, including interest | Senior Notes
Debt Instrument [Line Items]
Total	217,500
Remainder of 2023	0
2024	5,000
2025	5,000
2026	5,000
2027	202,500
Thereafter	0
2024 Notes, including interest | Senior Notes
Debt Instrument [Line Items]
Total	19,145
Remainder of 2023	0
2024	19,145
2025	0
2026	0
2027	0
Thereafter	$ 0

Commitments and Contingencies_4

Commitments and Contingencies - Schedule of Short-Term Debt (Details) $ in Thousands	Sep. 30, 2023 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Total contractual obligations	$ 874,558
Remainder of 2023	4,511
2024	65,813
2025	37,667
2026	34,206
2027	229,355
Thereafter	$ 503,006

Commitments and Contingencies_5

Commitments and Contingencies - Narrative (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Loss Contingencies [Line Items]
Asset retirement obligation	$ 4.6	$ 4.9
Other Long Term Liabilities
Loss Contingencies [Line Items]
Asset retirement obligation	$ 4.4
Minimum
Loss Contingencies [Line Items]
Operating lease term	1 year
Maximum
Loss Contingencies [Line Items]
Operating lease term	11 years

Stockholders' Equity - Narrativ

Stockholders' Equity - Narrative (Details) - $ / shares shares in Millions	1 Months Ended
	May 31, 2023	Sep. 30, 2023	Sep. 29, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Closing price of common stock (in dollars per share)			$ 4.18
2016 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of additional shares authorized (in shares)	8.1
Reserved common stock for issuance of options (in shares)		51.8

Stockholders' Equity - Schedule

Stockholders' Equity - Schedule of Company's Equity Award Activity - RSUs (Details) - Restricted Stock Units $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended
	Sep. 30, 2023 USD ($) $ / shares shares
Number of Restricted Stock Units
Number of units, beginning balance (in shares) | shares	12,588
Number of units granted (in shares) | shares	6,896
Number of units released (in shares) | shares	(5,882)
Number of units canceled (in shares) | shares	(458)
Number of units, ending balance (in shares) | shares	13,144
Weighted Average  Grant Date  Fair Value Per Share
Weighted average grant date fair value per share, beginning balance (in dollars per share) | $ / shares	$ 8.13
Weighted average grant date fair value per share, granted (in dollars per share) | $ / shares	7.01
Weighted average grant date fair value per share, released (in dollars per share) | $ / shares	8.13
Weighted average grant date fair value per share, canceled (in dollars per share) | $ / shares	8.01
Weighted average grant date fair value per share, ending balance (in dollars per share) | $ / shares	$ 7.55
Aggregate Intrinsic Value
Aggregate intrinsic value, beginning balance | $	$ 84,847
Aggregate intrinsic value, RSUs released | $	36,871
Aggregate intrinsic value, ending balance | $	$ 54,941

Stockholders' Equity - Schedu_2

Stockholders' Equity - Schedule of Company's Equity Award Activity - PSUs (Details) - Performance stock units $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended
	Sep. 30, 2023 USD ($) $ / shares shares
Number of Performance Stock Units
Number of units, beginning balance (in shares) | shares	2,559
Number of units granted (in shares) | shares	1,835
Number of units canceled (in shares) | shares	(733)
Number of units, ending balance (in shares) | shares	3,661
Weighted Average  Grant Date  Fair Value Per Share
Weighted average grant date fair value per share, beginning balance (in dollars per share) | $ / shares	$ 7.40
Weighted average grant date fair value per share, granted (in dollars per share) | $ / shares	7.26
Weighted average grant date fair value per share, canceled (in dollars per share) | $ / shares	5.94
Weighted average grant date fair value per share, ending balance (in dollars per share) | $ / shares	$ 7.63
Aggregate Intrinsic Value
Aggregate intrinsic value, beginning balance | $	$ 17,251
Aggregate intrinsic value, ending balance | $	$ 15,303

Stockholders' Equity - Schedu_3

Stockholders' Equity - Schedule of Total Stock Based Compensation Cost for Instruments Granted but Not Yet Amortized (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2023 USD ($)
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Compensation Expense, Net	$ 80,160
Weighted Average Period (in Years)	2 years 7 days
PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Compensation Expense, Net	$ 20,395
Weighted Average Period (in Years)	2 years 3 months

Stockholders' Equity - Schedu_4

Stockholders' Equity - Schedule of Stock-Based Compensation Expense Related to ESPP, Amortization of Stock-Based Compensation Related to RSUs, and Stock-Based Compensation Expense Related to PSUs (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 24, 2022	Sep. 30, 2023	Sep. 24, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense	$ 15,745	$ 13,696	$ 49,393	$ 44,418
Employee stock purchase plan shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense	726	1,337	3,798	3,713
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense	13,660	14,009	40,431	40,006
Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense	$ 1,344	$ (1,531)	$ 5,413	$ 1,005

Stockholders' Equity - Schedu_5

Stockholders' Equity - Schedule of Effects of Stock-Based Compensation on Company's Balance Sheets and Statements of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 24, 2022	Sep. 30, 2023	Sep. 24, 2022	Dec. 31, 2022
Effects Of Stock Based Compensation [Line Items]
Income tax benefit associated with stock-based compensation	$ 2,144	$ 2,296	$ 6,335	$ 7,130
Total stock-based compensation expense	15,745	13,696	49,393	44,418
Cost of revenue
Effects Of Stock Based Compensation [Line Items]
Stock-based compensation effects in net loss before income taxes	2,515	2,239	7,672	6,722
Research and development
Effects Of Stock Based Compensation [Line Items]
Stock-based compensation effects in net loss before income taxes	5,734	5,768	17,557	17,261
Sales and marketing
Effects Of Stock Based Compensation [Line Items]
Stock-based compensation effects in net loss before income taxes	3,706	3,201	11,371	10,015
General and administration
Effects Of Stock Based Compensation [Line Items]
Stock-based compensation effects in net loss before income taxes	3,790	$ 2,488	12,793	$ 10,420
Inventory Valuation and Obsolescence
Effects Of Stock Based Compensation [Line Items]
Stock-based compensation effects in inventory	$ 4,228		$ 4,228		$ 3,979

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 24, 2022	Sep. 30, 2023	Sep. 24, 2022
Income Tax Disclosure [Abstract]
Tax expense	$ 2,466	$ 4,792	$ 12,510	$ 16,568
Pre-tax loss	(6,947)	$ (7,138)	(25,576)	$ (92,933)
Provision for income taxes increase (decrease)	$ (2,300)		$ (4,100)

Segment Information (Details)

Segment Information (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2023 USD ($) segment	Dec. 31, 2022 USD ($)
Segment Reporting [Abstract]
Number of business activities | segment	1
Number of reporting segments | segment	1
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property, plant and equipment, net	$ 200,718	$ 172,929
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property, plant and equipment, net	183,641	156,065
Other Americas
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property, plant and equipment, net	2,832	2,908
Europe, Middle East and Africa
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property, plant and equipment, net	9,720	10,285
Asia Pacific
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property, plant and equipment, net	$ 4,525	$ 3,671

Guarantees - Schedule of Activi

Guarantees - Schedule of Activity Related to Product Warranty (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 24, 2022	Sep. 30, 2023	Sep. 24, 2022
Movement in Standard Product Warranty Accrual [Roll Forward]
Beginning balance	$ 35,397	$ 36,769	$ 36,621	$ 44,310
Charges to operations	4,998	8,603	14,830	19,831
Utilization	(5,064)	(4,179)	(15,819)	(14,910)
Change in estimate	527	(2,221)	226	(10,259)
Balance at the end of the period	$ 35,858	$ 38,972	$ 35,858	$ 38,972

Guarantees - Narrative (Details

Guarantees - Narrative (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Guarantor Obligations [Line Items]
Outstanding standby letters of credit	$ 24,807	$ 24,735
Bond secure amount	4,000	4,000
Surety Bond
Guarantor Obligations [Line Items]
Bond secure amount	7,500	7,500
Letter of Credit
Guarantor Obligations [Line Items]
Customer performance guarantees	20,052	$ 20,903
Cash collateral	$ 1,900

Guarantees - Schedule of Guaran

Guarantees - Schedule of Guarantor Obligations (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Guarantor Obligations [Line Items]
Total	$ 24,807	$ 24,735
Letter of Credit
Guarantor Obligations [Line Items]
Customer performance guarantees	20,052	20,903
Value added tax license	2,827	1,434
Property leases	$ 1,928	$ 2,398

Pension and Post-Retirement B_3

Pension and Post-Retirement Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 24, 2022	Sep. 30, 2023	Sep. 24, 2022
Retirement Benefits [Abstract]
Service cost	$ 38	$ 71	$ 189	$ 227
Interest cost	775	297	2,325	944
Expected return on plan assets	(659)	(697)	(1,977)	(2,216)
Amortization of actuarial (gain) loss	(108)	77	(305)	246
Total net periodic benefit cost	$ 46	$ (252)	$ 232	$ (799)

Uncategorized Items - infn-2023

Label	Element	Value
Accounting Standards Update [Extensible Enumeration]	us-gaap_AccountingStandardsUpdateExtensibleList	Accounting Standards Update 2020-06 [Member]