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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2023
Sep. 24, 2022
Cash flows from operating activities:    
Net income $ 6,541 $ 64,465
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 22,880 21,189
Amortization 6,043 7,056
Reduction in the carrying amount of right-of-use assets 5,556 5,900
Stock-based compensation expense 29,333 21,873
Deferred income tax benefit (6,283) (6,881)
Provision for excess and obsolete inventories 12,566 16,078
Other adjustments to reconcile net income to net cash provided by operating activities 1,375 4,066
Changes in assets and liabilities:    
Accounts receivable (7,796) 1,654
Inventories (8,910) (33,023)
Prepaid expenses and other current assets (1,761) (2,016)
Other assets 804 (117)
Accounts payable 474 17,613
Accrued liabilities (5,268) (5,035)
Other liabilities 467 276
Deferred revenues (12,915) 3,776
Deferred grant 18,000  
Operating lease liabilities (5,754) (5,826)
Net cash provided by operating activities 55,352 111,048
Cash flows from investing activities:    
Acquisition of property, plant and equipment (46,094) (39,024)
Acquisition of business 0 3,350
Purchases of marketable securities (96,913) (80,249)
Purchase of promissory note receivable 0 (1,000)
Proceeds from maturities and sales of marketable securities 93,013 71,610
Net cash used in investing activities (49,994) (52,013)
Cash flows from financing activities:    
Proceeds from issuances of common stock 8,822 10,499
Purchase of common stock through stock repurchase program 0 (73,478)
Tax withholdings related to net share settlements of equity awards (9,349) (15,564)
Principal repayments on term loans (781) (6,421)
Net cash used in financing activities (1,308) (84,964)
Effect of exchange rate changes on cash, cash equivalents and restricted cash (3,324) (5,708)
Net increase (decrease) in cash, cash equivalents and restricted cash 726 (31,637)
Cash, cash equivalents and restricted cash, beginning of period 112,982 155,342
Cash, cash equivalents and restricted cash, end of period 113,708 123,705
Non-cash investing and financing activities:    
Increase (decrease) in accounts payable and accrued liabilities related to property, plant and equipment purchases (6,222) 341
Operating lease, right-of-use assets obtained in exchange for lease obligations 4,728 3,457
Supplemental disclosure of cash flow information:    
Cash paid for income taxes, net 12,064 9,911
Cash paid for interest 317 455
Operating cash outflows from operating leases 6,836 6,670
Reconciliation of cash, cash equivalents and restricted cash:    
Cash and cash equivalents 108,731 120,602
Restricted cash, current 1,171 1,263
Restricted cash, non-current 2,146 1,840
Cash and cash equivalents included in Assets held-for-sale 1,660 0
Total cash, cash equivalents and restricted cash $ 113,708 $ 123,705