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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jul. 01, 2023
Jun. 25, 2022
Cash flows from operating activities:    
Net income $ 2,170 $ 60,114
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 15,121 14,146
Amortization 4,766 4,702
Reduction in the carrying amount of right-of-use assets 3,914 4,414
Stock-based compensation expense 18,494 13,878
Deferred income tax benefit (3,639) (3,703)
Provision for excess and obsolete inventories 8,628 4,726
Other adjustments to reconcile net income to net cash provided by operating activities 1,801 3,846
Changes in assets and liabilities:    
Accounts receivable (6,830) 5,530
Inventories (5,880) (32,268)
Prepaid expenses and other current assets (1,099) 1,295
Other assets (83) (40)
Accounts payable 3,578 7,521
Accrued liabilities (10,606) 4,102
Other liabilities 456 73
Deferred revenues (9,945) 2,727
Deferred grant 18,000  
Operating lease liabilities (4,065) (4,262)
Net cash provided by operating activities 34,781 86,801
Cash flows from investing activities:    
Acquisition of property, plant and equipment (40,177) (30,116)
Acquisition of business 0 3,121
Purchases of marketable securities (66,650) (52,344)
Purchase of promissory note receivable 0 (1,000)
Proceeds from maturities and sales of marketable securities 58,363 45,470
Net cash used in investing activities (48,464) (41,111)
Cash flows from financing activities:    
Proceeds from issuances of common stock 5,024 5,687
Purchase of common stock through stock repurchase program 0 (54,328)
Tax withholdings related to net share settlements of equity awards (456) (4,243)
Principal repayments on term loans (519) (4,379)
Net cash provided by (used in) financing activities 4,049 (57,263)
Effect of exchange rate changes on cash, cash equivalents and restricted cash (1,958) (3,470)
Net decrease in cash, cash equivalents and restricted cash (11,592) (15,043)
Cash, cash equivalents and restricted cash, beginning of period 112,982 155,342
Cash, cash equivalents and restricted cash, end of period 101,390 140,299
Non-cash investing and financing activities:    
Decrease in accounts payable and accrued liabilities related to property, plant and equipment purchases 9,187 4,165
Operating lease, right-of-use assets obtained in exchange for lease obligations 3,635 3,438
Supplemental disclosure of cash flow information:    
Cash paid for income taxes, net 9,427 6,473
Cash paid for interest 212 294
Operating cash outflows from operating leases 4,514 4,379
Reconciliation of cash, cash equivalents and restricted cash:    
Cash and cash equivalents 97,981 136,395
Restricted cash, current 1,144 2,102
Restricted cash, non-current 2,265 1,802
Total cash, cash equivalents and restricted cash $ 101,390 $ 140,299