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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 26, 2025
Sep. 27, 2024
Cash flows from operating activities:    
Net income (loss) $ (62,139) $ 14,020
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Depreciation of property, plant, and equipment 6,312 4,516
Non-cash operating lease expense 2,665 2,589
Impairment of fixed assets and operating lease right-of-use assets 14,593  
Accretion/Amortization of investments available for sale (55) (410)
Deferred income taxes (718) 47
Change in net pension liability 43 (162)
Loss on disposal of property and equipment 23 1,668
Stock-based compensation expense 21,975 22,541
Change in asset retirement obligation   24
Provision for sales returns and credit losses 975 1,947
Inventory provision 3,261 1,873
Changes in working capital:    
Accounts receivable 18,004 (9,703)
Inventories (12,449) (5,962)
Prepayments, deposits, and other assets (9,709) (12,237)
Accounts payable (7,911) (2,031)
Other current and non-current liabilities (5,186) (3,637)
Net cash provided by (used in) operating activities (30,316) 15,083
Cash flows from investing activities:    
Acquisition of property and equipment (4,143) (17,669)
Purchase of investments available for sale (26,464) (61,194)
Proceeds from maturity of investments available for sale 92,984 38,291
Proceeds from Sale of Debt Securities, Available-for-Sale 3,377 850
Net cash provided by (used in) investing activities 65,754 (39,722)
Cash flows from financing activities:    
Repayment of finance lease obligations (42) (124)
Repurchase of common stock (6,461)  
Repurchase of employee common stock for taxes withheld (1,356) (1,396)
Proceeds from the exercise of stock options 3,351 7,352
Proceeds from vested restricted and performance stock units 3 2
Net cash provided by (used in) financing activities (4,505) 5,834
Effect of exchange rate changes on cash and cash equivalents 1,063 (230)
Increase (decrease) in cash and cash equivalents 31,996 (19,035)
Cash and cash equivalents, at beginning of the year 144,159 183,038
Cash and cash equivalents, at end of the period $ 176,155 $ 164,003