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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 28, 2024
Dec. 30, 2023
Dec. 31, 2022
Cash flows from operating activities:      
Net income $ 69,614 $ 82,387 $ 50,738
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation 30,321 30,603 28,646
Amortization 2,582 6,850 9,391
Amortization (accretion) of discount on investments (3,240) (2,828) 182
Reduction in the carrying amount of right-of-use assets 6,803 7,389 8,153
Stock-based compensation expense 39,763 38,616 31,337
Deferred income tax benefit (13,355) (12,100) (6,343)
Gain on sale of business (20,581) (72,953) 0
Provision for excess and obsolete inventories 12,342 15,003 24,632
Acquired inventory step-up amortization 0 501 476
Loss on disposal of long-lived assets 0 0 296
Non-cash restructuring charges 428 0 200
Foreign currency transaction losses 1,509 2,282 2,251
Other than temporary impairment on debt receivable 0 1,083 0
Changes in assets and liabilities:      
Accounts receivable (1,921) (23,304) 26,028
Inventories (8,259) (9,488) (28,780)
Prepaid expenses and other current assets 546 (3,057) (4,591)
Other assets 285 (146) 66
Accounts payable (8,235) 1,319 3,899
Accrued liabilities 3,675 (2,424) (8,002)
Other liabilities 9,834 4,660 (63)
Deferred revenues 2,699 (10,176) 1,286
Deferred grant 0 18,000 0
Operating lease liabilities (7,276) (7,615) (8,016)
Net cash provided by operating activities 117,534 64,602 131,786
Cash flows from investing activities:      
Acquisition of property, plant and equipment (38,436) (56,027) (65,254)
Acquisition of business, net of cash acquired 0 0 (3,350)
Proceeds from sale of business 21,585 101,785 0
Purchase of promissory note receivable (1,500) 0 (1,000)
Purchases of marketable securities (139,091) (135,462) (101,894)
Proceeds from maturities and sales of marketable securities 123,962 118,753 95,794
Net cash provided by (used in) investing activities (33,480) 29,049 (75,704)
Cash flows from financing activities:      
Proceeds from issuances of common stock 9,748 8,822 10,499
Purchase of common stock through stock repurchase program (53,302) (19,801) (82,328)
Tax withholdings related to net share settlements of equity awards (19,983) (10,687) (15,705)
Payments on term loan (1,075) (1,045) (8,398)
Net cash used in financing activities (64,612) (22,711) (95,932)
Effect of exchange rate changes on cash, cash equivalents and restricted cash (3,509) (2,649) (2,510)
Net increase (decrease) in cash, cash equivalents and restricted cash 15,933 68,291 (42,360)
Cash, cash equivalents and restricted cash, beginning of year 181,273 112,982 155,342
Cash, cash equivalents and restricted cash, end of year 197,206 181,273 112,982
Supplemental disclosure of non-cash investing and financing activities:      
Operating lease, right-of-use assets obtained in exchange for lease obligations 61 6,491 4,975
Increase (decrease) in accounts payable and accrued liabilities related to property, plant and equipment purchases 7,194 (5,961) 7,469
Supplemental disclosure of cash flow information:      
Cash paid for income taxes, net 15,584 17,385 10,917
Cash paid for interest 391 422 535
Operating cash outflows from operating leases 9,308 9,135 8,913
Reconciliation of cash, cash equivalents and restricted cash:      
Cash and cash equivalents 190,728 177,812 109,130
Restricted cash, current 3,746 1,152 1,221
Restricted cash 2,732 2,309 2,631
Total cash, cash equivalents and restricted cash $ 197,206 $ 181,273 $ 112,982