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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 25, 2021
Dec. 26, 2020
Cash flows from operating activities:      
Net income $ 50,738 $ 83,924 $ 78,523
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation 28,646 25,772 20,694
Amortization 9,391 18,747 27,991
Amortization (accretion) of discount on investments 182 403 (2)
Reduction in the carrying amount of right-of-use assets 8,153 7,172 5,955
Stock-based compensation expense 31,337 29,384 23,830
Deferred income tax provision (benefit) (6,343) 3,869 (562)
Provision for excess and obsolete inventories 24,632 15,544 13,117
Acquired inventory step-up amortization 476 723 838
Loss on disposal of long-lived assets 296 449 451
Non-cash restructuring charges 200 1,646 0
Gain on contingent consideration 0 (95) (2,879)
Foreign currency transaction losses (gains) 2,251 1,582 (936)
Loss on derivative instruments 0 0 372
Changes in assets and liabilities:      
Accounts receivable 26,028 (9,086) (3,545)
Inventories (28,780) (31,655) (22,191)
Prepaid expenses and other current assets (4,591) 3,808 (6,207)
Other assets 66 (326) 179
Accounts payable 3,899 (6,589) 16,788
Accrued liabilities (8,002) (725) 13,892
Other liabilities (63) 285 362
Deferred revenues 1,286 1,974 8,901
Operating lease liabilities (8,016) (7,442) (6,315)
Net cash provided by operating activities 131,786 139,364 169,256
Cash flows from investing activities:      
Acquisition of property, plant and equipment (65,254) (66,496) (55,865)
Acquisition of business, net of cash acquired (3,350) 0 (51,880)
Proceeds from sale of subsidiary 0 0 82
Purchase of promissory note receivable (1,000) 0 0
Purchases of marketable securities (101,894) (149,979) (51,224)
Proceeds from maturities of marketable securities 95,794 91,734 59,965
Net cash used in investing activities (75,704) (124,741) (98,922)
Cash flows from financing activities:      
Proceeds from issuances of common stock 10,499 10,653 10,010
Purchase of common stock through stock repurchase program (82,328) (24,038) 0
Tax withholdings related to net share settlements of equity awards (15,705) (20,604) (15,450)
Proceeds from term loan 0 0 18,000
Payments on term loan (8,398) (9,337) (43,417)
Payment of term loan issuance costs 0 0 (78)
Payment of contingent consideration 0 3,873 0
Net cash used in financing activities (95,932) (47,199) (30,935)
Effect of exchange rate changes on cash, cash equivalents and restricted cash (2,510) (3,180) 3,762
Net increase (decrease) in cash, cash equivalents and restricted cash (42,360) (35,756) 43,161
Cash, cash equivalents and restricted cash, beginning of year 155,342 191,098 147,937
Cash, cash equivalents and restricted cash, end of year 112,982 155,342 191,098
Supplemental disclosure of non-cash investing and financing activities:      
Operating lease, right-of-use assets obtained in exchange for lease obligations 4,975 12,254 1,912
Increase in accounts payable and accrued liabilities related to property, plant and equipment purchases 7,469 2,711 2,545
Supplemental disclosure of cash flow information:      
Income taxes paid, net 10,917 7,957 9,150
Cash paid for interest, net 535 643 867
Operating cash outflows from operating leases 8,913 8,520 7,546
Reconciliation of cash, cash equivalents and restricted cash:      
Cash and cash equivalents 109,130 151,010 187,225
Restricted cash, current 1,221 2,233 1,904
Restricted cash 2,631 2,099 1,969
Total cash, cash equivalents and restricted cash $ 112,982 $ 155,342 $ 191,098