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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 25, 2021
Dec. 26, 2020
Dec. 28, 2019
Cash flows from operating activities:      
Net income $ 83,924 $ 78,523 $ 39,346
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation 25,772 20,694 17,185
Amortization 18,747 27,991 27,672
Amortization (accretion) of discount on investments 403 (2) (365)
Reduction in the carrying amount of right-of-use assets 7,172 5,955 5,269
Stock-based compensation expense 29,384 23,830 23,176
Amortization of debt issuance costs 5 32 160
Deferred income tax provision (benefit) 3,869 (562) 4,954
Provision for excess and obsolete inventories 15,544 13,117 10,421
Acquired inventory step-up amortization 723 838 465
Loss on disposal of long-lived assets 449 451 486
Non-cash restructuring charges 1,646 0 0
Gain on contingent consideration (95) (2,879) 0
Foreign currency transaction losses (gains) 1,577 (968) 408
Loss on derivative instruments 0 372 110
Changes in assets and liabilities:      
Accounts receivable (9,086) (3,545) 481
Inventories (31,655) (22,191) (14,295)
Prepaid expenses and other current assets 3,808 (6,207) 230
Other assets (326) 179 (441)
Accounts payable (6,589) 16,788 (27)
Accrued liabilities (725) 13,892 7,517
Other liabilities 285 362 166
Deferred revenues 1,974 8,901 3,130
Operating lease liabilities (7,442) (6,315) (5,000)
Net cash provided by operating activities 139,364 169,256 121,048
Cash flows from investing activities:      
Acquisition of property, plant and equipment (66,496) (55,865) (20,847)
Acquisition of business, net of cash acquired 0 (51,880) (20,524)
Proceeds from sale of subsidiary 0 82 132
Purchases of marketable securities (149,979) (51,224) (76,327)
Proceeds from maturities of marketable securities 91,734 59,965 51,214
Net cash used in investing activities (124,741) (98,922) (66,352)
Cash flows from financing activities:      
Proceeds from issuances of common stock 10,653 10,010 8,093
Purchase of common stock through stock repurchase program (24,038) 0 0
Tax withholdings related to net share settlements of equity awards (20,604) (15,450) (8,025)
Proceeds from term loan 0 18,000 23,354
Payments on term loan (9,337) (43,417) (30,000)
Payment of term loan issuance costs 0 (78) 0
Payment for Contingent Consideration Liability, Financing Activities 3,873 0 0
Net cash used in financing activities (47,199) (30,935) (6,578)
Effect of exchange rate changes on cash, cash equivalents and restricted cash (3,180) 3,762 (727)
Net increase (decrease) in cash, cash equivalents and restricted cash (35,756) 43,161 47,391
Cash, cash equivalents and restricted cash, beginning of year 191,098 147,937 100,546
Cash, cash equivalents and restricted cash, end of year 155,342 191,098 147,937
Supplemental disclosure of non-cash investing and financing activities:      
Operating lease, right-of-use assets obtained in exchange for lease obligations 12,254 1,912 36,709
Contingent consideration payable related to FRT acquisition 0 0 5,364
Increase in accounts payable and accrued liabilities related to property, plant and equipment purchases 2,711 2,545 866
Supplemental disclosure of cash flow information:      
Income taxes paid, net 7,957 9,150 4,324
Cash paid for interest 643 867 1,405
Operating cash outflows from operating leases 8,520 7,546 6,713
Reconciliation of cash, cash equivalents and restricted cash:      
Cash and cash equivalents 151,010 187,225 144,545
Restricted cash, current 2,233 1,904 1,981
Restricted cash 2,099 1,969 1,411
Total cash, cash equivalents and restricted cash $ 155,342 $ 191,098 $ 147,937