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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 26, 2020
Dec. 28, 2019
Dec. 29, 2018
Cash flows from operating activities:      
Net income $ 78,523 $ 39,346 $ 104,036
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation 20,694 17,185 14,314
Amortization 27,991 27,672 29,373
Accretion of discount on investments (2) (365) (10)
Reduction in the carrying amount of right-of-use assets 5,955 5,269 0
Stock-based compensation expense 23,830 23,176 17,827
Amortization of debt issuance costs 32 160 390
Deferred income tax provision (benefit) (562) 4,954 (74,908)
Provision for excess and obsolete inventories 13,117 10,421 10,479
Acquired inventory step-up amortization 838 465 0
Loss on disposal of long-lived assets 451 486 325
Gain on contingent consideration (2,879) 0 0
Foreign currency transaction losses (gains) (968) 408 125
Loss on derivative instruments 372 110 0
Changes in assets and liabilities:      
Accounts receivable (3,545) 481 (13,830)
Inventories (22,191) (14,295) (21,298)
Prepaid expenses and other current assets (6,207) 230 1,204
Other assets 179 (441) 707
Accounts payable 16,788 (27) 3,050
Accrued liabilities 13,892 7,517 (6,219)
Other liabilities 362 166 3,109
Deferred revenues 8,901 3,130 26
Operating lease liabilities (6,315) (5,000) 0
Net cash provided by operating activities 169,256 121,048 68,700
Cash flows from investing activities:      
Acquisition of property, plant and equipment (55,865) (20,847) (19,869)
Acquisition of business, net of cash acquired (51,880) (20,524) 0
Proceeds from sale of subsidiary 82 132 94
Proceeds from sale of property and property, plant and equipment 0 0 23
Purchases of marketable securities (51,224) (76,327) (30,566)
Proceeds from maturities of marketable securities 59,965 51,214 29,023
Net cash used in investing activities (98,922) (66,352) (21,295)
Cash flows from financing activities:      
Proceeds from issuances of common stock 10,010 8,093 7,712
Tax withholdings related to net share settlements of equity awards (15,450) (8,025) (5,791)
Proceeds from term loan 18,000 23,354 0
Payments on term loan (43,417) (30,000) (41,250)
Payment of term loan issuance costs (78) 0 0
Net cash used in financing activities (30,935) (6,578) (39,329)
Effect of exchange rate changes on cash, cash equivalents and restricted cash 3,762 (727) (256)
Net increase in cash, cash equivalents and restricted cash 43,161 47,391 7,820
Cash, cash equivalents and restricted cash, beginning of year 147,937 100,546 92,726
Cash, cash equivalents and restricted cash, end of year 191,098 147,937 100,546
Supplemental disclosure of non-cash investing and financing activities:      
Operating lease, right-of-use assets obtained in exchange for lease obligations 1,912 36,709 0
Contingent consideration payable related to FRT acquisition 0 5,364 0
Change in accounts payable and accrued liabilities related to property, plant and equipment purchases 2,545 866 2,290
Supplemental disclosure of cash flow information:      
Income taxes paid, net 9,150 4,324 4,576
Cash paid for interest 867 1,405 3,113
Reconciliation of cash, cash equivalents and restricted cash:      
Total cash, cash equivalents and restricted cash $ 191,098 $ 100,546 $ 92,726