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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 26, 2021
Jun. 27, 2020
Cash flows from operating activities:    
Net income $ 37,530 $ 36,359
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 12,678 9,240
Amortization 13,900 13,717
Reduction in the carrying amount of right-of-use assets 3,652 2,419
Stock-based compensation expense 13,665 11,265
Provision for excess and obsolete inventories 6,898 6,407
Gain on contingent consideration (95) (3,700)
Other adjustments to reconcile net income to net cash provided by operating activities 1,211 1,327
Changes in assets and liabilities:    
Accounts receivable (1,194) 11,364
Inventories (20,388) (11,089)
Prepaid expenses and other current assets 3,179 (3,271)
Other assets (344) 248
Accounts payable (2,028) 5,247
Accrued liabilities (235) 1,529
Other liabilities 184 292
Deferred revenues 1,522 3,855
Operating lease liabilities (3,980) (2,762)
Net cash provided by operating activities 66,155 82,447
Cash flows from investing activities:    
Acquisition of property, plant and equipment (31,322) (36,743)
Proceeds from sale of a subsidiary 0 82
Purchases of marketable securities (71,186) (19,726)
Proceeds from maturities and sales of marketable securities 42,695 35,410
Net cash used in investing activities (59,813) (20,977)
Cash flows from financing activities:    
Proceeds from issuances of common stock 5,909 4,935
Purchase of common stock through stock repurchase program (23,951) 0
Tax withholdings related to net share settlements of equity awards (5,261) (3,800)
Payment of contingent consideration (3,873) 0
Proceeds from term loan debt 0 18,000
Principal repayments on term loans (4,740) (26,322)
Payment of term loan debt issuance costs 0 (78)
Net cash used in financing activities (31,916) (7,265)
Effect of exchange rate changes on cash, cash equivalents and restricted cash (1,558) 583
Net increase (decrease) in cash, cash equivalents and restricted cash (27,132) 54,788
Cash, cash equivalents and restricted cash, beginning of period 191,098 147,937
Cash, cash equivalents and restricted cash, end of period 163,966 202,725
Non-cash investing and financing activities:    
Increase (decrease) in accounts payable and accrued liabilities related to property, plant and equipment purchases 2,906 (2,274)
Operating lease, right-of-use assets obtained in exchange for lease obligations 11,629 428
Supplemental disclosure of cash flow information:    
Cash paid for income taxes, net 4,559 4,133
Cash paid for interest 339 473
Reconciliation of cash, cash equivalents and restricted cash:    
Cash and cash equivalents 160,273 199,926
Restricted cash, current 1,857 1,424
Restricted cash, non-current 1,836 1,375
Total cash, cash equivalents and restricted cash $ 163,966 $ 202,725