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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 27, 2021
Mar. 28, 2020
Cash flows from operating activities:    
Net income $ 19,625 $ 15,890
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 6,130 4,561
Amortization 6,805 7,263
Reduction in the carrying amount of right-of-use assets 1,811 1,511
Stock-based compensation expense 7,077 5,623
Provision for excess and obsolete inventories 3,394 3,287
Other adjustments to reconcile net income to net cash provided by operating activities 2,140 407
Changes in assets and liabilities:    
Accounts receivable 3,576 7,803
Inventories (9,911) 928
Prepaid expenses and other current assets 3,011 (240)
Other assets (50) 194
Accounts payable 5,722 763
Accrued liabilities (12,732) (6,970)
Other liabilities 114 33
Deferred revenues (2,411) (123)
Operating lease liabilities (1,945) (1,591)
Net cash provided by operating activities 32,356 39,339
Cash flows from investing activities:    
Acquisition of property, plant and equipment (13,470) (12,050)
Proceeds from sale of a subsidiary 0 40
Purchases of marketable securities (41,062) (16,441)
Proceeds from maturities and sales of marketable securities 14,610 23,009
Net cash used in investing activities (39,922) (5,442)
Cash flows from financing activities:    
Proceeds from issuances of common stock 5,487 4,513
Purchase of common stock through stock repurchase program (5,738) 0
Tax withholdings related to net share settlements of equity awards (1,141) (385)
Principal repayments on term loans (2,376) (13,199)
Net cash used in financing activities (3,768) (9,071)
Effect of exchange rate changes on cash, cash equivalents and restricted cash (1,456) 312
Net increase (decrease) in cash, cash equivalents and restricted cash (12,790) 25,138
Cash, cash equivalents and restricted cash, beginning of period 191,098 147,937
Cash, cash equivalents and restricted cash, end of period 178,308 173,075
Non-cash investing and financing activities:    
Change in accounts payable and accrued liabilities related to property, plant and equipment purchases 1,087 (2,116)
Operating lease, right-of-use assets obtained in exchange for lease obligations 8,572 6,307
Supplemental disclosure of cash flow information:    
Cash paid for income taxes, net 1,034 2,419
Cash paid for interest 173 291
Reconciliation of cash, cash equivalents and restricted cash:    
Total cash, cash equivalents and restricted cash $ 178,308 $ 173,075