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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 26, 2020
Sep. 28, 2019
Cash flows from operating activities:    
Net income $ 169,633 $ 143,295
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 21,200 17,569
Stock-based compensation 36,372 29,645
Loss on disposal of property, equipment and intangibles 202 149
Provision for doubtful accounts (5) (678)
Provision (benefit) for deferred income taxes 136 (19)
Changes in operating assets and liabilities:    
Increase in accounts receivable (9,459) (21,697)
Increase in inventories (86,815) (15,221)
Increase in other current assets (23,461) (12,060)
Increase in lease receivable, net (6,279) (9,396)
(Increase) decrease in deferred costs and other contract assets (1,964) 8,901
Increase in other non-current assets (775) (68)
Increase (decrease) in accounts payable 31,793 (1,223)
Increase (decrease) in accrued compensation 3,654 (975)
Increase in accrued liabilities 4,691 389
(Decrease) increase in income tax payable (2,756) 3,430
Increase in deferred revenue and other contract-related liabilities 9,973 6,760
Increase in other non-current liabilities 395 1,259
Net cash provided by operating activities 146,545 151,416
Cash flows from investing activities:    
Maturities (purchases) of short-term investments, net (70,000) 120,000
Purchases of property and equipment, net (60,017) (56,064)
Increase in intangible assets (5,763) (2,968)
Business combinations, net of cash acquired 78,310 0
Other strategic investing activities (6,750) (5,189)
Net cash used in investing activities (80,840) (184,221)
Cash flows from financing activities:    
Proceeds from issuance of common stock 40,994 22,706
Payroll tax withholdings on behalf of employees for vested equity awards (1,449) (123)
Repurchases of common stock (591) (27,924)
Net cash provided by (used in) financing activities 38,954 (5,341)
Effect of foreign currency exchange rates on cash (294) (983)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect 104,365 (39,129)
Cash, cash equivalents and restricted cash at end of period 669,056 513,360
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents $ 672,440 $ 513,512