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Condensed Consolidated Statements of Cash Flows - USD ($)
 3 Months Ended
Mar. 28, 2020
Mar. 30, 2019
Cash flows from operating activities:    
Net income $ 64,456,000 $ 49,322,000
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 6,379,000 5,419,000
Stock-based compensation 11,272,000 7,317,000
Loss on disposal of property, equipment and intangibles 49,000 65,000
Provision for doubtful accounts 94,000 234,000
Benefit for deferred income taxes 0 (31,000)
Changes in operating assets and liabilities:    
Increase in accounts receivable (17,105,000) (8,531,000)
Decrease in inventories 427,000 1,357,000
Decrease in other current assets 5,469,000 3,043,000
Increase in lease receivable, net (1,747,000) (3,104,000)
(Increase) decrease in deferred costs and other contract assets (796,000) 7,120,000
Increase in other non-current assets (51,000) (115,000)
Decrease in accounts payable (7,968,000) (6,097,000)
Decrease in accrued compensation (17,687,000) (19,364,000)
Increase (decrease) in accrued liabilities 1,704,000 (2,736,000)
(Decrease) increase in income tax payable (2,041,000) 5,566,000
(Decrease) increase in deferred revenue and other contract-related liabilities (676,000) 2,377,000
Increase in other non-current liabilities 576,000 626,000
Net cash provided by operating activities 42,355,000 42,468,000
Cash flows from investing activities:    
Maturities (purchases) of short-term investments, net (70,000,000) 180,000,000
Purchases of property and equipment, net (37,004,000) (6,963,000)
Increase in intangible assets (1,135,000) (1,040,000)
Business combination, net of cash acquired, and strategic investments 47,250,000 0
Net cash used in investing activities (15,389,000) (188,003,000)
Cash flows from financing activities:    
Proceeds from issuance of common stock 13,044,000 6,288,000
Payroll tax withholdings on behalf of employees for vested equity awards 1,424,000 123,000
Repurchases of common stock (371,000) 0
Net cash provided by financing activities 11,249,000 6,165,000
Effect of foreign currency exchange rates on cash 2,000 (261,000)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect 38,217,000 (139,631,000)
Cash, cash equivalents and restricted cash at end of period 605,916,000 412,861,000
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents $ 606,292,000 $ 413,010,000