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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Apr. 01, 2022
Apr. 02, 2021
Statement of Cash Flows [Abstract]    
Net income $ 68,573 $ 1,601
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 4,490 3,227
Stock-based compensation 19,759 34,653
Non-cash lease expense 1,385 1,221
Deferred taxes 15,318 (3,388)
Other, net 1,580 6,578
Changes in operating assets and liabilities:    
Trade receivables, net 91,793 (17,690)
Inventory (3,520) (2,090)
Prepaid expenses and other assets (3,605) 1,872
Deferred revenue (1,169) 13,422
Accrued collaboration liabilities (54,261) 1,005
Accounts payable and other liabilities 7,376 (867)
Net cash provided by operating activities 147,719 39,544
Cash flows from investing activities:    
Purchases of property, equipment and other (5,609) (13,557)
Purchases of investments (336,545) (331,612)
Proceeds from maturities and sales of investments 267,615 407,424
Net cash (used in) provided by investing activities (74,539) 62,255
Cash flows from financing activities:    
Proceeds from issuance of common stock under equity incentive plans 4,891 2,791
Taxes paid related to net share settlement of equity awards (4,686) (5,441)
Net cash provided by (used in) financing activities 205 (2,650)
Net increase in cash, cash equivalents, and restricted cash equivalents 73,385 99,149
Cash, cash equivalents and restricted cash equivalents at beginning of period 663,891 320,772
Cash, cash equivalents and restricted cash equivalents at end of period $ 737,276 $ 419,921