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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Oct. 02, 2021
Sep. 26, 2020
Operating activities:    
Net income $ 218,497 $ 9,382
Adjustments to reconcile net income to net cash provided by operating activities:    
Stock-based compensation 18,055 9,800
Depreciation and amortization 11,351 10,311
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount (161,995) 0
Asset retirements and write-downs 0 3,749
Changes in operating assets and liabilities:    
Accounts receivable, net (22,510) (22,622)
Inventory (22,897) (1,464)
Prepaid expenses and other assets (9,776) 3,710
Accounts payable 18,311 5,616
Accrued liabilities (7,008) 3,834
Deferred revenue 6,691 (342)
Other long-term liabilities (4,544) (1,038)
Net cash provided by operating activities 44,175 20,936
Investing activities    
Purchases of property and equipment (7,271) (5,617)
Purchases of marketable securities (200,509) (39,986)
Maturities of marketable securities 125,000 0
Net cash used in investing activities (82,780) (45,603)
Financing activities:    
Proceeds from common stock issuances related to employee benefit plans 18,764 14,097
Payments related to financing arrangements (723) (2,342)
Proceeds from the sale of common stock in connection with public offering, net of expense 0 60,063
Proceeds from line of credit 0 30,000
Repayment of line of credit 0 (60,000)
Payments to originate the line of credit 0 (285)
Net cash provided by financing activities 18,041 41,533
Effect of exchange rate changes on cash and cash equivalents (28) 131
Net increase (decrease) in cash and cash equivalents (20,592) 16,997
Cash and cash equivalents at beginning of period 80,807 47,457
Cash and cash equivalents at end of period $ 60,215 $ 64,454