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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

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