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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023
Cash flows from operating activities: |  |
Net income | $ 40,498 | $ 418,017
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 60,724 | 53,867
Net accretion of discount on marketable securities | (1,109) | (12,611)
Provision for doubtful accounts | 4,471 | 1,282
Asset impairment | 24,141 | 903
Non-cash interest expense | 6,462 | 6,254
Net loss (gain) from change in fair value of debt securities | 1,730 | (5,408)
Stock-based compensation | 159,530 | 157,635
Deferred income taxes | (27,644) | (38,295)
Changes in operating assets and liabilities: |  |
Accounts receivable | 208,956 | (118,249)
Inventory | 54,758 | (24,406)
Prepaid expenses and other assets | (117,856) | (57,376)
Accounts payable, accrued and other liabilities | (58,140) | 117,128
Warranty obligations | (4,855) | 57,420
Deferred revenues | (5,265) | 105,169
Net cash provided by operating activities | 346,401 | 661,330
Cash flows from investing activities: |  |
Purchases of property and equipment | (25,540) | (90,326)
Investments in private companies | 0 | (15,000)
Purchases of marketable securities | (1,091,511) | (1,743,674)
Maturities and sale of marketable securities | 994,677 | 1,406,608
Net cash used in investing activities | (122,374) | (442,392)
Cash flows from financing activities: |  |
Partial settlement of convertible notes | (7) | 0
Proceeds from issuance of common stock under employee equity plans | 7,969 | 1,315
Payment of withholding taxes related to net share settlement of equity awards | (73,801) | (93,100)
Repurchase of common stock | (191,698) | (310,000)
Net cash used in financing activities | (257,537) | (401,785)
Effect of exchange rate changes on cash and cash equivalents | 1,087 | (322)
Net decrease in cash and cash equivalents | (32,423) | (183,169)
Cash and cash equivalents—Beginning of period | 288,748 | 473,244
Cash and cash equivalents—End of period | 256,325 | 290,075
Supplemental disclosures of non-cash investing activities: |  |
Purchases of property and equipment included in accounts payable | $ 5,722 | $ 16,183

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