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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Cash flows from operating activities: |  |  |
Net income (loss) | $ 147,139 | $ (60,018) | $ (1,724)
Adjustments to reconcile net income (loss) to net cash provided by operating activities: |  |  |
Depreciation and amortization | 24,381 | 18,694 | 12,475
Amortization of issuance cost | 198 |  |
Coupon interest expense | 211 |  |
Purchase accounting adjustments to goodwill | 58 |  |
Loss on disposal and abandonment of intangible assets | 110 | 146 | 320
Loss on disposal and impairment of property, equipment, and other assets, net | 5,452 | 92 | 1,722
Realized and unrealized gains on strategic investments and marketable securities, net | (98,943) | (23,035) |
Stock-based compensation | 106,176 | 303,331 | 133,572
Deferred income taxes | 22,090 | (81,303) | (16,528)
Unrecognized tax benefits | 3,475 | (706) | 671
Bond amortization | (1,463) | 5,217 | 3,345
Noncash lease expense | 6,725 | 5,573 | 4,104
Provision for expected credit losses | 699 | (214) | 1,302
Change in assets and liabilities: |  |  |
Accounts and notes receivable and contract assets | (73,228) | (205,769) | (107,762)
Inventory | (95,987) | (18,272) | (52,156)
Prepaid expenses and other assets | (52,207) | (40,158) | (14,885)
Accounts payable, accrued and other liabilities | 80,757 | 45,301 | 8,886
Deferred revenue | 159,718 | 175,615 | 65,139
Net cash provided by operating activities | 235,361 | 124,494 | 38,481
Cash flows from investing activities: |  |  |
Purchases of investments | (764,374) | (362,479) | (656,522)
Proceeds from call / maturity of investments | 72,138 | 718,617 | 379,839
Exercise of warrants of strategic investments | (6,555) |  |
Proceeds from sale of strategic investments |  | 14,546 |
Purchases of property and equipment | (55,802) | (49,886) | (72,629)
Proceeds from disposal of property and equipment | 287 | 43 | 95
Purchases of intangible assets | (307) | (392) | (241)
Strategic investments | (74,250) | (45,500) | (7,068)
Business acquisition, net of cash acquired | (2,104) | (22,393) |
Net cash provided by (used in) investing activities | (830,967) | 252,556 | (356,526)
Cash flows from financing activities: |  |  |
Net proceeds from equity offering | (74) | 105,514 | 306,779
Proceeds from options exercised |  | 51,614 | 295
Income and payroll tax payments for net-settled stock awards | (4,870) | (331,309) | (7,809)
Net proceeds from issuance of convertible senior notes | 673,769 |  |
Proceeds from issuance of warrants | 124,269 |  |
Purchase of convertible note hedge | (194,994) |  |
Net cash provided by (used in) financing activities | 598,100 | (174,181) | 299,265
Effect of exchange rate changes on cash and cash equivalents | (3,380) | (1,982) | 1,976
Net increase (decrease) in cash and cash equivalents | (886) | 200,887 | (16,804)
Cash and cash equivalents and restricted cash, beginning of period | 356,438 | 155,551 | 172,355
Cash and cash equivalents and restricted cash, end of period | $ 355,552 | $ 356,438 | $ 155,551

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