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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Operating activities: |  |  |
Net loss | $ (1,469,797) | $ (535,480) | $ (7,524)
Adjustments to reconcile net loss to net cash provided by operating activities: |  |  |
Depreciation and amortization | 10,874 | 11,358 | 13,332
Reduction in carrying amount of right-of-use assets | 8,072 | 8,189 | 8,210
Credit losses and sales allowances | 939 | 1,509 | 2,732
Net realized gain on short-term investments | 0 | 0 | (94)
Deferred taxes | 131,493 | (284,221) | (20,830)
Release of liabilities for unrecognized tax benefits | (360) | (561) | 0
Share-based compensation expense | 63,619 | 44,126 | 11,153
Digital asset impairment losses (gains on sale), net | 1,286,286 | 830,621 | 70,698
Gain on partial lease termination | 0 | 0 | (2,820)
Amortization of issuance costs and debt discount on long-term debt | 8,694 | 7,201 | 1,543
Changes in operating assets and liabilities: |  |  |
Accounts receivable | (5,292) | 2,618 | (774)
Prepaid expenses and other current assets | (6,342) | (25) | 2,346
Deposits and other assets | (7,455) | (1,713) | 416
Accounts payable and accrued expenses | (3,521) | 3,749 | 9,174
Accrued compensation and employee benefits | (12,344) | 2,374 | (6,827)
Accrued interest | 1,336 | 1,222 | 271
Deferred revenue and advance payments | 14,839 | 14,710 | (20,223)
Operating lease liabilities | (9,634) | (10,222) | (11,171)
Other long-term liabilities | (8,196) | (1,622) | 4,007
Net cash provided by operating activities | 3,211 | 93,833 | 53,619
Investing activities: |  |  |
Purchases of digital assets | (287,921) | (2,626,529) | (1,125,000)
Proceeds from sale of digital assets | 11,817 | 0 | 0
Proceeds from redemption of short-term investments | 0 | 0 | 119,886
Purchases of property and equipment | (2,486) | (2,706) | (3,651)
Purchases of short-term investments | 0 | 0 | (9,928)
Net cash used in investing activities | (278,590) | (2,629,235) | (1,018,693)
Financing activities: |  |  |
Proceeds from convertible senior notes classified as debt | 0 | 1,050,000 | 496,473
Proceeds from convertible senior notes classified as equity | 0 | 0 | 153,527
Proceeds from senior secured notes | 0 | 500,000 | 0
Proceeds from secured term loan, net of lender fees | 204,693 | 0 | 0
Issuance costs paid for secured term loan, excluding lender fees | (107) | 0 | 0
Proceeds from other long-term secured debt | 11,100 | 0 | 0
Issuance costs paid for other long-term secured debt | (270) | 0 | 0
Repayments of other long-term secured debt | (246) | 0 | 0
Proceeds from sale of common stock under public offerings | 46,592 | 1,000,000 | 0
Issuance costs paid related to sale of common stock under public offerings | (358) | (9,537) | 0
Proceeds from exercise of stock options | 1,393 | 40,651 | 51,082
Payment of withholding tax on vesting of restricted stock units | (2,082) | (4,695) | 0
Purchases of treasury stock | 0 | 0 | (123,224)
Net cash provided by financing activities | 265,188 | 2,541,685 | 563,233
Effect of foreign exchange rate changes on cash, cash equivalents, and restricted cash | (3,375) | (2,608) | 4,784
Net (decrease) increase in cash, cash equivalents, and restricted cash | (13,566) | 3,675 | (397,057)
Cash, cash equivalents, and restricted cash, beginning of year | 64,434 | 60,759 | 457,816
Cash, cash equivalents, and restricted cash, end of year | 50,868 | 64,434 | 60,759
Supplemental disclosure of cash flow information: |  |  |
Cash paid during the year for interest | 43,448 | 20,416 | 178
Cash paid during the year for income taxes, net of tax refunds | 21,973 | 7,010 | 6,803
Employee Stock Purchase Plan |  |  |
Financing activities: |  |  |
Proceeds from sales under employee stock purchase plan | 4,473 | 2,854 | 0
Convertible Senior Notes |  |  |
Financing activities: |  |  |
Issuance costs paid | 0 | (24,796) | (14,625)
Senior Secured Notes |  |  |
Financing activities: |  |  |
Issuance costs paid | $ 0 | $ (12,792) | $ 0

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