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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Operating activities: |  |  |
Net (loss) income | $ (7,524,000) | $ 34,355,000 | $ 22,501,000
Adjustments to reconcile net (loss) income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 13,332,000 | 8,594,000 | 3,701,000
Reduction in carrying amount of right-of-use assets | 8,210,000 | 8,105,000 | 0
Credit losses and sales allowances | 2,732,000 | 124,000 | 1,912,000
Net realized (gain) loss on short-term investments | (94,000) | 41,000 | 153,000
Deferred taxes | (20,830,000) | (2,614,000) | (8,274,000)
Release of liabilities for unrecognized tax benefits | 0 | (2,837,000) | 0
Share-based compensation expense | 11,153,000 | 10,209,000 | 14,636,000
Digital asset impairment losses | 70,698,000 | 0 | 0
Gain on partial lease termination | (2,820,000) | 0 | 0
Amortization of debt discount and issuance costs on convertible senior notes | 1,543,000 | 0 | 0
Changes in operating assets and liabilities: |  |  |
Accounts receivable | (774,000) | (3,672,000) | (8,357,000)
Prepaid expenses and other current assets | 2,346,000 | 6,415,000 | (6,561,000)
Deposits and other assets | 416,000 | 761,000 | (1,201,000)
Accounts payable and accrued expenses | 9,445,000 | (7,321,000) | 3,378,000
Accrued compensation and employee benefits | (6,827,000) | (2,658,000) | 5,116,000
Deferred revenue and advance payments | (20,223,000) | 20,836,000 | (22,126,000)
Operating lease liabilities | (11,171,000) | (8,620,000) | 0
Other long-term liabilities | 4,007,000 | (851,000) | 5,749,000
Net cash provided by operating activities | 53,619,000 | 60,867,000 | 10,627,000
Investing activities: |  |  |
Purchases of digital assets | (1,125,000,000) | 0 | 0
Proceeds from redemption of short-term investments | 119,886,000 | 684,356,000 | 491,800,000
Purchases of property and equipment | (3,651,000) | (10,182,000) | (6,846,000)
Purchases of short-term investments | (9,928,000) | (320,487,000) | (694,018,000)
Net cash (used in) provided by investing activities | (1,018,693,000) | 353,687,000 | (209,064,000)
Financing activities: |  |  |
Proceeds from convertible senior notes classified as debt | 496,473,000 | 0 | 0
Proceeds from convertible senior notes classified as equity | 153,527,000 | 0 | 0
Issuance costs paid for convertible senior notes | (14,625,000) | 0 | 0
Proceeds from sale of class A common stock under exercise of employee stock options | 51,082,000 | 6,569,000 | 2,471,000
Purchases of treasury stock | (123,224,000) | (72,719,000) | (110,977,000)
Payments on capital lease obligations and other financing arrangements prior to the adoption of ASU 2016-02 | 0 | 0 | (9,000)
Net cash provided by (used in) financing activities | 563,233,000 | (66,150,000) | (108,515,000)
Effect of foreign exchange rate changes on cash, cash equivalents, and restricted cash | 4,784,000 | (1,374,000) | (3,444,000)
Net (decrease) increase in cash, cash equivalents, and restricted cash | (397,057,000) | 347,030,000 | (310,396,000)
Cash, cash equivalents, and restricted cash, beginning of year | 457,816,000 | 110,786,000 | 421,182,000
Cash, cash equivalents, and restricted cash, end of year | 60,759,000 | 457,816,000 | 110,786,000
Supplemental disclosure of cash flow information: |  |  |
Cash paid during the year for income taxes, net of tax refunds | $ 6,803,000 | $ 5,911,000 | $ 13,214,000

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