CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating activities:
Net (loss) income	$ (535,480)	$ (7,524)	$ 34,355
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization	11,358	13,332	8,594
Reduction in carrying amount of right-of-use assets	8,189	8,210	8,105
Credit losses and sales allowances	1,509	2,732	124
Net realized (gain) loss on short-term investments	0	(94)	41
Deferred taxes	(284,221)	(20,830)	(2,614)
Release of liabilities for unrecognized tax benefits	(561)	0	(2,837)
Share-based compensation expense	44,126	11,153	10,209
Digital asset impairment losses	830,621	70,698	0
Gain on partial lease termination	0	(2,820)	0
Amortization of issuance costs and debt discount on long-term debt	7,201	1,543	0
Changes in operating assets and liabilities:
Accounts receivable	2,618	(774)	(3,672)
Prepaid expenses and other current assets	(25)	2,346	6,415
Deposits and other assets	(1,713)	416	761
Accounts payable and accrued expenses	3,749	9,174	(7,321)
Accrued compensation and employee benefits	2,374	(6,827)	(2,658)
Accrued interest	1,222	271	0
Deferred revenue and advance payments	14,710	(20,223)	20,836
Operating lease liabilities	(10,222)	(11,171)	(8,620)
Other long-term liabilities	(1,622)	4,007	(851)
Net cash provided by operating activities	93,833	53,619	60,867
Investing activities:
Purchases of digital assets	(2,626,529)	(1,125,000)	0
Proceeds from redemption of short-term investments	0	119,886	684,356
Purchases of property and equipment	(2,706)	(3,651)	(10,182)
Purchases of short-term investments	0	(9,928)	(320,487)
Net cash (used in) provided by investing activities	(2,629,235)	(1,018,693)	353,687
Financing activities:
Proceeds from convertible senior notes classified as debt	1,050,000	496,473	0
Proceeds from convertible senior notes classified as equity	0	153,527	0
Proceeds from senior secured notes	500,000	0	0
Proceeds from sale of class A common stock under exercise of employee stock options	40,651	51,082	6,569
Payment of withholding tax on vesting of restricted stock units	(4,695)	0	0
Purchases of treasury stock	0	(123,224)	(72,719)
Net cash provided by (used in) financing activities	2,541,685	563,233	(66,150)
Effect of foreign exchange rate changes on cash, cash equivalents, and restricted cash	(2,608)	4,784	(1,374)
Net increase (decrease) in cash, cash equivalents, and restricted cash	3,675	(397,057)	347,030
Cash, cash equivalents, and restricted cash, beginning of year	60,759	457,816	110,786
Cash, cash equivalents, and restricted cash, end of year	64,434	60,759	457,816
Supplemental disclosure of cash flow information:
Cash paid during the year for interest	20,416	178	11
Cash paid during the year for income taxes, net of tax refunds	7,010	6,803	5,911
Employee Stock Purchase Plan
Financing activities:
Proceeds from issuance of class A common stock under employee stock purchase plan	2,854	0	0
Class A
Financing activities:
Proceeds from sale of class A common stock under public offerings	1,000,000	0	0
Issuance costs paid related to sale of class A common stock under public offerings	(9,537)	0	0
Convertible Senior Notes
Financing activities:
Issuance costs paid	(24,796)	(14,625)	0
Senior Secured Notes
Financing activities:
Issuance costs paid	$ (12,792)	$ 0	$ 0