Consolidated statements of cash flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Operating activities
Net income (loss)	$ (35,610)	$ (96,047)	$ 316,438
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	21,509	46,489	27,500
Share-based compensation	647,860	497,123	415,382
Non-cash charitable contributions	12,890	0	45,300
Impairment and abandonment charges for leases and leasehold improvements	117,315	0	0
Amortization (accretion) of investment premiums discount	(21,897)	(638)	5,908
Other	(2,438)	(13,251)	3,699
Changes in assets and liabilities:
Accounts receivable	(80,782)	(28,856)	(88,862)
Prepaid expenses and other assets	18,102	(30,214)	(14,727)
Operating lease right-of-use assets	55,324	56,024	43,995
Accounts payable	(9,261)	70,777	(33,451)
Accrued expenses and other liabilities	(43,544)	20,627	82,435
Operating lease liabilities	(66,507)	(52,832)	(50,710)
Net cash provided by operating activities	612,961	469,202	752,907
Investing activities
Purchases of property and equipment and intangible assets	(8,063)	(28,984)	(9,031)
Purchases of marketable securities	(1,308,020)	(1,028,480)	(1,104,087)
Sales of marketable securities	35,850	7,417	274,654
Maturities of marketable securities	1,243,240	1,007,861	849,520
Acquisition of business, net of cash acquired	0	(86,059)	(36,914)
Net cash used in investing activities	(36,993)	(128,245)	(25,858)
Financing activities
Proceeds from exercise of stock options, net	8,256	12,882	23,912
Repurchases of Class A common stock	(500,000)	0	0
Shares repurchased for tax withholdings on release of restricted stock units and restricted stock awards	(335,019)	(161,809)	0
Payment of deferred offering costs and other financing activities	0	0	(1,750)
Net cash (used in) provided by financing activities	(826,763)	(148,927)	22,162
Effect of exchange rate changes on cash, cash equivalents and restricted cash	1,667	(1,434)	(1,058)
Net increase in cash, cash equivalents and restricted cash	(249,128)	190,596	748,153
Cash, cash equivalents and restricted cash, beginning of period	1,617,660	1,427,064	678,911
Cash, cash equivalents and restricted cash, end of period	1,368,532	1,617,660	1,427,064
Supplemental cash flow information
Cash paid for income taxes, net	19,173	10,008	1,494
Non-cash investing and financing activities:
Operating lease right-of-use assets obtained in exchange for operating lease liabilities	$ 32,784	$ 31,515	$ 118,977