Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Operating activities
Net income (loss)	$ (236,788)	$ (113,538)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	16,185	26,884
Share-based compensation	484,633	326,811
Non-cash charitable contributions	12,890	0
Impairment and abandonment charges for leases and leasehold improvements	117,315	0
Other	(15,470)	10,731
Changes in assets and liabilities:
Accounts receivable	59,303	144,083
Prepaid expenses and other assets	(2,308)	(37,960)
Operating lease right-of-use assets	43,785	39,140
Accounts payable	(16,711)	71,603
Accrued expenses and other liabilities	(54,780)	(17,852)
Operating lease liabilities	(53,373)	(38,990)
Net cash provided by operating activities	354,681	410,912
Investing activities
Purchases of property and equipment and intangible assets	(3,780)	(27,931)
Purchases of marketable securities	(1,065,445)	(688,146)
Sales of marketable securities	31,709	4,168
Maturities of marketable securities	978,804	735,819
Acquisition of business, net of cash acquired	0	(86,059)
Net cash used in investing activities	(58,712)	(62,149)
Financing activities
Proceeds from exercise of stock options, net	4,664	4,807
Repurchases of Class A common stock	(500,000)	0
Shares repurchased for tax withholdings on release of restricted stock units and restricted stock awards	(243,926)	(98,357)
Net cash used in financing activities	(739,262)	(93,550)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	648	(3,558)
Net increase (decrease) in cash, cash equivalents and restricted cash	(442,645)	251,655
Cash, cash equivalents and restricted cash, beginning of period	1,617,660	1,427,064
Cash, cash equivalents and restricted cash, end of period	1,175,015	1,678,719
Supplemental cash flow information
Operating lease right-of-use assets obtained in exchange for operating lease liabilities	$ 35,347	$ 19,783