Consolidated statements of cash flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Operating activities
Net income (loss)	$ 416,855	$ 1,862,106	$ (35,610)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	25,151	21,266	21,509
Share-based compensation	880,463	765,795	647,860
Deferred income taxes	10,468	(1,600,434)	(1,838)
Non-cash charitable contributions	13,495	0	12,890
Impairment and abandonment charges for leases and leasehold improvements	0	0	117,315
Net amortization of investment premium and discount	(18,092)	(29,017)	(21,897)
Other	7,848	2,320	(2,654)
Changes in assets and liabilities:
Accounts receivable	(104,398)	(128,946)	(80,782)
Prepaid expenses and other assets	(3,502)	(17,187)	19,861
Operating lease right-of-use assets	30,895	32,711	55,324
Accounts payable	42,902	3,828	(9,261)
Accrued expenses and other liabilities	15,359	91,632	(43,249)
Operating lease liabilities	(33,180)	(39,480)	(66,507)
Net cash provided by operating activities	1,284,264	964,594	612,961
Investing activities
Purchases of property and equipment	(32,375)	(24,606)	(8,063)
Purchases of marketable securities	(1,566,944)	(1,510,013)	(1,308,020)
Sales of marketable securities	31,475	22,040	35,850
Maturities of marketable securities	1,433,362	1,291,562	1,243,240
Net cash used in investing activities	(134,482)	(221,017)	(36,993)
Financing activities
Proceeds from exercise of stock options, net	8,053	22,133	8,256
Repurchases of Class A common stock	(927,013)	(600,198)	(500,000)
Shares repurchased for tax withholdings on release of restricted stock units and restricted stock awards	(398,982)	(390,254)	(335,019)
Net cash used in financing activities	(1,317,942)	(968,319)	(826,763)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	2,301	(2,569)	1,667
Net decrease in cash, cash equivalents and restricted cash	(165,859)	(227,311)	(249,128)
Cash, cash equivalents and restricted cash, beginning of period	1,141,221	1,368,532	1,617,660
Cash, cash equivalents and restricted cash, end of period	975,362	1,141,221	1,368,532
Reconciliation of cash, cash equivalents and restricted cash to consolidated balance sheets
Cash and cash equivalents	969,342	1,136,460	1,361,936
Restricted cash included in prepaid expenses and other current assets	0	0	2,542
Restricted cash included in other assets	6,020	4,761	4,054
Total cash, cash equivalents and restricted cash	975,362	1,141,221	1,368,532
Supplemental cash flow information
Cash paid for income taxes, net	22,376	25,018	19,173
Non-cash investing and financing activities:
Operating lease right-of-use assets obtained in exchange for operating lease liabilities	$ 107,133	$ 31,132	$ 32,784