Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Operating activities
Net loss	$ (5,281)	$ (21,674)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	7,220	6,783
Share-based compensation	73,240	79,459
Non-cash charitable contributions	0	20,490
Other	2,978	2,029
Changes in assets and liabilities:
Accounts receivable	180,203	176,564
Prepaid expenses and other assets	(8,285)	(91)
Operating lease right-of-use assets	12,394	10,288
Accounts payable	(4,638)	(717)
Accrued expenses and other liabilities	(31,620)	8,298
Operating lease liabilities	(12,822)	(10,850)
Net cash provided by operating activities	213,389	270,579
Investing activities
Purchases of property and equipment and intangible assets	(6,902)	(1,251)
Purchases of marketable securities	(155,181)	(263,170)
Sales of marketable securities	4,168	79,831
Maturities of marketable securities	207,319	149,532
Net cash provided by (used in) investing activities	49,404	(35,058)
Financing activities
Proceeds from exercise of stock options, net	1,036	9,344
Net cash provided by financing activities	1,036	9,344
Effect of exchange rate changes on cash, cash equivalents and restricted cash	333	(355)
Net increase in cash, cash equivalents and restricted cash	264,162	244,510
Cash, cash equivalents and restricted cash, beginning of period	1,427,064	678,911
Cash, cash equivalents and restricted cash, end of period	1,691,226	923,421
Supplemental cash flow information
Accrued property and equipment	3,462	125
Operating lease right-of-use assets obtained in exchange for operating lease liabilities	$ 7,085	$ 630