CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 1,419,630	$ 669,230
Marketable securities	1,060,488	1,091,076
Accounts receivable, net of allowances of $8,282 and $8,811 as of December 31, 2021 and 2020, respectively	653,355	563,733
Prepaid expenses and other current assets	48,090	33,502
Total current assets	3,181,563	2,357,541
Property and equipment, net	53,401	69,375
Operating lease right-of-use assets	227,912	155,916
Goodwill and intangible assets, net	61,115	13,562
Other assets	13,247	13,065
Total assets	3,537,238	2,609,459
Current liabilities:
Accounts payable	17,675	49,491
Accrued expenses and other current liabilities	242,131	155,340
Total current liabilities	259,806	204,831
Operating lease liabilities	209,181	139,321
Other liabilities	29,508	22,936
Total liabilities	498,495	367,088
Commitments and contingencies
Stockholders’ equity:
Common stock	7	6
Additional paid-in capital	5,059,528	4,574,934
Accumulated other comprehensive income (loss)	(2,181)	2,480
Accumulated deficit	(2,018,611)	(2,335,049)
Total stockholders’ equity	3,038,743	2,242,371
Total liabilities and stockholders’ equity	$ 3,537,238	$ 2,609,459