CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 754,154	$ 437,353
Short-term investments, net	204,625	186,685
Accounts receivable, net of allowance for credit losses of $7,374 and $7,253 as of December 31, 2021 and 2020, respectively	2,020,720	1,584,109
Prepaid expenses and other current assets	112,150	102,170
TOTAL CURRENT ASSETS	3,091,649	2,310,317
Property and equipment, net	135,856	115,863
Operating lease assets	234,091	248,143
Deferred income taxes	68,244	50,168
Other assets, non-current	47,500	29,154
TOTAL ASSETS	3,577,340	2,753,645
Current liabilities:
Accounts payable	1,655,684	1,348,480
Accrued expenses and other current liabilities	101,472	88,335
Operating lease liabilities	46,149	37,868
TOTAL CURRENT LIABILITIES	1,803,305	1,474,683
Operating lease liabilities, non-current	238,449	254,562
Other liabilities, non-current	8,280	11,255
TOTAL LIABILITIES	2,050,034	1,740,500
Commitments and contingencies (Note 13)
STOCKHOLDERS’ EQUITY
Preferred stock, par value $0.000001; 100,000 shares authorized, zero shares issued and outstanding as of December 31, 2021 and 2020
Common stock, par value $0.000001 Class A, 1,000,000 shares authorized; 439,206 and 423,383 shares issued and outstanding as of December 31, 2021 and 2020, respectively Class B, 95,000 shares authorized; 44,235 and 50,018 shares issued and outstanding as of December 31, 2021 and 2020, respectively	0	0
Additional paid-in capital	915,177	538,778
Retained earnings	612,129	474,367
TOTAL STOCKHOLDERS’ EQUITY	1,527,306	1,013,145
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 3,577,340	$ 2,753,645