CONDENSED CONSOLIDATED STATEMENT OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended				6 Months Ended		12 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
OPERATING ACTIVITIES:
Net income/(loss)	$ 64,496	$ (92,860)	$ (234,532)	$ (1,146)	$ (28,364)	$ (235,678)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization					15,869	16,232
Stock-based compensation					50,957	260,365
Deferred income taxes					0	(16,981)
Non-cash lease expense					638	0
Other					502	565
Changes in operating assets and liabilities:
Accounts receivable and due from vendors					(1,701)	(105)
Prepaid expenses and other current assets					(3,021)	(10,786)
Accounts payable and accrued liabilities					9,260	4,260
Deferred revenue					30,294	30,766
Funds payable to customers					9,456	10,097
Other operating assets and liabilities					(207)	88
Net cash provided by operating activities					83,683	58,823
INVESTING ACTIVITIES:
Proceeds from the sale and maturities of marketable securities					15,940	14,805
Purchases of marketable securities					(17,016)	(14,181)
Purchase of property and equipment					(5,735)	(2,415)
Cash paid for acquisitions, net of acquired cash					0	(202,515)
Net cash used in investing activities					(6,811)	(204,306)
FINANCING ACTIVITIES:
Principal payments on debt					(6,793)	(6,793)
Payments for repurchase and retirement of Class A common stock					(35,202)	0
Taxes paid related to net share settlement of equity awards					(15,269)	(25,735)
Proceeds from exercise of stock options					2,110	3,566
Proceeds from issuance of Class C (authorized on March 15, 2021) common stock, net of issuance costs					0	304,409
Dividends paid					0	(367)	$ (367)
Net cash (used in)/provided by financing activities					(55,154)	275,080
Effect of exchange rate changes on cash, cash equivalents, and restricted cash					(600)	(38)
Net increase in cash, cash equivalents, and restricted cash					21,118	129,559
Cash, cash equivalents, and restricted cash at the beginning of the period		$ 233,680		$ 57,891	233,680	57,891	57,891
Cash, cash equivalents, and restricted cash at the end of the period	254,798		187,450		254,798	187,450	233,680
Reconciliation of cash, cash equivalents, and restricted cash:
Cash and cash equivalents	215,092		160,142		215,092	160,142	203,247
Restricted cash	39,706		27,308		39,706	27,308
Cash, cash equivalents, and restricted cash at the end of the period	$ 254,798		$ 187,450		254,798	187,450	$ 233,680
SUPPLEMENTAL DISCLOSURE OF CASH FLOW
Cash paid during the year for interest					5,247	5,628
Cash paid during the year for income taxes					5,968	1,080
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCE ACTIVITIES
Purchases of property and equipment included in accounts payable and accrued liabilities					1,582	1,090
Non-cash leasehold improvements					5,679	0
Capitalized stock-based compensation					259	42
Issuance of Class C (authorized on March 15, 2021) common stock for acquisition					0	188,179
Receivables for exercise of stock options included in prepaid expenses and other current assets					$ 0	$ 103