Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Cash flows from operating activities
Net loss	$ (36,901)	$ (76,689)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:
Depreciation and amortization	2,033	1,636
Stock-based compensation	20,811	32,244
Reduction in the carrying amount of right-of-use assets	1,832	0
Change in fair value of redeemable convertible preferred stock warrant liability	0	(2,816)
Change in fair value of the convertible notes	0	49,481
Loss on extinguishment of the convertible notes	0	(1,620)
Change in fair value of contingent consideration	(433)	0
Accretion of discounts and amortization of premiums on marketable securities, net	0	(169)
Other	277	3
Changes in operating assets and liabilities:
Prepaid expenses and other assets	(239)	1,405
Accounts payable	9,487	2,807
Funds payable to customers	(142)	10,003
Accrued expenses and other liabilities	4,092	379
Operating lease liabilities	(3,516)	0
Net cash (used in) provided by operating activities	(2,699)	25,874
Cash flows from investing activities
Purchases of property and equipment	(777)	(849)
Maturities of marketable securities	0	20,000
Net cash (used in) provided by investing activities	(777)	19,151
Cash flows from financing activities
Proceeds from initial public offering, net of underwriting discounts and commissions and offering costs	0	293,692
Proceeds from issuance of redeemable convertible preferred stock warrants	0	100
Tax withholding related to vesting of restricted stock units	0	(2,651)
Proceeds from exercise of stock options and employee stock purchase plan	2,706	2,125
Net cash provided by financing activities	2,706	293,266
Effect of foreign exchange rate changes on cash and cash equivalents	385	25
Net increase in cash and cash equivalents	(385)	338,316
Cash and cash equivalents
Beginning of period	581,538	238,902
End of period	581,153	577,218
Supplemental cash flow data
Cash paid for income taxes	246	258
Purchases of property and equipment not yet settled	55	0
Stock-based compensation capitalized to internal use software	104	289
Deferred offering costs included in accounts payable and accrued expenses and other current liabilities	0	182
Conversion of convertible notes upon initial public offering	0	104,902
Conversion of redeemable convertible preferred stock upon initial public offering	0	156,175
Reclassification of preferred stock warrant liability upon initial public offering	$ 0	$ 6,310