CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Total revenue	$ 105,419	$ 91,798	$ 323,556	$ 258,258
Operating expenses:
Operations and technology	34,328	26,395	103,877	71,489
Selling, general, and administrative	34,701	33,787	106,897	85,275
Depreciation and amortization	3,004	2,348	7,868	5,877
Total operating expenses	130,509	116,448	402,474	309,371
Loss from operations	(25,090)	(24,650)	(78,918)	(51,113)
Other income (expense):
Interest income	1,936	29	2,618	100
Interest expense	(235)	(121)	(683)	(582)
Total other income (expense)	1,701	(92)	1,935	(482)
Loss before income taxes	(23,389)	(24,742)	(76,983)	(51,595)
Provision for income taxes	279	61	695	275
Net loss	$ (23,668)	$ (24,803)	$ (77,678)	$ (51,870)
Weighted-average shares-basic	157,264,153	155,037,911	156,747,507	115,075,030
Weighted-average shares-diluted	157,264,153	155,037,911	156,747,507	115,075,030
Net loss per share - basic	$ (0.15)	$ (0.16)	$ (0.50)	$ (0.45)
Net loss per share - diluted	$ (0.15)	$ (0.16)	$ (0.50)	$ (0.45)
Marketplace And Service Cost [Member]
Operating expenses:
Cost of revenue	$ 46,255	$ 41,547	$ 143,400	$ 113,844
Customer Assurance Cost [Member]
Operating expenses:
Cost of revenue	12,221	12,371	40,432	32,886
Marketplace And Service Revenue [Member]
Total revenue	90,852	79,306	276,951	221,632
Customer Assurance Revenue [Member]
Total revenue	$ 14,567	$ 12,492	$ 46,605	$ 36,626