Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Total revenue	$ 421,529	$ 358,435	$ 208,357
Operating expenses:
Operations and technology	136,522	101,056	64,998
Selling, general, and administrative	143,637	121,167	64,882
Depreciation and amortization	10,926	8,264	6,075
Total operating expenses	527,738	435,240	249,004
Loss from operations	(106,209)	(76,805)	(40,647)
Other income (expense):
Interest income	5,082	129	748
Interest expense	(979)	(782)	(633)
Total other income (expense)	4,103	(653)	115
Loss before income taxes	(102,106)	(77,458)	(40,532)
Provision for income taxes	87	724	489
Net loss	$ (102,193)	$ (78,182)	$ (41,021)
Net income (loss) per share attributable to common stockholders: basic	$ (0.65)	$ (0.62)	$ (1.90)
Net loss per share - diluted	$ (0.65)	$ (0.62)	$ (1.90)
Weighted-average shares - basic	156,994,254	125,332,800	21,596,379
Weighted-average number of shares of common stock - diluted	156,994,254	125,332,800	21,596,379
Marketplace And Service Revenue [Member]
Total revenue	$ 361,585	$ 308,350	$ 173,120
Customer Assurance Revenue [Member]
Total revenue	59,944	50,085	35,237
Marketplace And Service Cost [Member]
Operating expenses:
Cost of revenue	183,968	159,405	83,553
Customer Assurance Cost [Member]
Operating expenses:
Cost of revenue	$ 52,685	$ 45,348	$ 29,496