Segment Information - Summary of Information Used by CODM (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Total revenue	$ 637,156	$ 481,234	$ 421,529
Less:
Depreciation and amortization	36,685	18,988	10,926
Total operating expenses	721,261	570,911	527,738
Loss from operations	(84,105)	(89,677)	(106,209)
Interest income	9,337	16,507	5,082
Interest expense	(4,244)	(1,565)	(979)
Provision for income taxes	(688)	(526)	(87)
Net income (loss)	(79,700)	(75,261)	(102,193)
ACV Segment
Segment Reporting Information [Line Items]
Total revenue	637,156	481,234	421,529
Less:
Marketplace operations	105,272	88,866	87,675
Technology and development	57,428	52,093	48,847
Sales and marketing	96,849	77,275	74,229
General and administrative	120,586	89,235	69,408
Depreciation and amortization	36,685	18,988	10,926
Total operating expenses	721,261	570,911	527,738
Loss from operations	(84,105)	(89,677)	(106,209)
Interest income	9,337	16,507	5,082
Interest expense	(4,244)	(1,565)	(979)
Provision for income taxes	688	526	87
Net income (loss)	(79,700)	(75,261)	(102,193)
Marketplace and service
Segment Reporting Information [Line Items]
Total revenue	572,971	422,527	361,585
Less:
Cost of revenue (excluding depreciation & amortization)	248,210	192,707	183,968
Marketplace and service | ACV Segment
Less:
Cost of revenue (excluding depreciation & amortization)	248,210	192,707	183,968
Customer assurance
Segment Reporting Information [Line Items]
Total revenue	64,185	58,707	59,944
Less:
Cost of revenue (excluding depreciation & amortization)	56,231	51,747	52,685
Customer assurance | ACV Segment
Less:
Cost of revenue (excluding depreciation & amortization)	$ 56,231	$ 51,747	$ 52,685