Summary of Significant Accounting Policies - Additional information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) Segment	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Jan. 01, 2022 USD ($)	Dec. 31, 2020 USD ($)
Accounting Policies [Line Items]
Number of operating segments | Segment	1
Cash and cash equivalents	$ 54,224	$ 103,095
Sales credits and reserves	1,200	900
Allowances for expected credit losses	2,816	2,304	$ 2,949		$ 1,861
Cumulative translation adjustment gain (loss)	$ (2,900)	(5,600)
Percentage of cloud-hosted platform revenue processed	98.00%
Percentage of core platform revenue processed	80.00%
Advertising expenses	$ 1,500	2,100	2,200
Internally Developed Software Assets
Accounting Policies [Line Items]
Finite-lived intangible asset, useful life	3 years
Computers and equipment
Accounting Policies [Line Items]
Property and equipment, useful life	3 years
Minimum
Accounting Policies [Line Items]
Payment terms, period	30 days
Minimum | Stock options, restricted stock awards and restricted stock units | 2021 Equity Plan
Accounting Policies [Line Items]
Share-based compensation arrangement by share-based payment award, award vesting period	1 year
Minimum | Furniture and fixtures
Accounting Policies [Line Items]
Property and equipment, useful life	5 years
Maximum
Accounting Policies [Line Items]
Payment terms, period	60 days
Maximum | Stock options, restricted stock awards and restricted stock units | 2021 Equity Plan
Accounting Policies [Line Items]
Share-based compensation arrangement by share-based payment award, award vesting period	4 years
Maximum | Furniture and fixtures
Accounting Policies [Line Items]
Property and equipment, useful life	7 years
Cumulative Effect, Period of Adoption, Adjustment
Accounting Policies [Line Items]
Allowances for expected credit losses		$ 0	$ 254		$ 0
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13
Accounting Policies [Line Items]
Retained earnings				$ 300
Cost of Goods and Service Benchmark | Supplier Concentration Risk | NYOCA
Accounting Policies [Line Items]
Concentration risk, percentage	11.70%	11.80%
Outside US
Accounting Policies [Line Items]
Cash	$ 19,300	$ 28,000
Australia
Accounting Policies [Line Items]
Cash	6,200
India
Accounting Policies [Line Items]
Cash	$ 3,200	5,100
Canada
Accounting Policies [Line Items]
Cash		$ 9,200