Revenue and Related Matters -Disaggregated Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Disaggregation of Revenue [Line Items]
Subscription, transaction, and services	$ 37,049	$ 33,119
Subscription and transaction fees
Disaggregation of Revenue [Line Items]
Subscription, transaction, and services	34,102	30,183
Services and other
Disaggregation of Revenue [Line Items]
Subscription, transaction, and services	$ 2,947	$ 2,936