Revenue and Related Matters -Disaggregated Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Subscription, transaction, and services	$ 131,574	$ 108,569	$ 96,460
Subscription and transaction
Disaggregation of Revenue [Line Items]
Subscription, transaction, and services	121,321	99,609	89,476
Services and other
Disaggregation of Revenue [Line Items]
Subscription, transaction, and services	$ 10,253	$ 8,960	$ 6,984