Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Total revenue	$ 112,693	$ 88,099	$ 322,502	$ 257,760
Subscription and support
Disaggregation of Revenue [Line Items]
Total revenue	98,912	75,850	275,053	214,907
XBRL professional services
Disaggregation of Revenue [Line Items]
Total revenue	9,003	7,798	33,558	29,543
Other services
Disaggregation of Revenue [Line Items]
Total revenue	4,778	4,451	13,891	13,310
Information technology
Disaggregation of Revenue [Line Items]
Total revenue	16,097	11,983	44,953	34,264
Diversified financials
Disaggregation of Revenue [Line Items]
Total revenue	13,538	10,665	38,094	31,232
Consumer discretionary
Disaggregation of Revenue [Line Items]
Total revenue	12,148	9,748	34,019	28,497
Healthcare
Disaggregation of Revenue [Line Items]
Total revenue	11,860	8,772	34,003	25,517
Industrials
Disaggregation of Revenue [Line Items]
Total revenue	11,826	9,365	33,739	27,768
Banks
Disaggregation of Revenue [Line Items]
Total revenue	9,940	8,959	30,247	25,914
Insurance
Disaggregation of Revenue [Line Items]
Total revenue	7,547	5,828	22,106	17,173
Energy
Disaggregation of Revenue [Line Items]
Total revenue	6,818	5,812	20,178	17,793
Utilities
Disaggregation of Revenue [Line Items]
Total revenue	6,040	3,538	16,795	10,707
Real estate
Disaggregation of Revenue [Line Items]
Total revenue	4,608	3,769	13,727	11,810
Materials
Disaggregation of Revenue [Line Items]
Total revenue	4,570	3,824	13,040	10,735
Other
Disaggregation of Revenue [Line Items]
Total revenue	$ 7,701	$ 5,836	$ 21,601	$ 16,350