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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Disaggregation of Revenue [Line Items]
Revenue	$ 79,549	$ 76,053	$ 238,492	$ 226,286
Subscription and support:
Disaggregation of Revenue [Line Items]
Revenue	75,095	72,264	223,739	215,322
Subscription and support: | United States
Disaggregation of Revenue [Line Items]
Revenue	54,054	50,866	158,394	154,683
Subscription and support: | United Kingdom
Disaggregation of Revenue [Line Items]
Revenue	9,939	11,886	31,649	33,938
Subscription and support: | Canada
Disaggregation of Revenue [Line Items]
Revenue	4,625	3,355	13,520	10,317
Subscription and support: | Other International
Disaggregation of Revenue [Line Items]
Revenue	6,477	6,157	20,176	16,384
Perpetual license:
Disaggregation of Revenue [Line Items]
Revenue	1,684	684	5,320	1,451
Perpetual license: | United States
Disaggregation of Revenue [Line Items]
Revenue	1,110	628	2,581	1,219
Perpetual license: | United Kingdom
Disaggregation of Revenue [Line Items]
Revenue	51	0	342	11
Perpetual license: | Canada
Disaggregation of Revenue [Line Items]
Revenue	10	1	187	53
Perpetual license: | Other International
Disaggregation of Revenue [Line Items]
Revenue	513	55	2,210	168
Professional services:
Disaggregation of Revenue [Line Items]
Revenue	2,770	3,105	9,433	9,513
Professional services: | United States
Disaggregation of Revenue [Line Items]
Revenue	1,673	2,014	5,121	6,208
Professional services: | United Kingdom
Disaggregation of Revenue [Line Items]
Revenue	442	753	1,901	2,219
Professional services: | Canada
Disaggregation of Revenue [Line Items]
Revenue	189	117	647	309
Professional services: | Other International
Disaggregation of Revenue [Line Items]
Revenue	$ 466	$ 221	$ 1,764	$ 777

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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