REVENUE Revenue by Type (Details) $ in Thousands	3 Months Ended
Mar. 31, 2022 USD ($)	Mar. 31, 2021 USD ($)
Revenue from Contract with Customer [Abstract]
Number of reportable segments	1
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 100,649	$ 94,364
Subscriptions
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	32,954	24,868
Maintenance
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 28,327	$ 29,852

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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+ Details