REVENUE Revenue by Type (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)
Revenue from Contract with Customer [Abstract]
Number of reportable segments			1
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 94,876	$ 79,281	$ 189,240	$ 165,734
Products and solutions net revenues
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	37,178		70,445
Subscription services
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	21,508	16,427	46,376	30,385
Maintenance
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	30,443	30,570	60,295	62,364
Professional services, training and other services
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 5,747	$ 4,649	$ 12,124	$ 10,639