REVENUE (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)
Segment Reporting, Revenue Reconciling Item [Line Items]
Number of Reportable Segments	1
Revenues	$ 86,453	$ 103,319
Subscription Arrangement [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	13,958	9,282
Nonsoftware Service, Support and Maintenance Arrangement [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	31,794	32,019
611710 Educational Support Services [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	5,990	7,622
Product [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	34,711	54,396
Service [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	51,742	48,923
Americas [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	36,090	39,479
Other Americas [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	5,450	6,801
Europe, Middle East and Africa [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	33,235	37,153
Asia Pacific [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 11,678	$ 19,886