REVENUE Revenue by Geographic Regions (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 90,431	$ 93,461	$ 256,165	$ 295,481
United States
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	36,190	31,267	105,166	110,697
Other Americas
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	4,505	9,471	15,841	23,232
Europe, Middle East and Africa
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	37,537	40,579	99,478	115,171
Asia-Pacific
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 12,199	$ 12,144	$ 35,680	$ 46,381