PRODUCT AND GEOGRAPHIC INFORMATION (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Segment Reporting, Revenue Reconciling Item [Line Items]
Products and solutions net revenues	$ 54,319	$ 63,740	$ 152,980	$ 223,841
Services net revenues	50,946	55,279	158,765	172,794
Total net revenues	105,265	119,019	311,745	396,635
Video products and solutions net revenues [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Products and solutions net revenues	27,058	39,182	82,585	118,252
Audio products and solutions net revenues [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Products and solutions net revenues	27,261	24,558	70,395	105,589
United States [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total net revenues	38,624	45,982	121,309	145,384
Other Americas [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total net revenues	7,377	9,702	20,581	30,674
Europe, Middle East and Africa [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total net revenues	41,526	44,524	121,647	159,243
Asia-Pacific [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total net revenues	$ 17,738	$ 18,811	$ 48,208	$ 61,334