PRODUCT AND GEOGRAPHIC INFORMATION (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting, Revenue Reconciling Item [Line Items]
Products									$ 283,110	$ 336,371	$ 378,627
Services									228,820	169,224	151,624
Total net revenues	$ 115,295	$ 119,019	$ 134,069	$ 143,547	$ 138,806	$ 137,436	$ 109,767	$ 119,586	$ 511,930	505,595	530,251
Minimum percentage of revenue not attained by any individual country other than the country of domicile									10.00%
Long-lived assets	41,756				42,604				$ 41,756	42,604
United States [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total net revenues									186,658	185,109	193,060
Long-lived assets	29,970				30,684				29,970	30,684
Other Americas [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total net revenues									38,824	37,081	45,342
Europe, Middle East and Africa [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total net revenues									206,605	206,192	217,767
Asia-Pacific [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total net revenues									79,843	77,213	74,082
Other Countries [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Long-lived assets	$ 11,786				$ 11,920				11,786	11,920
Video products and solutions net revenues [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Products									155,408	201,559	233,464
Audio products and solutions net revenues [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Products									$ 127,702	$ 134,812	$ 145,163