PRODUCT AND GEOGRAPHIC INFORMATION (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting, Revenue Reconciling Item [Line Items]
Products									$ 336,371	$ 378,627	$ 395,531
Services									169,224	151,624	167,881
Total net revenues	$ 138,806	$ 137,436	$ 109,767	$ 119,586	$ 128,196	$ 142,429	$ 124,644	$ 134,982	505,595	530,251	563,412
Long-lived assets	42,604				34,410				42,604	34,410
United States [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total net revenues									185,109	193,060	218,154
Long-lived assets	30,684				30,465				30,684	30,465
Other Americas [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total net revenues									37,081	45,342	43,131
Europe, Middle East and Africa [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total net revenues									206,192	217,767	214,441
Asia-Pacific [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total net revenues									77,213	74,082	87,686
Other Countries [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Long-lived assets	$ 11,920				$ 3,945				11,920	3,945
Video products and solutions net revenues [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Products									201,559	233,464	243,173
Audio products and solutions net revenues [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Products									$ 134,812	$ 145,163	$ 152,358