Total long-lived assets of the company excluding goodwill and intangible assets.

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Minimum percentage of revenue not attained by any individual country other than the country of domicile.

+ References

No definition available.

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- Definition

Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(a))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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- Definition

Aggregate revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 225
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-Section S99
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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PRODUCT AND GEOGRAPHIC INFORMATION (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting, Revenue Reconciling Item [Line Items]
Products									$ 205,107	$ 209,461	$ 283,110
Services									208,175	209,542	228,820
Total net revenues	$ 112,684	$ 104,046	$ 98,615	$ 97,937	$ 107,258	$ 105,265	$ 102,373	$ 104,107	$ 413,282	419,003	511,930
Minimum percentage of revenue not attained by any individual country other than the country of domicile									10.00%
Long-lived assets	31,014				32,718				$ 31,014	32,718
United States [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total net revenues									150,877	161,155	186,658
Long-lived assets	23,774				24,292				23,774	24,292
Other Americas [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total net revenues									27,494	27,031	38,824
Europe, Middle East and Africa [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total net revenues									172,238	163,059	206,605
Asia-Pacific [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total net revenues									62,673	67,758	79,843
Other Countries [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Long-lived assets	$ 7,240				$ 8,426				7,240	8,426
Video products and solutions net revenues [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Products									132,276	114,787	155,408
Audio products and solutions net revenues [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Products									72,831	94,674	127,702
Subscription Arrangement [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Products									35,888	20,118	10,409
Nonsoftware Service, Support and Maintenance Arrangement [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Products									139,205	159,533	181,475
611710 Educational Support Services [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Products									$ 33,082	$ 29,891	$ 36,936