v3.8.0.1

SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Sales Revenue, Net | Customer One | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk percentage	10.10%	10.70%	10.40%
Sales Revenue, Net | Customer Two | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk percentage	10.10%	10.10%
International
Concentration Risk [Line Items]
Deferred revenue	$ 1,654	$ 1,660
Inventories, net	$ 1,047	$ 924

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