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Acquisition - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 06, 2015
Nov. 20, 2014
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Business Acquisition [Line Items]          
Asset impairment charges     $ 520 $ 2,087 $ 355
ADA Analytics Israel, LLC          
Business Acquisition [Line Items]          
Cash paid $ 2,360 $ 200      
Cash paid to acquire business, VAT tax 400        
Contingent consideration, liability $ 500        
Asset impairment charges       $ 1,900