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Segment Reporting and Significant Customer Information - Revenue for Individual Countries that Exceed 10% of Total Revenue (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Revenue, Major Customer [Line Items]        
Total revenues $ 26,411 $ 29,798 $ 54,840 $ 60,626
United States        
Revenue, Major Customer [Line Items]        
Total revenues 15,244 16,585 31,469 33,378
United Kingdom        
Revenue, Major Customer [Line Items]        
Total revenues 4,703 5,908 9,623 12,524
GERMANY        
Revenue, Major Customer [Line Items]        
Total revenues 2,659 3,005 6,165 6,394
Rest of the world        
Revenue, Major Customer [Line Items]        
Total revenues $ 3,805 $ 4,300 $ 7,583 $ 8,330