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Segment Information (Details)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
segment
person
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Revenues from External Customers and Long-Lived Assets [Line Items]          
Number of business activities | segment     1    
Number of segment managers | person     0    
Revenues $ 42,720 $ 41,566 $ 127,660 $ 118,454  
Property and equipment-net 8,781   8,781   $ 5,503
United States          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Revenues 18,396 20,292 58,251 57,587  
International          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Revenues 24,324 21,274 69,409 60,867  
Sales Revenue, Net | Germany | Geographic Concentration Risk [Member]          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Revenues $ 5,000 $ 5,400 $ 16,300 $ 15,100  
Concentration risk, percentage 12.00% 13.00% 13.00% 13.00%  
Net Property and Equipment | India | Geographic Concentration Risk [Member]          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Concentration risk, percentage     26.00%   24.00%
Property and equipment-net $ 2,300   $ 2,300   $ 1,300