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Segment Information (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
person
Dec. 31, 2015
USD ($)
segment
Dec. 31, 2014
USD ($)
Revenues from External Customers and Long-Lived Assets [Line Items]      
Number of business activities | segment   1  
Number of segment managers | person 0    
Revenues $ 163,926 $ 149,298 $ 132,295
Property and equipment-net 5,503 6,572  
United States      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 77,039 74,235 72,124
International      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues $ 86,887 $ 75,063 $ 60,171
Sales Revenue, Net      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Concentration risk, percentage 16.00% 17.00% 22.00%
Sales Revenue, Net | United States | Geographic Concentration Risk [Member] | Minimum      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Concentration risk, percentage 10.00% 10.00% 10.00%
Sales Revenue, Net | Germany | Geographic Concentration Risk [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues $ 21,300    
Concentration risk, percentage 13.00%    
Net Property and Equipment | India | Geographic Concentration Risk [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Concentration risk, percentage 24.00% 22.00%  
Property and equipment-net $ 1,300 $ 1,400