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Segment Information (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2017
USD ($)
segment
person
Mar. 31, 2016
USD ($)
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 $ 42,288 $ 38,007  
Property and equipment-net 5,189   $ 5,503
United States      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 20,091 18,405  
International      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues 22,197 19,602  
Sales Revenue, Net | Germany | Geographic Concentration Risk [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Revenues $ 5,500 $ 4,900  
Concentration risk, percentage 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 25.00%   24.00%
Property and equipment-net $ 1,300