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Revenue and Other Information (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Product Information [Line Items]        
Revenue $ 37,903 $ 28,162 $ 105,906 $ 77,576
Core solutions        
Product Information [Line Items]        
Revenue 14,670 11,302 41,682 31,637
Value plus services        
Product Information [Line Items]        
Revenue 21,752 15,684 60,053 42,338
Other        
Product Information [Line Items]        
Revenue $ 1,481 $ 1,176 $ 4,171 $ 3,601
Minimum | Core solutions        
Product Information [Line Items]        
Subscriptions revenue recognition term     1 month  
Maximum | Core solutions        
Product Information [Line Items]        
Subscriptions revenue recognition term     1 year