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Significant Accounting Policies (Details )
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Sep. 30, 2014
USD ($)
Jun. 30, 2014
USD ($)
Mar. 31, 2014
USD ($)
Dec. 31, 2015
USD ($)
item
Dec. 31, 2014
USD ($)
item
Dec. 31, 2013
USD ($)
Concentration of Credit Risk                      
Revenue $ 43,252 $ 37,092 $ 35,238 $ 34,612 $ 30,756 $ 28,407 $ 24,744 $ 26,332 $ 150,194 $ 110,239 $ 83,127
Client A                      
Concentration of Credit Risk                      
Revenue                 65,200 61,100 57,300
Client B                      
Concentration of Credit Risk                      
Revenue                 23,800 15,900 13,500
Client C                      
Concentration of Credit Risk                      
Revenue                 $ 17,600 $ 14,600 $ 10,400
Revenue | Customer concentration risk | Client A                      
Concentration of Credit Risk                      
Percentage of concentration of credit risk                 43.00% 55.00% 69.00%
Revenue | Customer concentration risk | Client B                      
Concentration of Credit Risk                      
Percentage of concentration of credit risk                 16.00% 14.00% 16.00%
Revenue | Customer concentration risk | Client C                      
Concentration of Credit Risk                      
Percentage of concentration of credit risk                 12.00% 13.00% 12.00%
Accounts receivable | Credit concentration risk                      
Concentration of Credit Risk                      
Percentage of concentration of credit risk                 7.00% 35.00%  
Number of additional clients who accounted for more than 10% | item                 1 2