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Geographic Information and Major Clients - Additional Information (Detail)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
Customer
Jun. 30, 2016
Customer
Jun. 30, 2017
Segment
Unit
Customer
Jun. 30, 2016
Customer
Dec. 31, 2016
Customer
Geographic information and major clients          
Number of reportable segment, customer engagement solutions | Segment     1    
Number of reporting unit | Unit     1    
Number of clients representing 10% or more of Company's total revenue 0 0 0 0  
Number of clients representing 10% or more of Company's total outstanding trade receivables     0   0
Clients accounting for 10% or more of total revenue or outstanding trade receivables     No client accounted for 10% or more of the Company’s total revenue during the three and six months ended June 30, 2017 and 2016. No client accounted for 10% or more of the Company’s total outstanding trade receivables as of June 30, 2017 or December 31, 2016.    
Credit Concentration Risk | Total Revenue | Minimum          
Geographic information and major clients          
Concentration risk, percentage 10.00% 10.00% 10.00% 10.00%  
Credit Concentration Risk | Trade Receivables | Minimum          
Geographic information and major clients          
Concentration risk, percentage     10.00%   10.00%