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Acquisition of Mercent Corporation - Summary of Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Jan. 08, 2015
Business Acquisition [Line Items]      
Goodwill $ 21,410 $ 21,410  
Mercent      
Business Acquisition [Line Items]      
Cash     $ 41
Accounts receivable     2,559
Prepaid expenses     87
Property and equipment     336
Deferred tax assets     3,580
Goodwill     12,390
Accounts payable and accrued expenses     2,015
Deferred revenue     212
Recognized assets and liabilities acquired     20,266
Mercent | Customer relationships      
Business Acquisition [Line Items]      
Finite-lived intangibles     2,000
Mercent | Developed software technology      
Business Acquisition [Line Items]      
Finite-lived intangibles     $ 1,500