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Business Combination - Summary of Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Apr. 27, 2017
Dec. 31, 2016
Business Acquisition [Line Items]      
Goodwill $ 59,131   $ 45,347
Outbound Solutions Inc      
Business Acquisition [Line Items]      
Net tangible assets acquired   $ 96  
Net deferred tax liability recognized   (492)  
Goodwill   13,350  
Total purchase price   16,564  
Developed technology | Outbound Solutions Inc      
Business Acquisition [Line Items]      
Identifiable intangible assets:   3,200  
Customer relationships | Outbound Solutions Inc      
Business Acquisition [Line Items]      
Identifiable intangible assets:   $ 410