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Summary of Significant Accounting Policies - Estimated Useful Lives of Property and Equipment (Detail)
12 Months Ended
Dec. 31, 2015
Computer and Network Equipment [Member] | Minimum [Member]  
Property, Plant and Equipment [Line Items]  
Estimated life of property and equipment 5 years
Computer and Network Equipment [Member] | Maximum [Member]  
Property, Plant and Equipment [Line Items]  
Estimated life of property and equipment 7 years
Furniture, Fixtures and Office Equipment [Member] | Minimum [Member]  
Property, Plant and Equipment [Line Items]  
Estimated life of property and equipment 3 years
Furniture, Fixtures and Office Equipment [Member] | Maximum [Member]  
Property, Plant and Equipment [Line Items]  
Estimated life of property and equipment 5 years
Leasehold Improvements [Member] | Minimum [Member]  
Property, Plant and Equipment [Line Items]  
Estimated life of property and equipment 4 years
Leasehold Improvements [Member] | Maximum [Member]  
Property, Plant and Equipment [Line Items]  
Estimated life of property and equipment 7 years