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Property and Equipment, Net - Property and Equipment, Net (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]    
Total cost of property and equipment $ 939 $ 313
Less: accumulated depreciation (105) (12)
Property and equipment, net 834 301
Computer and Network Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Total cost of property and equipment 466 282
Furniture, Fixtures and Office Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Total cost of property and equipment 439 $ 31
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Total cost of property and equipment $ 34