Property and Equipment, net - Schedule of Property and Equipment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]    
Property and Equipment, gross $ 654 $ 91
Less: Accumulated depreciation (165) (58)
Property and Equipment, net 489 33
Lab Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and Equipment, gross 322  
Computer Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and Equipment, gross 243 $ 91
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and Equipment, gross 66  
Furniture and Fixtures [Member]    
Property, Plant and Equipment [Line Items]    
Property and Equipment, gross $ 23