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Property and Equipment - Schedule of Property and Equipment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]    
Total property and equipment $ 13,247 $ 13,202
Less: accumulated depreciation (9,387) (7,989)
Property and equipment, net 3,860 5,213
Office Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Total property and equipment 266 539
Laboratory Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Total property and equipment 4,443 4,337
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Total property and equipment 7,683 7,683
Construction in Progress [Member]    
Property, Plant and Equipment [Line Items]    
Total property and equipment 759 547
Software [Member]    
Property, Plant and Equipment [Line Items]    
Total property and equipment $ 96 $ 96