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Property and Equipment, Net - Schedule of Property and Equipment, Net (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Property Plant And Equipment [Line Items]    
Property and equipment, gross $ 18,018 $ 17,828
Less accumulated depreciation (3,670) (2,987)
Property and equipment, net 14,348 14,841
Laboratory Equipment    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 7,287 7,111
Computer and Office Equipment    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 829 781
Furniture and Fixtures    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 413 413
Leasehold Improvements    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 9,484 9,484
Construction in Progress    
Property Plant And Equipment [Line Items]    
Property and equipment, gross $ 5 $ 39