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Property and Equipment, Net - Schedule of Property and Equipment, Net (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Property Plant And Equipment [Line Items]    
Property and equipment, gross $ 18,306 $ 17,828
Less accumulated depreciation (5,017) (2,987)
Property and equipment, net 13,289 14,841
Laboratory Equipment    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 7,467 7,111
Computer and Office Equipment    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 840 781
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 9,514 9,484
Construction in Progress    
Property Plant And Equipment [Line Items]    
Property and equipment, gross $ 72 $ 39