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Property and Equipment, Net - Summary of Property and Equipment, Net (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Property and equipment, Gross $ 22,822 $ 16,367
Less: accumulated depreciation and amortization (9,310) (6,951)
Property and equipment, net 78,723 31,066
Laboratory equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, Gross 11,466 7,572
Furniture and fixtures [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, Gross 3,840 1,494
Leasehold improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, Gross 3,640 3,425
Buildings [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, Gross 3,876 3,876
Construction in progress [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, net $ 65,211 $ 21,650