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Property and Equipment, net - Summary of Property and Equipment, Net (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]    
Total property and equipment, gross $ 56,547 $ 43,376
Accumulated depreciation (18,623) (12,046)
Total property and equipment, net 37,924 31,330
Computer Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Total property and equipment, gross 727 727
Furniture, Fixtures and Other [Member]    
Property, Plant and Equipment [Line Items]    
Total property and equipment, gross 3,416 3,215
Laboratory Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Total property and equipment, gross 23,895 16,640
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Total property and equipment, gross 25,473 21,400
Construction Work in Process [Member]    
Property, Plant and Equipment [Line Items]    
Total property and equipment, gross $ 3,036 $ 1,394