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Property and Equipment - Summary of Property and Equipment (Detail) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 16,683 $ 16,436
Less accumulated depreciation 5,817 4,791
Property and equipment, net 10,866 11,645
Furniture and Fixtures [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 203 203
Laboratory Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 9,529 9,425
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 4,686 4,686
Computer Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 436 428
Computer Software [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 541 372
Construction in Progress [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 1,288 $ 1,322