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Balance Sheet Components - Schedule of Property and Equipment, Net (Detail) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Property, Plant and Equipment [Line Items]    
Total property and equipment $ 39,609 $ 37,797
Less accumulated depreciation and amortization (11,230) (10,072)
Property and equipment, net 28,379 27,725
Computer equipment and software    
Property, Plant and Equipment [Line Items]    
Total property and equipment 765 599
Laboratory equipment    
Property, Plant and Equipment [Line Items]    
Total property and equipment 9,639 9,354
Furniture and fixtures    
Property, Plant and Equipment [Line Items]    
Total property and equipment 1,259 1,259
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Total property and equipment 24,702 24,631
Construction in progress    
Property, Plant and Equipment [Line Items]    
Total property and equipment $ 3,244 $ 1,954