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Property and Equipment, Net - Schedule of Property and Equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Property Plant And Equipment [Line Items]    
Property and equipment, at cost $ 64,074 $ 78,471
Less: accumulated depreciation (24,382) (18,116)
Property and equipment, net 39,692 60,355
Laboratory Equipment    
Property Plant And Equipment [Line Items]    
Property and equipment, at cost 27,767 20,773
Computer Equipment    
Property Plant And Equipment [Line Items]    
Property and equipment, at cost 3,600 2,450
Furniture and Office Equipment    
Property Plant And Equipment [Line Items]    
Property and equipment, at cost 2,717 1,568
Computer Software    
Property Plant And Equipment [Line Items]    
Property and equipment, at cost 860 505
Construction in Progress    
Property Plant And Equipment [Line Items]    
Property and equipment, at cost 7,185 1,852
Leasehold Improvements    
Property Plant And Equipment [Line Items]    
Property and equipment, at cost $ 21,945 14,716
Build-to-suit Asset Cost    
Property Plant And Equipment [Line Items]    
Property and equipment, at cost   $ 36,607