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Property and Equipment, Net (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Property, Plant and Equipment    
Less: accumulated depreciation $ (20,549) $ (14,663)
Total property and equipment, net 33,962 38,046
Lab equipment    
Property, Plant and Equipment    
Property and equipment, gross 33,073 23,491
Office equipment    
Property, Plant and Equipment    
Property and equipment, gross 3,144 2,928
Furniture and fixtures    
Property, Plant and Equipment    
Property and equipment, gross 1,318 1,340
Leasehold improvements    
Property, Plant and Equipment    
Property and equipment, gross 14,837 10,629
Assets under construction    
Property, Plant and Equipment    
Property and equipment, gross $ 2,139 $ 14,321