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Property and Equipment, Net (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Property, Plant and Equipment    
Less: accumulated depreciation $ (12,260) $ (8,565)
Total property and equipment, net 32,755 28,164
Lab equipment    
Property, Plant and Equipment    
Property, plant and equipment, gross 21,191 18,214
Office equipment    
Property, Plant and Equipment    
Property, plant and equipment, gross 2,505 2,211
Furniture and fixtures    
Property, Plant and Equipment    
Property, plant and equipment, gross 1,267 1,301
Leasehold improvements    
Property, Plant and Equipment    
Property, plant and equipment, gross 10,048 10,316
Assets under construction    
Property, Plant and Equipment    
Property, plant and equipment, gross $ 10,004 $ 4,687