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Property and Equipment, Net (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Property, Plant and Equipment    
Less: accumulated depreciation $ (16,409) $ (14,663)
Total property and equipment, net 33,543 38,046
Lab equipment    
Property, Plant and Equipment    
Property and equipment, gross 23,774 23,491
Office equipment    
Property, Plant and Equipment    
Property and equipment, gross 3,122 2,928
Furniture and fixtures    
Property, Plant and Equipment    
Property and equipment, gross 1,350 1,340
Leasehold improvements    
Property, Plant and Equipment    
Property and equipment, gross 10,374 10,629
Assets under construction    
Property, Plant and Equipment    
Property and equipment, gross $ 11,332 $ 14,321