Property, Plant and Equipment, Net (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Property, Plant and Equipment, Net    
Property, plant and equipment, gross $ 64,922 $ 64,085
Less: Accumulated depreciation and amortization (11,629) (10,133)
Property, plant and equipment, net 53,293 53,952
Land    
Property, Plant and Equipment, Net    
Property, plant and equipment, gross 1,300 1,300
Manufacturing facility    
Property, Plant and Equipment, Net    
Property, plant and equipment, gross 30,969 30,969
Manufacturing equipment    
Property, Plant and Equipment, Net    
Property, plant and equipment, gross 8,773 8,782
Laboratory equipment    
Property, Plant and Equipment, Net    
Property, plant and equipment, gross 17,136 16,639
Computer equipment    
Property, Plant and Equipment, Net    
Property, plant and equipment, gross 2,212 2,118
Furniture and fixtures    
Property, Plant and Equipment, Net    
Property, plant and equipment, gross 1,228 1,228
Leasehold improvements    
Property, Plant and Equipment, Net    
Property, plant and equipment, gross 444 444
Construction-in-progress    
Property, Plant and Equipment, Net    
Property, plant and equipment, gross $ 2,860 $ 2,605