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Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Property, plant and equipment                  
Property, plant, and equipment, gross $ 96,735 $ 32,376              
Less: accumulated depreciation (22,186) (17,417)              
Property plant, and equipment, net 74,549 14,959   $ 64,820 $ 60,018 $ 16,591 $ 14,990 $ 14,228 $ 13,615
Depreciation expense 4,800 3,600 $ 2,600            
Land                  
Property, plant and equipment                  
Property, plant, and equipment, gross 1,165                
Leasehold Improvements                  
Property, plant and equipment                  
Property, plant, and equipment, gross 1,121 862              
Software, machinery and equipment                  
Property, plant and equipment                  
Property, plant, and equipment, gross $ 94,449 $ 31,514