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Plant, Equipment, Leasehold Improvements and Operating Lease Right-of-Use Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Plant, Equipment and Leasehold Improvements    
Plant, equipment and leasehold improvements, gross $ 87,312 $ 80,577
Less accumulated depreciation an amortization (55,092) (45,277)
Operating lease right-of-use assets, net of accumulated amortization 7,183 6,312
Total property, equipment and leasehold improvements, net 39,403 41,612
Depreciation 12,232 12,616
Impairments of the Company's plant, equipment, and leasehold improvement assets 0 0
Machinery and equipment    
Plant, Equipment and Leasehold Improvements    
Plant, equipment and leasehold improvements, gross 55,459 52,212
Machinery and equipment under financing leases    
Plant, Equipment and Leasehold Improvements    
Plant, equipment and leasehold improvements, gross 9,974 8,256
Furniture, fixtures and computer equipment    
Plant, Equipment and Leasehold Improvements    
Plant, equipment and leasehold improvements, gross 4,410 4,749
Leasehold improvements    
Plant, Equipment and Leasehold Improvements    
Plant, equipment and leasehold improvements, gross 15,083 14,905
Construction in progress    
Plant, Equipment and Leasehold Improvements    
Plant, equipment and leasehold improvements, gross $ 2,386 $ 455