Plant, Equipment, Leasehold Improvements and Operating Lease Right-of-use Assets (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Plant, Equipment and Leasehold Improvements
Plant, equipment and leasehold improvements, gross	$ 80,577	$ 92,856
Less accumulated depreciation	(44,801)	(53,746)
Operating lease right-of-use assets, net of amortization	6,312
Total financing leases in property, equipment and leasehold improvements, net	42,088	39,110
Depreciation	12,384	13,749
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	52,212	62,067
Machinery and equipment under financing leases
Plant, Equipment and Leasehold Improvements
Plant, equipment and leasehold improvements, gross	8,256	1,812
Furniture, fixtures and computer equipment
Plant, Equipment and Leasehold Improvements
Plant, equipment and leasehold improvements, gross	4,749	7,730
Leasehold improvements
Plant, Equipment and Leasehold Improvements
Plant, equipment and leasehold improvements, gross	14,905	19,651
Construction in progress
Plant, Equipment and Leasehold Improvements
Plant, equipment and leasehold improvements, gross	$ 455	$ 1,596

Amount of lessee's right to use underlying asset under operating lease net of amortization.

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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