Summary of Significant Accounting Policies - PP&E, ARO and Other (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment
Construction in progress	$ 16,813	$ 45,555
Interest costs capitalized	0	0
Capitalized cost in accounts payable and accrued expenses	1,303	936
Impairment of long-lived assets	930
Asset Retirement Obligations
ARO included in other liabilities and accrued expenses	1,482	1,519
Amount of assets associated with AROs not fully depreciated	826
Amount spent on AROs	93	178
Accretion expense recognized on AROs	86	84	$ 73
Other Assets
Deferred financing costs	28	19
Other	395	530
Total	423	549
Environmental Expenditures
Capital expenditures related to environmental matters	1,156	$ 1,152	$ 440
Minimum
Asset Retirement Obligations
Estimated annual expenditures in years 2018 through 2022 relating to AROs	100
Maximum
Asset Retirement Obligations
Estimated annual expenditures in years 2018 through 2022 relating to AROs	$ 200
Buildings and building and leasehold improvements. | Minimum
Property, Plant and Equipment
Estimated useful lives of property, plant and equipment	3 years
Buildings and building and leasehold improvements. | Maximum
Property, Plant and Equipment
Estimated useful lives of property, plant and equipment	25 years
Machinery and equipment | Minimum
Property, Plant and Equipment
Estimated useful lives of property, plant and equipment	2 years
Machinery and equipment | Maximum
Property, Plant and Equipment
Estimated useful lives of property, plant and equipment	30 years
Furniture and fixtures | Minimum
Property, Plant and Equipment
Estimated useful lives of property, plant and equipment	3 years
Furniture and fixtures | Maximum
Property, Plant and Equipment
Estimated useful lives of property, plant and equipment	10 years
Automotive equipment. | Minimum
Property, Plant and Equipment
Estimated useful lives of property, plant and equipment	3 years
Automotive equipment. | Maximum
Property, Plant and Equipment
Estimated useful lives of property, plant and equipment	10 years