Property, Plant, and Equipment - Property, Plant and Equipment by Classification (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 221,906	$ 203,000
Less accumulated depreciation and amortization	(65,010)	(63,859)
Property, plant and equipment, net	$ 156,896	139,141
Luverne Facility retrofit asset
Property, Plant and Equipment [Line Items]
Useful Life (in years)	20 years
Property, plant and equipment, gross	$ 70,820	70,820
Plant machinery and equipment
Property, Plant and Equipment [Line Items]
Useful Life (in years)	10 years
Property, plant and equipment, gross	$ 17,949	17,949
Site improvements
Property, Plant and Equipment [Line Items]
Useful Life (in years)	10 years
Property, plant and equipment, gross	$ 7,157	7,157
Lab equipment, furniture and fixtures and vehicles
Property, Plant and Equipment [Line Items]
Useful Life (in years)	5 years
Property, plant and equipment, gross	$ 6,813	6,811
Demonstration plant
Property, Plant and Equipment [Line Items]
Useful Life (in years)	2 years
Property, plant and equipment, gross	$ 3,597	3,597
Buildings
Property, Plant and Equipment [Line Items]
Useful Life (in years)	10 years
Property, plant and equipment, gross	$ 2,543	2,543
Leasehold improvements, pilot plant, land and support equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 2,841	2,802
Leasehold improvements, pilot plant, land and support equipment \| Minimum
Property, Plant and Equipment [Line Items]
Useful Life (in years)	2 years
Leasehold improvements, pilot plant, land and support equipment \| Maximum
Property, Plant and Equipment [Line Items]
Useful Life (in years)	7 years
Computer, office equipment and software
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 2,338	2,332
Computer, office equipment and software \| Minimum
Property, Plant and Equipment [Line Items]
Useful Life (in years)	3 years
Computer, office equipment and software \| Maximum
Property, Plant and Equipment [Line Items]
Useful Life (in years)	6 years
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 107,848	$ 88,989

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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