Property and Equipment - Components of Property and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Components of Property, Plant and Equipment
Property and equipment	$ 19,878	$ 20,541
Less accumulated depreciation	(12,109)	(11,454)
Property and equipment, net	7,769	9,087
Land
Components of Property, Plant and Equipment
Property and equipment	1,986	2,415
Land improvements
Components of Property, Plant and Equipment
Property and equipment	861	867
Buildings and leasehold improvements
Components of Property, Plant and Equipment
Property and equipment	6,364	6,364
Machinery and equipment
Components of Property, Plant and Equipment
Property and equipment	7,753	7,760
Furniture and fixtures
Components of Property, Plant and Equipment
Property and equipment	649	649
Transportation equipment
Components of Property, Plant and Equipment
Property and equipment	1,043	1,190
Computer equipment and software
Components of Property, Plant and Equipment
Property and equipment	$ 1,222	$ 1,296