Property, Plant and Equipment, net - Components of Property, Plant and Equipment, Net, Excluding Discontinued Operations (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 33,720	$ 32,209
Less accumulated depreciation	(19,864)	(17,858)
Property, plant and equipment, net	13,856	14,351
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	199	199
Building and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	7,805	6,983
Rental property
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	2,749	2,749
Software
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	12,099	12,099
Furniture and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	10,198	9,675
Construction in process
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 670	$ 504