Inventory (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Inventory
Inventory, Net, Total	$ 4,109	$ 3,345
Inventory Valuation Reserves	0
In Process Inventory [Member]
Inventory
Inventory, Net, Total	897	994
Plant Inventory [Member]
Inventory
Inventory, Net, Total	461	742
Conversion Facility Inventory [Member]
Inventory
Inventory, Net, Total	$ 2,751	$ 1,609