Inventory (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Inventory
Inventory, Net, Total	$ 3,345	$ 5,168
Inventory Valuation Reserves	0
In Process Inventory [Member]
Inventory
Inventory, Net, Total	994	2,084
Plant Inventory [Member]
Inventory
Inventory, Net, Total	742	882
Conversion Facility Inventory [Member]
Inventory
Inventory, Net, Total	$ 1,609	$ 2,202