Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Net property, plant and equipment	$ 35,409	$ 46,916
Turkey [Member]
Net property, plant and equipment	17,979	17,990
Texas [Member]
Net property, plant and equipment	9,413	9,683
New Mexico [Member]
Net property, plant and equipment	7,806	19,102
Corporate [Member]
Net property, plant and equipment	211	141
Uranium Plant [Member]
Net property, plant and equipment	8,304	8,459
Uranium Plant [Member] | Turkey [Member]
Net property, plant and equipment
Uranium Plant [Member] | Texas [Member]
Net property, plant and equipment	8,304	8,459
Uranium Plant [Member] | New Mexico [Member]
Net property, plant and equipment
Uranium Plant [Member] | Corporate [Member]
Net property, plant and equipment
Mineral Rights and Properties Uranium [Member]
Net property, plant and equipment	25,774	37,070
Mineral Rights and Properties Uranium [Member] | Turkey [Member]
Net property, plant and equipment	17,968	17,968
Mineral Rights and Properties Uranium [Member] | Texas [Member]
Net property, plant and equipment
Mineral Rights and Properties Uranium [Member] | New Mexico [Member]
Net property, plant and equipment	7,806	19,102
Mineral Rights and Properties Uranium [Member] | Corporate [Member]
Net property, plant and equipment
Other Property Plant and Equipment [Member]
Net property, plant and equipment	1,331	1,387
Other Property Plant and Equipment [Member] | Turkey [Member]
Net property, plant and equipment	11	22
Other Property Plant and Equipment [Member] | Texas [Member]
Net property, plant and equipment	1,109	1,224
Other Property Plant and Equipment [Member] | New Mexico [Member]
Net property, plant and equipment
Other Property Plant and Equipment [Member] | Corporate [Member]
Net property, plant and equipment	$ 211	$ 141