Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Net property, plant and equipment	$ 26,346	$ 35,409
Turkey [Member]
Net property, plant and equipment	8	17,979
Texas [Member]
Net property, plant and equipment	9,372	9,413
Alabama [Member]
Net property, plant and equipment	8,973
New Mexico [Member]
Net property, plant and equipment	7,806	7,806
Corporate [Member]
Net property, plant and equipment	187	211
Uranium Plant [Member]
Net property, plant and equipment	8,303	8,304
Uranium Plant [Member] | Turkey [Member]
Net property, plant and equipment
Uranium Plant [Member] | Texas [Member]
Net property, plant and equipment	8,303	8,304
Uranium Plant [Member] | Alabama [Member]
Net property, plant and equipment
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 [Member]
Net property, plant and equipment	16,778	25,774
Mineral Rights and Properties [Member] | Turkey [Member]
Net property, plant and equipment		17,968
Mineral Rights and Properties [Member] | Texas [Member]
Net property, plant and equipment
Mineral Rights and Properties [Member] | Alabama [Member]
Net property, plant and equipment	8,972
Mineral Rights and Properties [Member] | New Mexico [Member]
Net property, plant and equipment	7,806	7,806
Mineral Rights and Properties [Member] | Corporate [Member]
Net property, plant and equipment
Other Property Plant and Equipment [Member]
Net property, plant and equipment	1,265	1,331
Other Property Plant and Equipment [Member] | Turkey [Member]
Net property, plant and equipment	8	11
Other Property Plant and Equipment [Member] | Texas [Member]
Net property, plant and equipment	1,069	1,109
Other Property Plant and Equipment [Member] | Alabama [Member]
Net property, plant and equipment	1
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	$ 187	$ 211