SUPPLEMENTAL FINANCIAL INFORMATION - Schedules of Components of Revenues (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016
Supplemental Financial Information [Line Items]
Revenue	$ 3,756	$ 17,996
Uranium concentrates
Supplemental Financial Information [Line Items]
Revenue	3,497	17,978
Alternate feed materials processing and other
Supplemental Financial Information [Line Items]
Revenue	$ 259	$ 18

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

Name:	us-gaap_Revenues
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration