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SUBSEQUENT EVENTS - (Details) - Wyoming - Subsequent Event
shares in Thousands, $ in Thousands
Nov. 01, 2017
USD ($)
shares
Subsequent Event [Line Items]  
Consideration transferred in the sale of non-core uranium properties $ 5,390
Cash paid in the sale of non-core uranium properties $ 2,940
Number of shares issued in the sale of non-core uranium properties | shares 2,450