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ACQUISITION OF URANERZ ENERGY CORPORATION (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 18, 2015 | Dec. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Business Acquisition [Line Items] |  |  |  |  |
Acquisition related costs |  |  | $ 0 | $ 3,928 | $ 0
Value assigned of equity interest issued |  |  | $ 479 | $ 0 | $ 0
Uranerz Energy Corporation |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Percentage of voting interests acquired | 100.00% |  |  |  |
Number of shares received per common stock of Uranrez held (in shares) | 0.255 |  |  |  |
Share price (in dollars per share) | $ 4.16 |  |  |  |
Total purchase price | $ 106,340 |  |  |  |
Acquisition related costs |  | $ 6,890 |  |  |
Cash costs |  | $ 2,960 |  |  |
Shares issued for consulting services (in shares) | 617,832 | 889,436 |  |  |
Value assigned of equity interest issued | $ 2,570 | $ 3,930 |  |  |

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