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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Business Acquisition [Line Items] |  |  |  |  |
Acquisition related costs |  |  | $ 0 | $ 0 | $ 3,928
Value assigned of equity interest issued |  |  | $ 370 | $ 479 | $ 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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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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