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SUBSEQUENT EVENTS - (Details) - USD ($) $ in Thousands |  | 1 Months Ended | 3 Months Ended |
--- | --- | --- | --- | ---
May 02, 2018 | May 02, 2018 | Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Subsequent Event [Line Items] |  |  |  |  |
Common stock, shares, issued (in shares) |  |  | 75,977,269 |  | 74,366,824
Proceeds from issuance of shares |  |  | $ 1,147 | $ 6,965 |
ATM | Subsequent Event |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Common stock, shares, issued (in shares) | 2,100,000 | 2,100,000 |  |  |
Proceeds from issuance of shares |  | $ 3,900 |  |  |
Uranium Energy Corp | Subsequent Event |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Consideration transferred | $ 5,390 |  |  |  |
Other Payments to Acquire Businesses | 2,940 |  |  |  |
Equity interests | $ 2,450 |  |  |  |

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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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