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ACQUISITION OF THE ALTA MESA ISR PROJECT - Purchase Price Allocation (Details) - USD ($) $ in Thousands |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 16, 2016 | Jun. 30, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Business Acquisition [Line Items] |  |  |  |  |
Acquisition related costs |  |  | $ 0 | $ 0 | $ 3,928
Alta Mesa I S R Project |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Issuance of 4,551,824 common shares | $ 11,378 |  |  |  |
Acquisition related costs | 1,290 | $ 1,290 |  |  |
Total purchase price | 12,668 |  |  |  |
Plant and equipment | 13,626 |  |  |  |
Inventories | 177 |  |  |  |
Restricted cash | 4,532 |  |  |  |
Accounts payable and accrued liabilities | (213) |  |  |  |
Asset retirement obligation | (5,454) |  |  |  |
Total purchase consideration | $ 12,668 |  |  |  |
Number of shares issued for acquisition (in shares) | 4,551,284 |  |  |  |

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