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BASIC AND DILUTED LOSS PER COMMON SHARE - Schedule of Weighted Average Shares (Details) - shares |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Mar. 14, 2016 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Sep. 20, 2016
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Issued common shares at beginning of period (in shares) |  | 66,205,153 |  |  |  | 46,519,132 |  |  |  | 66,205,153 | 46,519,132 | 19,677,552 |
Number of exercises in period (in shares) |  |  |  |  |  |  |  |  |  | 0 | 3,471 | 22,938 |
Effect of shares issued for settlement of vesting of restricted share units (in shares) |  |  |  |  |  |  |  |  |  | 831,393 | 196,242 | 0 |
Shares issued for exercise of share purchase warrants (in shares) |  |  |  |  |  |  |  |  |  | 0 | 0 | 173 |
Share issued for property acquisitions (in shares) |  |  |  |  |  |  |  |  |  | 0 | 0 | 13,654,488 |
Effect of shares issued in asset acquisitions (in shares) |  |  |  |  |  |  |  |  |  | 0 | 3,184,175 | 0 |
Weighted average shares outstanding (in shares) |  | 74,367,000 | 71,963,000 | 70,567,000 | 70,220,000 | 66,205,153,000 | 58,630,457,000 | 53,043,512,000 | 47,660,414,000 | 70,859,107 | 56,441,058 | 33,383,972 |
Public Offerings |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Issued common shares at beginning of period (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 8,337,500
Effect of shares issued in transaction (in shares) | 5,031,250 |  |  |  |  |  |  |  |  | 3,822,561 | 6,538,038 | 28,821 |

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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Number of shares of stock issued during the period pursuant to acquisitions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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