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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