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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, 2018
Dec. 31, 2017
Dec. 31, 2016
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       74,366,824 66,205,153 46,519,132  
Number of exercises in period (in shares)           115,330 0 3,471  
Effect of shares issued for settlement of vesting of restricted share units (in shares)           829,610 831,393 196,242  
Stock Issued For Exercise Of Warrants           44,185 0 0  
Shares issued for exercise of share purchase warrants (in shares)           323 0 0  
Shares issued for consulting services (in shares)           122,854 0 0  
Effect of shares issued in asset acquisitions (in shares)           419,986 0 3,184,175  
Weighted average shares outstanding (in shares)   72,165,000 71,436,000 70,424,000 68,761,000 83,475,400 70,859,107 56,441,058  
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         7,576,288 3,822,561 6,538,038