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BASIC AND DILUTED LOSS PER COMMON SHARE - Schedule of Weighted Average Shares (Details) - shares | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |
Issued common shares at beginning of period (in shares) |  |  |  | 91,445,066 | 91,445,066 | 74,366,824 | 66,205,153
Effect of share options exercised |  |  |  |  | 45,040 | 115,330 | 0
Effect of shares issued for settlement of vesting of restricted share units |  |  |  |  | 786,746 | 829,610 | 831,393
Effect of shares issued for exercise of share purchase warrants |  |  |  |  | 1,057 | 44,185 | 0
Shares issued for consulting services |  |  |  |  | 46,067 | 122,854 | 0
Effect of shares issued in asset acquisitions |  |  |  |  | 0 | 419,986 | 0
Effect of shares issued for conversion of Convertible Debentures |  |  |  |  | 0 | 323 | 0
Effect of shares issued to settle liabilities |  |  |  |  | 141,525 | 0 | 0
Weighted average shares outstanding | 99,668,611 | 96,840,539 | 93,920,953 | 92,152,844 | 95,665,367 | 83,475,400 | 70,859,107
Public Offerings |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |
Effect of shares issued in public offerings |  |  |  |  | 3,199,866 | 7,576,288 | 3,822,561

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