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BASIC AND DILUTED LOSS PER COMMON SHARE - Schedule of Weighted Average Shares (Details) - shares
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]      
Issued common shares at beginning of period (in shares) 134,311,033 100,735,889 91,445,066
Effect of stock options exercised 474,072 12,934 45,040
Effect of shares issued for settlement of vesting of restricted stock units 443,364 452,932 786,746
Effect of shares issued for settlement of exercises of stock appreciation rights 2,316 0 0
Effect of shares issued for exercise of share purchase warrants 1,737,981 0 1,057
Shares issued for consulting services 35,933 74,672 46,067
Effect of shares issued to settle liabilities 0 0 141,525
Basic weighted average number of common shares outstanding (in shares) 146,904,524 121,168,136 95,665,367
Public Offerings      
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]      
Effect of shares issued in public offerings 9,899,825 19,891,709 3,199,866