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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, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Issued common shares at beginning of period (in shares)				100,735,889				91,445,066	100,735,889	91,445,066	74,366,824
Effect of share options exercised									12,934	45,040	115,330
Effect of shares issued for settlement of vesting of restricted share units									452,932	786,746	829,610
Effect of shares issued for exercise of share purchase warrants									0	1,057	44,185
Shares issued for consulting services									74,672	46,067	122,854
Effect of shares issued in asset acquisitions									0	0	419,986
Effect of shares issued for conversion of Convertible Debentures									0	0	323
Effect of shares issued to settle liabilities									0	141,525	0
Weighted average common shares outstanding	132,129,787	126,624,498	118,118,935	107,618,908	99,668,611	96,840,539	93,920,953	92,152,844	121,168,136	95,665,367	83,475,400
Public Offerings
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Effect of shares issued in public offerings									19,891,709	3,199,866	7,576,288

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