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SUBSEQUENT EVENTS - (Details)			1 Months Ended	9 Months Ended
	Oct. 27, 2021 USD ($) shares	Oct. 27, 2021 CAD ($) shares	Oct. 28, 2021 USD ($) $ / shares shares	Sep. 30, 2021 USD ($) shares	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($) shares
Subsequent Event [Line Items]
Asset Retirement Obligation Held For Sale, Current				$ 242,000		$ 0
Common stock, shares, issued (in shares) | shares				154,494,078		134,311,033
Proceeds from issuance of shares				$ 92,122,000	$ 44,642,000
Subsequent Event
Subsequent Event [Line Items]
Proceeds from asset purchase agreement	$ 2,000,000
Asset purchase agreement, shares received (in shares) | shares	11,860,101	11,860,101
Asset purchase agreement, shares received, percent outstanding	19.90%	19.90%
Asset purchase agreement, payments per project		$ 5,000,000
Subsequent Event | Payment to be received on 18-month anniversary
Subsequent Event [Line Items]
Asset purchase agreement, payment to be received		3,000,000
Subsequent Event | Payment to be received on 36-month anniversary
Subsequent Event [Line Items]
Asset purchase agreement, payment to be received		$ 3,000,000
Subsequent Event | At the Market Program
Subsequent Event [Line Items]
Common stock, shares, issued (in shares) | shares			1,070,000.00
Price per share (in USD per share) | $ / shares			$ 8.44
Proceeds from issuance of shares			$ 8,850,000

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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