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LOANS AND BORROWINGS - Narrative (Details) $ / shares in Units, shares in Thousands, $ in Thousands					12 Months Ended
	Oct. 06, 2020 CAD ($)	Jul. 14, 2020 CAD ($)	Aug. 04, 2016 $ / shares	Jul. 24, 2012 CAD ($) shares	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Oct. 06, 2020 USD ($)	Aug. 03, 2016 $ / shares
Debt Instrument [Line Items]
Public offering of floating-rate convertible unsecured subordinated debentures (in shares) | shares				22
Price per debenture issuance				$ 1,000
Proceeds from issuance of debt				$ 21,550,000
Conversion price per share | $ / shares			$ 4.15						$ 15.00
Debentures held by the debentureholders			20.00%
Price Of Aggregate Principal Amount Redeemed, Percent			101.00%
Principal amount purchased plus accrued and unpaid interest			100.00%
Consecutive trading days				20 days	20 days
Average trading price is not less than percent of the conversion price				125.00%
Debt (in CAD)				$ 1,000
Volume-weighted average trading price of the common shares				95.00%
Change in value of Convertible Debentures					$ 155	$ 291	$ (612)
Convertible Debt
Debt Instrument [Line Items]
Nominal Interest Rate					8.50%
Minimum
Debt Instrument [Line Items]
Nominal Interest Rate				8.50%
Obligation to repay debenture				40 days
Maximum
Debt Instrument [Line Items]
Nominal Interest Rate				13.50%
Obligation to repay debenture				60 days
Convertible Debentures | Convertible Debt
Debt Instrument [Line Items]
Number of days notice to redeem debentures			30 days
Repayments of Convertible Debt	$ 10,430,000	$ 10,430,000
Principal amount purchased plus accrued and unpaid interest		101.00%						101.00%
Convertible Subordinated Debt		$ 20,860,000						$ 7,820

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