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LOANS AND BORROWINGS - Narrative (Details) $ / shares in Units, shares in Thousands, $ in Thousands				3 Months Ended			9 Months Ended
	Aug. 04, 2016 $ / shares	Dec. 03, 2013	Jul. 24, 2012 CAD ($) shares	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2017 CAD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2017 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
Price of aggregate principal amount redeemed	101.00%
Debentures held by the debentureholders	20.00%
Principal amount purchased plus accrued and unpaid interest	100.00%
Stated interest rate		5.75%
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				$ (1,455)	$ 160		$ (1,135)	$ (615)
Debt outstanding				17,251			17,251		$ 24,077
Minimum
Debt Instrument [Line Items]
Stated interest rate			8.50%
Obligation to repay debenture			40 days
Maximum
Debt Instrument [Line Items]
Stated 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
Debt Instrument, principal amount redeemed					$ 870	$ 1,130,000
Wyoming Industrial Development Revenue Bond Program Loan | Loans Payable
Debt Instrument [Line Items]
Term of debt		7 years
Amortization period		6 years
Debt outstanding				$ 8,300			$ 8,300

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