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LOANS AND BORROWINGS - Narrative (Details) $ / shares in Units, shares in Thousands, $ in Thousands			3 Months Ended			6 Months Ended
	Aug. 04, 2016 $ / shares	Jul. 24, 2012 CAD ($) shares	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2018 CAD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)	Aug. 03, 2016 $ / shares
Debt Instrument [Line Items]
Convertible debentures			$ 17,060			$ 17,060		$ 15,880
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%
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			(943)	$ (465)		$ 493	$ (320)
Unsecured Debt
Debt Instrument [Line Items]
Change in value of convertible debentures			$ (943)	470		$ (493)	$ 320
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

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