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LOANS AND BORROWINGS - (Outstanding Loans) (Details) CAD in Thousands, $ in Thousands	Dec. 31, 2017 USD ($)	Dec. 31, 2017 CAD	Dec. 31, 2016 USD ($)	Dec. 31, 2016 CAD	Dec. 03, 2013
Debt Instrument [Line Items]
Nominal interest rate					5.75%
Face value	$ 27,491		$ 30,463
Carrying amount	$ 27,491		29,554
Convertible Debt | Convertible Debentures
Debt Instrument [Line Items]
Nominal interest rate	8.50%	8.50%
Face value | CAD		CAD 16,636		CAD 16,385
Carrying amount | CAD		CAD 16,636		CAD 15,476
Secured Debt | Wyoming Industrial Development Revenue Bond Program Loan
Debt Instrument [Line Items]
Nominal interest rate	5.75%	5.75%
Face value	$ 10,855		14,078
Carrying amount	$ 10,855		$ 14,078

X

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

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X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

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+ References

No definition available.

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- Definition

Represents the aggregate of total long-term debt, including current maturities and short-term debt.

+ References

No definition available.

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