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LOANS AND BORROWINGS - Narrative (Details) $ / shares in Units, shares in Thousands, $ in Thousands |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Aug. 04, 2016 $ / shares | Dec. 03, 2013 | Jul. 24, 2012 CAD ($) shares | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2018 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% |  |  |  |  |  |  |
Nominal 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 |  |  |  | $ 612 | $ 940 | $ 407 |  |
Long-term Debt |  |  |  | $ 15,880 | $ 24,077 |  |  |
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 |  |  |  |  |  |  |
Nominal interest rate |  |  |  | 8.50% |  |  |  |
Wyoming Industrial Development Revenue Bond Program Loan | Loans Payable |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Term of debt |  | 7 years |  |  |  |  |  |
Amortization period |  | 6 years |  |  |  |  |  |
Long-term Debt |  |  |  |  |  |  | $ 8,300 |

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