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SUPPLEMENTAL FINANCIAL INFORMATION - Schedule of Other Nonoperating Income (Expense) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
Interest income $ 161 $ 143 $ 94
Change in value of investments accounted at fair value 509 0 38
Change in value of warrant liabilities 784 420 590
Change in value of convertible debentures (940) (407) (1,548)
Gain on settlement of loans and borrowings 0 424 0
Insurance settlement 0 223 0
Sales and property tax refunds 0 176 0
Gain on sale of mineral properties 0 316 0
Gain (Loss) on Disposition of Property Plant Equipment 1,913 0 0
Other 142 (96) 406
Other income (expense) $ 2,569 $ 1,199 $ (420)