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SUPPLEMENTAL FINANCIAL INFORMATION - Schedule of Other Nonoperating Income (Expense) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
Interest income $ 336 $ 161 $ 143
Change in value of investments accounted at fair value 769 509 0
Change in value of warrant liabilities (3,469) 784 420
Change in value of convertible debentures (612) (940) (407)
Gain on settlement of loans and borrowings 0 0 424
Insurance settlement 0 0 223
Sales and property tax refunds 0 0 176
Gain on sale of mineral properties 0 0 316
Gain on sale of mineral properties 341 0 0
Gain (Loss) on Disposition of Property Plant Equipment 293 1,913 0
Other 14 142 (96)
Other income (expense) $ (2,328) $ 2,569 $ 1,199