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SUPPLEMENTAL FINANCIAL INFORMATION | 3 Months Ended
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Mar. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Supplemental Financial Information | SUPPLEMENTAL FINANCIAL INFORMATION The components of other income (expense) are as follows:
| Three months ended March 31,
| 2018 |  | 2017
Interest income | $ | 50 |  |  | $ | 29 |
Change in value of investments accounted at fair value | (224 | ) |  | 499 |
Change in value of warrant liabilities | 364 |  |  | (2,193 | )
Change in value of convertible debentures | (145 | ) |  | (922 | )
Sale of surplus assets | 14 |  |  | 793 |
Other | 4 |  |  | (123 | )
Other income | $ | 63 |  |  | $ | (1,917 | )

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