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SUPPLEMENTAL FINANCIAL INFORMATION | 9 Months Ended
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Sep. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Supplemental Financial Information | SUPPLEMENTAL FINANCIAL INFORMATION The components of other income are as follows:
| Three months ended September 30, |  | Nine months ended September 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
Interest income | $ | 57 |  |  | $ | 36 |  |  | $ | 118 |  |  | $ | 76 |
Change in value of investments accounted at fair value | (113 | ) |  | — |  |  | 505 |  |  | — |
Change in value of warrant liabilities | 571 |  |  | 1,178 |  |  | 1,416 |  |  | 1,879 |
Change in value of convertible debentures | 160 |  |  | 323 |  |  | (615 | ) |  | (666 | )
Sale of surplus assets | — |  |  | — |  |  | 1,138 |  |  | — |
Other | 14 |  |  | 333 |  |  | (110 | ) |  | 814 |
Other income | $ | 689 |  |  | $ | 1,870 |  |  | $ | 2,452 |  |  | $ | 2,103 |

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