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SUPPLEMENTAL FINANCIAL INFORMATION | 6 Months Ended
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Jun. 30, 2017
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 June 30, |  | Six months ended June 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
Interest income | $ | 32 |  |  | $ | 20 |  |  | $ | 61 |  |  | $ | 40 |
Change in value of investments accounted at fair value | 119 |  |  | (69 | ) |  | 618 |  |  | — |
Change in value of warrant liabilities | 3,038 |  |  | 448 |  |  | 845 |  |  | 701 |
Change in value of convertible debentures | 147 |  |  | (428 | ) |  | (775 | ) |  | (989 | )
Sale of surplus assets | 345 |  |  | — |  |  | 1,138 |  |  | — |
Other | (1 | ) |  | 500 |  |  | (124 | ) |  | 481 |
Other income (expense) | $ | 3,680 |  |  | $ | 471 |  |  | $ | 1,763 |  |  | $ | 233 |

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