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SUPPLEMENTAL FINANCIAL INFORMATION | 3 Months Ended
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Mar. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Supplemental Financial Information | SUPPLEMENTAL FINANCIAL INFORMATION The components of other (loss) income are as follows:
| Three months ended March 31,
| 2019 |  | 2018
Interest income | $ | 111 |  |  | $ | 50 |
Change in value of investments accounted for at fair value | 375 |  |  | (224 | )
Change in value of warrant liabilities | (732 | ) |  | 364 |
Change in value of convertible debentures | (1,436 | ) |  | (145 | )
Sale of surplus assets | — |  |  | 14 |
Other | (1 | ) |  | 4 |
Other (loss) income | $ | (1,683 | ) |  | $ | 63 |

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