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SUPPLEMENTAL FINANCIAL INFORMATION | 12 Months Ended
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Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Supplemental Financial Information | SUPPLEMENTAL FINANCIAL INFORMATION The components of revenues are as follows: The Company had four major customers to which its sales for the year were as follows: 2019 - $2.72 million; $0.77 million; $0.75 million, $0.74 million; (2018 (three major customers) - $24.52 million; $5.03 million; $1.24 million); (2017 (three major customers) - $13.08 million; $6.99 million; $4.40 million). The Company’s revenues by country of customer for the current year were as follows: 2019 - $5.80 million - U.S.; $0.07 million - Other; (2018 - $25.76 million - U.S.; $5.03 million - Other) (2017 - $20.07 million - U.S.; $4.40 million - Other). The Company did not have any deferred revenue at December 31, 2019. As of December 31, 2018, $2.72 million relates to proceeds received on toll materials in advance of required activity. The components of other income (loss) are as follows:
| Years ended December 31,
| 2019 |  | 2018 |  | 2017
Interest income | $ | 482 |  |  | $ | 336 |  |  | $ | 161 |
Change in value of investments accounted for at fair value | (153 | ) |  | 769 |  |  | 509 |
Change in value of warrant liabilities | 3,726 |  |  | (3,469 | ) |  | 784 |
Change in value of Convertible Debentures | 291 |  |  | (612 | ) |  | (940 | )
Gain on assets held for sale | — |  |  | 341 |  |  | — |
Foreign exchange loss | (46 | ) |  | — |  |  | — |
Sale of surplus assets | — |  |  | 293 |  |  | 1,913 |
Other | (322 | ) |  | 14 |  |  | 142 |
Other income (loss) | $ | 3,978 |  |  | $ | (2,328 | ) |  | $ | 2,569 |
The components of accounts payable and accrued liabilities are as follows:
| December 31, 2019 |  | December 31, 2018
Accounts payable | $ | 2,033 |  |  | $ | 1,881 |
Payroll liabilities | 1,588 |  |  | 1,928 |
Other accrued liabilities | 1,817 |  |  | 4,112 |
Accounts payable and accrued liabilities | $ | 5,438 |  |  | $ | 7,921 |

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