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SUPPLEMENTAL FINANCIAL INFORMATION | 12 Months Ended
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Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Supplemental Financial Information | SUPPLEMENTAL FINANCIAL INFORMATION The components of revenues are as follows: The Company had one major customer to which its sales for the year were as follows: 2020 - $1.55 million; (2019 (four major customers) - $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). The Company’s revenues by country of customer for the current year were as follows: 2020 - $1.66 million - U.S.; (2019 - $5.80 million - U.S.; $0.07 million - Other) (2018 - $25.76 million - U.S.; $5.03 million - Other). The Company did not have any deferred revenue at December 31, 2020 and 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,
| 2020 |  | 2019 |  | 2018
Interest income | $ | 153 |  |  | $ | 482 |  |  | $ | 336 |
Change in value of investments accounted for at fair value | 1,835 |  |  | (153) |  |  | 769 |
Change in value of warrant liabilities | (5,436) |  |  | 3,726 |  |  | (3,469) |
Change in value of Convertible Debentures | 155 |  |  | 291 |  |  | (612) |
Gain on assets held for sale | — |  |  | — |  |  | 341 |
Foreign exchange gain (loss) | 767 |  |  | (46) |  |  | — |
Sale of surplus assets | — |  |  | — |  |  | 293 |
Other | 233 |  |  | (322) |  |  | 14 |
Other income (loss) | $ | (2,293) |  |  | $ | 3,978 |  |  | $ | (2,328) |
The components of accounts payable and accrued liabilities are as follows:
| December 31, 2020 |  | December 31, 2019
Accounts payable | $ | 483 |  |  | $ | 2,033 |
Payroll liabilities | 432 |  |  | 1,588 |
Other accrued liabilities | 2,406 |  |  | 1,817 |
Accounts payable and accrued liabilities | $ | 3,321 |  |  | $ | 5,438 |

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