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SUPPLEMENTAL FINANCIAL INFORMATION | 12 Months Ended
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Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Supplemental Financial Information | SUPPLEMENTAL FINANCIAL INFORMATION The components of revenues are as follows: The Company has three major customers to which its sales for the year were as follows: 2017 - $13.08 million; $6.99 million; $4.40 million; (2016 (three major customers) - $33.36 million; $8.69 million; $7.00 million); (2015 (four major customers) - $20.98 million; $16.31 million; $12.53 million; $9.00 million). The Company’s revenues by country of customer for the current year were as follows: 2017 - $20.07 million - U.S.; Other - $4.40 million; (2016 - $50.76 million - U.S.; Other - $3.69 million) (2015 -$37.85 million - U.S.; $20.98 million - South Korea; Other - $1.87 million). Deferred revenue at December 31, 2017 of $2.47 million (2016 - $2.34 million) relates to proceeds received on delivery of alternate feed materials in advance of the required processing activity. The components of other income (expense) are as follows:
| Years ended December 31,
| 2017 |  | 2016 |  | 2015
Interest income | $ | 161 |  |  | $ | 143 |  |  | $ | 94 |
Change in value of investments accounted at fair value | 509 |  |  | — |  |  | 38 |
Change in value of warrant liabilities | 784 |  |  | 420 |  |  | 590 |
Change in value of convertible debentures | (940 | ) |  | (407 | ) |  | (1,548 | )
Gain on settlement of loans and borrowings | — |  |  | 424 |  |  | — |
Insurance settlement | — |  |  | 223 |  |  | — |
Sales and property tax refunds | — |  |  | 176 |  |  | — |
Gain on sale of mineral properties | — |  |  | 316 |  |  | — |
Sale of surplus assets | 1,913 |  |  | — |  |  | — |
Other | 142 |  |  | (96 | ) |  | 406 |
Other income (expense) | $ | 2,569 |  |  | $ | 1,199 |  |  | $ | (420 | )
The components of accounts payable and accrued liabilities are as follows:
| December 31, 2017 |  | December 31, 2016
Accounts payable | $ | 762 |  |  | $ | 1,150 |
Payroll liabilities | 835 |  |  | 1,374 |
Other accrued liabilities | 4,852 |  |  | 3,232 |
Accounts payable and accrued liabilities | $ | 6,449 |  |  | $ | 5,756 |

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