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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2016
Income Taxes [Abstract] |
Schedule of income/(loss) before income tax, domestic and foreign |
|  | Years ended December 31, |
|  | 2016 |  | 2015 |  | 2014 |
U.S. |  | $ | 1,219 |  | $ | (3,297) |  | $ | (6,705) |
Canada |  |  | (1,395) |  |  | (121) |  |  | (7,750) |
Other Foreign |  |  | (2,957) |  |  | 4,429 |  |  | (4,471) |
|  | $ | (3,133) |  | $ | 1,011 |  | $ | (18,926) |
Schedule of effective income tax rate reconciliation |
|  | Years ended December 31, |
|  | 2016 |  | 2015 |  | 2014 |
Income taxed at statutory rates |  | $ | (1,226) |  | $ | 392 |  | $ | (7,314) |
Increase (decrease) in taxes from: |  |  |  |  |  |  |  |  |  |
Stock-based compensation |  |  | (382) |  |  | 32 |  |  | 41 |
Other adjustments |  |  | 15 |  |  | 27 |  |  | 5 |
Adjustment due to capital transactions |  |  |  |  |  | (119) |  |  | — |
R&D grant |  |  | 5,936 |  |  | 5,366 |  |  | — |
Prior year provision to actual adjustments |  |  | (4,269) |  |  | (2,894) |  |  | (4,511) |
Differences in tax rates |  |  | 524 |  |  | (368) |  |  | 541 |
Effect of foreign exchange |  |  | 379 |  |  | 350 |  |  | 276 |
Expiration of NOLs |  |  | - |  |  | 231 |  |  | 189 |
Change in valuation allowance |  |  | (977) |  |  | (3,017) |  |  | 10,773 |
Income tax (benefit)/expense |  | $ | — |  | $ | — |  | $ | — |
Schedule of deferred tax assets and liabilities |
|  | December 31, |
|  | 2016 |  | 2015 |  | 2014 |
Deferred income tax assets |  |  |  |  |  |  |  |  |  |
Excess tax basis over book basis of property, plant and equipment |  | $ | 7,773 |  | $ | 7,785 |  | $ | 7,893 |
Marketable securities |  |  | 713 |  |  | 862 |  |  | 798 |
Operating loss carryforwards |  |  | 27,943 |  |  | 26,464 |  |  | 35,001 |
Capital loss carryforwards |  |  | 13,469 |  |  | 13,463 |  |  | 10,212 |
Other |  |  | 1,783 |  |  | 2,725 |  |  | 2,891 |
Total future tax assets |  |  | 51,681 |  |  | 51,299 |  |  | 56,795 |
Valuation allowance for future tax assets |  |  | (50,209) |  |  | (50,816) |  |  | (54,397) |
|  |  | 1,472 |  |  | 483 |  |  | 2,398 |
Deferred income tax liabilities |  |  |  |  |  |  |  |  |  |
Other investments |  |  | 1,472 |  |  | 483 |  |  | 1,916 |
Amayapampa disposal consideration |  |  | — |  |  | — |  |  | 482 |
|  |  | 1,472 |  |  | 483 |  |  | 2,398 |
Total Deferred Taxes |  | $ | — |  | $ | — |  | $ | — |
Summary of expiring loss carryforwards |
|  | Noncapital Canada (1) |  | U.S. |  | Mexico |  | Barbados |  | Total |
2016 |  | $ | — |  | $ | — |  | $ | — |  | $ | (2) |  | $ | (2) |
2017 |  |  | — |  |  | — |  |  | — |  |  | (1) |  |  | (1) |
2018 |  |  | — |  |  | — |  |  | — |  |  | (6) |  |  | (6) |
2019 |  |  | — |  |  | — |  |  | — |  |  | (20) |  |  | (20) |
2020 |  |  | — |  |  | — |  |  | — |  |  | (42) |  |  | (42) |
2021 |  |  | — |  |  | — |  |  | — |  |  | (20) |  |  | (20) |
2022 |  |  | — |  |  | — |  |  | (5,511) |  |  | (31) |  |  | (5,542) |
2023 |  |  | — |  |  | — |  |  | (302) |  |  | (23) |  |  | (325) |
2024 |  |  | — |  |  | — |  |  | — |  |  | (4) |  |  | (4) |
2025 |  |  | — |  |  | — |  |  | — |  |  | (6) |  |  | (6) |
2026 |  |  | (1,027) |  |  | — |  |  | — |  |  | — |  |  | (1,027) |
2027 |  |  | (847) |  |  | (1,287) |  |  | — |  |  | — |  |  | (2,134) |
2028 |  |  | (5,245) |  |  | (1,719) |  |  | — |  |  | — |  |  | (6,964) |
2029 |  |  | (4,022) |  |  | (1,970) |  |  | — |  |  | — |  |  | (5,992) |
2030 |  |  | (5,032) |  |  | (1,827) |  |  | — |  |  | — |  |  | (6,859) |
2031 |  |  | (3,806) |  |  | (3,407) |  |  | — |  |  | — |  |  | (7,213) |
2032 |  |  | (6,397) |  |  | (2,323) |  |  | — |  |  | — |  |  | (8,720) |
2033 |  |  | (6,076) |  |  | (3,098) |  |  | — |  |  | — |  |  | (9,174) |
2034 |  |  | (4,420) |  |  | (2,824) |  |  | — |  |  | — |  |  | (7,244) |
2035 |  |  | (3,729) |  |  | — |  |  |  |  |  |  |  |  | (3,729) |
2036 |  |  | (2,798) |  |  | — |  |  |  |  |  |  |  |  | (2,798) |
|  | $ | (43,399) |  | $ | (18,455) |  | $ | (5,813) |  | $ | (155) |  | $ | (67,822) |
| (1) |  | Canadian capital loss carryforwards of $55,367 and Australian NOLs of $25,909, which do not expire and are therefore not included above.

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