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Income Taxes - Net Operating Loss Carryforwards (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | $ 284,626 | $ 202,181
Expiring 2020 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses |  | 2,197
Expiring 2021 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 352 | 355
Expiring 2022 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 544 |
Expiring 2023 - and After |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 283,730 |
Expiring 2022 - and After |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses |  | 199,629
CANADA |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 269,001 | 178,339
CANADA | Expiring 2020 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses |  | 0
CANADA | Expiring 2021 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 0 | 0
CANADA | Expiring 2022 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 0 |
CANADA | Expiring 2023 - and After |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 269,001 |
CANADA | Expiring 2022 - and After |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses |  | 178,339
UNITED STATES |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 12,592 | 13,582
UNITED STATES | Expiring 2020 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses |  | 79
UNITED STATES | Expiring 2021 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 317 | 318
UNITED STATES | Expiring 2022 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 529 |
UNITED STATES | Expiring 2023 - and After |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 11,746 |
UNITED STATES | Expiring 2022 - and After |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses |  | 13,185
PERU |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 340 | 3,916
PERU | Expiring 2020 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses |  | 2,110
PERU | Expiring 2021 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 26 | 28
PERU | Expiring 2022 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 0 |
PERU | Expiring 2023 - and After |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 314 |
PERU | Expiring 2022 - and After |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses |  | 1,778
MEXICO |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 2,406 | 2,792
MEXICO | Expiring 2020 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses |  | 0
MEXICO | Expiring 2021 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 0 | 0
MEXICO | Expiring 2022 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 0 |
MEXICO | Expiring 2023 - and After |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 2,406 |
MEXICO | Expiring 2022 - and After |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses |  | 2,792
BARBADOS |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 203 | 120
BARBADOS | Expiring 2020 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses |  | 7
BARBADOS | Expiring 2021 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 8 | 7
BARBADOS | Expiring 2022 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 12 |
BARBADOS | Expiring 2023 - and After |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 183 |
BARBADOS | Expiring 2022 - and After |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses |  | 106
ARGENTINA |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 84 | 3,432
ARGENTINA | Expiring 2020 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses |  | 1
ARGENTINA | Expiring 2021 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 1 | 2
ARGENTINA | Expiring 2022 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 3 |
ARGENTINA | Expiring 2023 - and After |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | $ 80 |
ARGENTINA | Expiring 2022 - and After |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses |  | $ 3,429

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