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Income Taxes - Net Operating Loss Carryforwards (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | $ 239,216 | $ 131,179
Expiring 2017 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses |  | 134
Expiring 2018 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 2,197 | 148
Expiring 2019 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 355 |
Expiring 2020 - and After |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 236,664 |
Expiring 2019 - and After |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses |  | 130,897
CANADA |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 215,374 | 114,466
CANADA | Expiring 2017 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses |  | 0
CANADA | Expiring 2018 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 0 | 0
CANADA | Expiring 2019 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 0 |
CANADA | Expiring 2020 - and After |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 215,374 |
CANADA | Expiring 2019 - and After |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses |  | 114,466
UNITED STATES |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 13,582 | 13,634
UNITED STATES | Expiring 2017 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses |  | 85
UNITED STATES | Expiring 2018 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 79 | 80
UNITED STATES | Expiring 2019 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 318 |
UNITED STATES | Expiring 2020 - and After |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 13,185 |
UNITED STATES | Expiring 2019 - and After |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses |  | 13,469
PERU |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 3,916 | 250
PERU | Expiring 2017 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses |  | 0
PERU | Expiring 2018 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 2,110 | 0
PERU | Expiring 2019 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 28 |
PERU | Expiring 2020 - and After |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 1,778 |
PERU | Expiring 2019 - and After |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses |  | 250
MEXICO |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 2,792 | 2,456
MEXICO | Expiring 2017 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses |  | 0
MEXICO | Expiring 2018 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 0 | 0
MEXICO | Expiring 2019 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 0 |
MEXICO | Expiring 2020 - and After |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 2,792 |
MEXICO | Expiring 2019 - and After |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses |  | 2,456
BARBADOS |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 120 | 116
BARBADOS | Expiring 2017 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses |  | 4
BARBADOS | Expiring 2018 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 7 | 7
BARBADOS | Expiring 2019 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 7 |
BARBADOS | Expiring 2020 - and After |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 106 |
BARBADOS | Expiring 2019 - and After |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses |  | 105
ARGENTINA |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 3,432 | 257
ARGENTINA | Expiring 2017 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses |  | 45
ARGENTINA | Expiring 2018 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 1 | 61
ARGENTINA | Expiring 2019 |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | 2 |
ARGENTINA | Expiring 2020 - and After |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses | $ 3,429 |
ARGENTINA | Expiring 2019 - and After |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unused tax operating losses |  | $ 151

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