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Income Taxes - Net Operating Losses and Income Tax Concessions (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Income taxes |  |
Net operating loss carryforward, Total | $ 57.4 | $ 40.1
2021-2040 |  |
Income taxes |  |
Net operating Loss carryforward, US | 8.2 |
Indefinite |  |
Income taxes |  |
Net operating Loss carryforward, US | 2.8 |
Net operating Loss carryforward, Foreign | 41.5 |
2022-2040 |  |
Income taxes |  |
Net operating Loss carryforward, Foreign | $ 4.9 |

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