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Income Taxes - Net Operating Losses and Income Tax Concessions (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Income taxes |  |
Net operating loss carryforward, Total | $ 56.7 | $ 45.9
2023-2042 |  |
Income taxes |  |
Net operating Loss carryforward, US | 12.2 |
Indefinite |  |
Income taxes |  |
Net operating Loss carryforward, US | 4.3 |
Net operating Loss carryforward, Foreign | 35.4 |
2023-2042 |  |
Income taxes |  |
Net operating Loss carryforward, Foreign | $ 4.7 |

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