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Income taxes - Narrative (Details) - USD ($) $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Jan. 01, 2020 | Jan. 01, 2019 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2018
Income taxes |  |  |  |  |  |
Income tax expense |  |  | $ 0.0 | $ 0.0 | $ 0.0 |
Valuation allowance increase due to increase in the deferred tax assets |  |  | $ 1.5 | $ 8.6 |  |
Corporate income tax rate |  |  | 21.00% | 21.00% | 21.00% |
Uncertain tax positions |  |  | $ 0.1 | $ 0.1 | $ 0.8 |
Costs deemed direct or incidental to research and development capitalized |  |  | 8.6 |  |  |
Foreign |  |  |  |  |  |
Income taxes |  |  |  |  |  |
Operating loss carryforwards |  |  | 117.2 |  |  |
Federal |  |  |  |  |  |
Income taxes |  |  |  |  |  |
Operating loss carryforwards |  |  | 53.8 |  |  |
State |  |  |  |  |  |
Income taxes |  |  |  |  |  |
Operating loss carryforwards |  |  | $ 53.5 |  |  |
Sweden. |  |  |  |  |  |
Income taxes |  |  |  |  |  |
Corporate income tax rate | 20.60% | 21.40% |  |  |  | 22.00%

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