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Income taxes - Narrative (Details) - USD ($) |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 01, 2020 | Jan. 01, 2019 | Jun. 30, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income taxes |  |  |  |  |  |
Income tax expense |  |  |  | $ 0 | $ 0 | $ 0
Valuation allowance increase due to increase in the deferred tax assets |  |  |  | 13,900,000 | 7,000,000 |
Uncertain tax positions |  |  |  | $ 800,000 | $ 0 |
Corporate income tax rate |  |  |  | 21.00% | 21.00% | 21.00%
Increase (decrease) in deferred income taxes |  |  | $ (700,000) |  |  |
Foreign |  |  |  |  |  |
Income taxes |  |  |  |  |  |
Operating loss carryforwards |  |  |  | $ 118,000,000 |  |
Domestic |  |  |  |  |  |
Income taxes |  |  |  |  |  |
Operating loss carryforwards |  |  |  | 28,900,000 |  |
State |  |  |  |  |  |
Income taxes |  |  |  |  |  |
Operating loss carryforwards |  |  |  | $ 28,600,000 |  |
Sweden |  |  |  |  |  |
Income taxes |  |  |  |  |  |
Corporate income tax rate | 20.60% | 21.40% |  |  |  | 22.00%

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