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Income taxes - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Taxes [Line Items] |  |  |  |
Effective income tax rate, percent | (1.50%) | (4.23%) | (2.00%) |
Valuation allowance | $ 97,010 | $ 69,766 |  |
Valuation allowance increase | 27,200 |  |  |
Research and development tax credits | 13,301 | 0 |  |
Net operating loss carryforward, amount limited by Section 382 | 3,300 |  |  |
Unrecognized tax benefits | 3,608 | 10,580 | $ 146 | $ 146
Potential tax associated with foreign earnings being repatriated | 200 |  |  |
Deferred tax liability, CARES Act |  | $ 2,600 |  |
Payment of deferred taxes, CARES Act | 1,500 |  |  |
Domestic Tax Authority |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net operating loss carryforward | 189,200 |  |  |
Net operating loss carryforward subject to expiration | 101,900 |  |  |
Net operating loss carryforward not subject to expiration | 87,300 |  |  |
Research and development tax credits | 9,700 |  |  |
Domestic Tax Authority | Tax Year 2010-2012 |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net operating loss carryforward subject to expiration | 3,600 |  |  |
Domestic Tax Authority | CorpU |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net operating loss carryforward subject to expiration | 3,300 |  |  |
State and Local Jurisdiction |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net operating loss carryforward | 34,000 |  |  |
Research and development tax credits | $ 8,600 |  |  |

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