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Income taxes - Narrative (Details) $ in Millions | Dec. 31, 2018 USD ($)
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Domestic Tax Authority |
Tax Credit Carryforward [Line Items] |
Domestic operating loss carryforwards | $ 37.8
Foreign Tax Authority |
Tax Credit Carryforward [Line Items] |
Foreign operating loss carryforwards | 14.0
Foreign Tax Authority | Research Tax Credit Carryforward |
Tax Credit Carryforward [Line Items] |
Foreign research and development tax credit carryforwards | $ 2.6

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