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Income taxes - Narrative (Details) $ in Millions	Dec. 31, 2018 USD ($)
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

X

- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible foreign operating loss carryforwards.

+ References

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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