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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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- Definition

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount recognized for uncertainty in income taxes classified as noncurrent.

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