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Income taxes - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
State net operating loss carryforwards	$ 600,000
Net operating loss carryforwards period	20 years
Unrecognized tax benefits that would impact effective tax rate	$ 400,000	$ 300,000
Unrecognized tax benefits expected to reverse in next twelve months	200,000
Accrued gross interest and penalties	100,000	100,000
Recognized net interest expense	$ (40,000)	$ 17,000	$ 100,000

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Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit.

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

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The amount of estimated interest recognized in the period arising from income tax examinations.

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