Specific incremental costs directly attributable to a proposed or actual offering of securities which are deferred at the end of the reporting period.

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Summary of significant accounting policies - Additional Information (Details) $ in Thousands		9 Months Ended
	Oct. 14, 2021	Sep. 30, 2021 USD ($) Customer	Sep. 30, 2020 Customer
Financing Receivable Impaired [Line Items]
Number of customer accounted for accounts receivable or revenue \| Customer		0	0
Deferred offering costs \| $		$ 2,505
Subsequent Event
Financing Receivable Impaired [Line Items]
Reverse stock split	1-for-6.046
Reverse stock split ratio	0.165