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Summary of significant accounting policies - Debt Issuance Costs (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Summary of significant accounting policies
Debt issuance costs	$ 0		$ 0		$ 1,300,000
Amortization of the debt issuance costs	$ 100,000	$ 100,000	$ 400,000	$ 700,000

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Amount of amortization expense attributable to debt issuance costs.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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