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Term loan (Details) - USD ($) $ in Thousands	1 Months Ended
Term loan (Details) - USD ($) $ in Thousands	Nov. 30, 2020	Sep. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Carrying value of term loan		$ 4,821	$ 4,635
Secured Debt \| Term Loan Facility
Debt Instrument [Line Items]
Debt instrument, face amount	$ 30,000
Funded advances	5,000
Principal outstanding		$ 5,000
Secured Debt \| Term B Loan
Debt Instrument [Line Items]
Debt instrument, face amount	10,000
Secured Debt \| Term C Loan
Debt Instrument [Line Items]
Debt instrument, face amount	$ 15,000