Summary of significant accounting policies - Strategic investments (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Schedule of Investments [Line Items]
Purchase of investments		$ 750	$ 3,100	$ 0
Investment at cost		$ 2,000	$ 2,000
Convertible Notes Payable | SwiftConnect
Schedule of Investments [Line Items]
Purchase of investments	$ 2,000