Summary of significant accounting policies - Narrative (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2023 USD ($)	Sep. 30, 2023 USD ($) segment	Dec. 31, 2022 USD ($)	Sep. 30, 2022 USD ($)
Summary of significant accounting policies
Number of operating segments | segment		1
Restricted cash	$ 100	$ 100	$ 100	$ 100
Deferred offering costs	300
Capitalized costs associated with PIPE transaction	100
Deferred offering costs	$ 100	$ 100	$ 300
Expected dividend yield		0.00%