Leases - Weighted average lease term and discount rate (Details)	Jun. 30, 2024	Dec. 31, 2023
Leases
Weighted average remaining lease term in years - Operating leases	2 years 9 months 25 days	3 years 3 months 25 days
Weighted average remaining lease term in years - Finance leases	9 months	1 year 3 months
Weighted average discount rate - Operating leases	5.50%	5.50%
Weighted average discount rate - Finance leases	6.40%	6.40%