Leases - Weighted average lease term and discount rate (Details)	Dec. 31, 2023	Dec. 31, 2022
Leases
Weighted average remaining lease term in years - Operating leases	3 years 3 months 25 days	4 years 1 month 20 days
Weighted average remaining lease term in years - Finance leases	1 year 3 months	2 years 3 months
Weighted average discount rate - Operating leases	5.50%	5.50%
Weighted average discount rate - Finance leases	6.40%	6.40%