v3.24.0.1
Commitments and contingencies - Components of operating lease expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Operating lease expense:      
Total operating lease cost $ 522 $ 440 $ 341
Other information:      
Cash paid for amounts included in the measurement of operating lease liability $ 321 $ 312 $ 303
Weighted average remaining lease term (years) 3 years 7 months 6 days 4 years 7 months 6 days 5 years 7 months 6 days
Weighted average discount rate 7.60% 7.60% 7.60%
General and administrative expense      
Operating lease expense:      
Operating lease cost $ 324 $ 324 $ 324
Short-term lease cost 161 58  
Variable operating lease cost $ 37 $ 58 $ 17