Retirement plans - Additional Information (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
|
| Retirement plans | ||||
| Percentage of employee contribution of eligible compensation plan | 50.00% | |||
| Employer match percentage | 50.00% | |||
| Percent of employee contributions eligible for employer match | 6.00% | |||
| Employer match expense | $ 801 | $ 922 | $ 1,747 | $ 1,976 |