Employee benefit plan (Details) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2023
USD ($)
hour
|
Dec. 31, 2022
USD ($)
|
Dec. 31, 2021
USD ($)
|
|
| Retirement Benefits [Abstract] | |||
| Eligible age to participate | 21 years | ||
| Minimum number of hours for eligibility | hour | 1,000 | ||
| Maximum contribution by employee (as a percent) | 95.00% | ||
| Percentage employer matches of the employee's percentage contribution matched | 100.00% | 100.00% | 100.00% |
| Employer matching contribution (as a percent) | 4.00% | 4.00% | 4.00% |
| Employee benefit expenses | $ | $ 1.3 | $ 1.1 | $ 0.8 |