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401(k) plan (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Retirement Benefits [Abstract]      
Matching contribution (as a percent of total salary) 100.00% 100.00% 100.00%
Percentage of employee's base salary, matched by employer 6.00% 6.00% 6.00%
Expense recorded $ 10.9 $ 8.4 $ 6.6