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Defined contribution plan
12 Months Ended
Dec. 31, 2023
Defined Contribution Plan [Abstract]  
Defined Contribution Plan Defined contribution plan

The Company’s full-time employees are eligible to participate in a 401(k) plan that is administered by a related party of Kaiser. The Company makes a safe harbor matching contribution equal to 100% of the employee’s salary deferrals that do not exceed 3% of compensation plus 50% of the employee’s salary deferrals between 3% and 5% of compensation. The safe harbor matching contribution is 100% vested. The Company has no further payment obligations once the contributions have been paid. The contributions are recognized as employee benefit expense when they are due. The Company recorded $1.0 million, $0.8 million and $0.7 million in compensation expense related to the plan during the years ended December 31, 2023, 2022 and 2021, respectively.