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Restructuring and severance - Additional Information (Detail)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Feb. 28, 2023
USD ($)
employee
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
Restructuring and severance            
Number Of Employees | employee 50          
Percentage Of Reduction In Employees 28.00%          
Restructuring $ 1,000 $ 0 $ 0 $ 0 $ 991  
Accrual for contractual severance benefits           $ 200