Options and RSUs granted during the year (Detail) - Employee Stock	12 Months Ended
	Dec. 31, 2023 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (Shares)	4,100
Option Grant Contingent upon Continued Employment or Service as a Director and Achievement of Performance Metric
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of options vesting rights	50.00%
Option Grant Solely Contingent upon Continued Employment or Continued Service as a Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of options vesting rights	25.00%