Income taxes - Reconciliation of Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance as of beginning of period	$ 23,493	$ 21,956
Increases (decreases) for tax positions related to current period	944	1,582
Increases (decreases) for tax positions related to prior periods		(45)
Increases (decreases) for tax positions related to prior periods	101
Balance as of end of period	$ 24,538	$ 23,493