Available-for-sale debt securities - Summary of Interest Income on Available-for-sale Debt Securities (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-Sale [Abstract]
Interest income	$ 8,452	$ 5,771	$ 482,684

Amount of interest income, amortization of premium and accretion of discount on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale); classified as operating.

No definition available.

Name:	us-gaap_InterestIncomeDebtSecuritiesAvailableForSaleOperating
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration