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Commitments and Contingencies - Future Minimum Rentals Payable Under Non-cancellable Operating Leases (Detail) ¥ in Thousands, $ in Thousands	Dec. 31, 2024 CNY (¥)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 CNY (¥)
Disclosure of finance lease and operating lease by lessee [line items]
Future minimum rentals payable under non-cancellable operating leases	¥ 0	$ 0	¥ 296
One year or less [member]
Disclosure of finance lease and operating lease by lessee [line items]
Future minimum rentals payable under non-cancellable operating leases	0	0	98
Later than one year and not later than five years [member]
Disclosure of finance lease and operating lease by lessee [line items]
Future minimum rentals payable under non-cancellable operating leases	0	0	198
Later than five years [member]
Disclosure of finance lease and operating lease by lessee [line items]
Future minimum rentals payable under non-cancellable operating leases	¥ 0	$ 0	¥ 0