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Related Parties - Additional Information (Detail) - ATR [Member] ¥ in Thousands, $ in Thousands	3 Months Ended				9 Months Ended
	Sep. 30, 2025 USD ($)	Sep. 30, 2025 CNY (¥)	Sep. 30, 2024 USD ($)	Sep. 30, 2024 CNY (¥)	Sep. 30, 2025 USD ($)	Sep. 30, 2025 CNY (¥)	Sep. 30, 2024 USD ($)	Sep. 30, 2024 CNY (¥)
Related Party Transaction [Line Items]
Effective interest rate					4.35%	4.35%
Interest paid							$ 2	¥ 17
Land lease commenced year					2007	2007
Land lease expiry year					2054	2054
Rent paid	$ 31	¥ 223	$ 31	¥ 223	$ 94	¥ 669	94	¥ 669
Minority Shareholder Loan [Member]
Related Party Transaction [Line Items]
Borrowings	$ 0		$ 0		$ 0		$ 0
Akers AB [Member]
Related Party Transaction [Line Items]
Ownership interest percentage	59.88%				59.88%
Minimum [Member]
Related Party Transaction [Line Items]
Interest accrual period					3 years	3 years
Maximum [Member]
Related Party Transaction [Line Items]
Interest accrual period					5 years	5 years

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