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v3.25.2

Related Parties - Additional Information (Detail) - ATR [Member] ¥ in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 USD ($) | Jun. 30, 2025 CNY (¥) | Jun. 30, 2024 USD ($) | Jun. 30, 2024 CNY (¥) | Jun. 30, 2025 USD ($) | Jun. 30, 2025 CNY (¥) | Jun. 30, 2024 USD ($) | Jun. 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 | $ 30 | ¥ 223 | $ 30 | ¥ 223 | $ 61 | ¥ 446 | 61 | ¥ 446
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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