Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 850
-SubTopic 10
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 850
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 850
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-Publisher FASB
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
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Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
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-Name Accounting Standards Codification
-Section S99
-Paragraph 1
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1

+ Details

Related Parties - Additional Information (Detail) - ATR [Member] ¥ in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2026 USD ($)	Jun. 30, 2026 CNY (¥)	Jun. 30, 2025 USD ($)	Jun. 30, 2025 CNY (¥)	Jun. 30, 2026 USD ($)	Jun. 30, 2026 CNY (¥)	Jun. 30, 2025 USD ($)	Jun. 30, 2025 CNY (¥)
Related Party Transaction [Line Items]
Land lease commenced year					2007	2007
Land lease expiry year					2054	2054
Rent paid	$ 31	¥ 223	$ 31	¥ 223	$ 61	¥ 446	$ 61	¥ 446
Akers AB [Member]
Related Party Transaction [Line Items]
Ownership interest percentage	59.88%	59.88%			59.88%	59.88%