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Commitments and contingencies - Additional Information (Detail) - Dec. 31, 2021 ¥ in Thousands, $ in Thousands | CNY (¥) | USD ($)
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Commitments and Contingencies Disclosure [Abstract] |  |
Capital expenditure commitments | ¥ 46,391 | $ 7,280

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of commitment classified as other to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant