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Revenue from contracts with customers - Performance Obligations (Detail) ¥ in Thousands, $ in Thousands	Dec. 31, 2020 CNY (¥)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 CNY (¥)
Disclosure of transaction price allocated to remaining performance obligations [line items]
Total unfulfilled service-type maintenance service	¥ 179,723	$ 27,773	¥ 181,139
Within one year [member]
Disclosure of transaction price allocated to remaining performance obligations [line items]
Total unfulfilled service-type maintenance service	112,454	17,377	127,326
More than one year [member]
Disclosure of transaction price allocated to remaining performance obligations [line items]
Total unfulfilled service-type maintenance service	¥ 67,269	$ 10,396	¥ 53,813

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- Definition

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

+ References

No definition available.

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- Definition

The amount of the transaction price allocated to the performance obligations that are unsatisfied (or partially unsatisfied) as of the end of the reporting period. The transaction price is the amount of consideration to which an entity expects to be entitled in exchange for transferring promised goods or services to a customer, excluding amounts collected on behalf of third parties (for example, some sales taxes). [Refer: Performance obligations [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2020-01-01
-Paragraph 120
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2020-en-r&anchor=para_120_a&doctype=Standard
-URIDate 2020-01-01

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