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Leases - Summary of Detailed Information About Amounts Recognized In Profit of Loss (Detail) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020 CNY (¥)		Dec. 31, 2020 USD ($)		Dec. 31, 2019 CNY (¥)
Disclosure Of Detailed Information About Lease Cost [Line Items]
Depreciation charge for right-of-use assets	¥ 43,127	[1]	$ 6,664	[1]	¥ 40,958
Interest expenses on lease liabilities	2,198		340		2,918
Expenses relating to short-term leases (included in selling, general and administrative costs and research and development cost)	14,313		2,212		14,341
Total amount recognized in profit or loss	¥ 59,638		$ 9,216		¥ 58,217
[1] In 2020, COVID-19 related rent rebate received from lessors of RMB 0.2 million (less than US$ 0.1 million) has been offset against the depreciation of right-of-use assets.

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- Definition

Disclosure of detailed information about lease cost .

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No definition available.

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- Definition

Lease Expense.

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X

- Definition

The amount of depreciation of right-of-use assets. [Refer: Depreciation and amortisation expense; Right-of-use assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2020-01-01
-Paragraph 53
-Subparagraph a
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- Definition

The amount of the expense relating to short-term leases accounted for applying paragraph 6 of IFRS 16. This expense need not include the expense relating to leases with a lease term of one month or less. Short-term lease is a lease that, at the commencement date, has a lease term of 12 months or less. A lease that contains a purchase option is not a short-term lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2020-01-01
-Paragraph 53
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- Definition

The amount of interest expense on lease liabilities. [Refer: Lease liabilities]

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Number 16
-IssueDate 2020-01-01
-Paragraph 53
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