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Long-term loans receivable - Additional Information (Detail) € in Thousands, ¥ in Thousands, $ in Thousands	1 Months Ended		12 Months Ended
	Mar. 31, 2020 CNY (¥)	Jan. 31, 2020	Dec. 31, 2022 CNY (¥)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 CNY (¥)	Dec. 31, 2020 CNY (¥)	Dec. 31, 2022 USD ($)	Jan. 01, 2020 CNY (¥)	Jan. 01, 2020 EUR (€)
Loans from third parties, amount repaid			¥ 40,000
Loans and Leases Receivable, Gross			4,000				$ 580
Third Party [Member]
Debt instrumen outstanding amount			12,000				1,740
Third Party [Member] | Not Later Than Nine Months [Member]
Debt instrumen outstanding amount			2,000				290
Third Party [Member] | Not Later Than One Year [Member]
Debt instrumen outstanding amount			2,000				290
Third Party [Member] | Later Than One Year And Not Later Than Two Years [Member]
Debt instrumen outstanding amount			8,000				$ 1,160
Key AAV [Member]
Long term loans receivable. Agreement term	2 years	3 years
Loans receivable principal amount	¥ 1,900							¥ 52,000	€ 243
Loans receivable, interest rate	3.50%							3.00%	3.00%
Loans receivable, interest income			¥ 423	$ 61	¥ 418	¥ 984

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- Definition

Loans Receivable With Fixed Rates Of Interest Percentage

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No definition available.

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- Definition

Long Term Loans Receivable Agreement Term

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- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
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-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
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- Definition

The gross interest income that would have been recorded in the period on troubled debt restructurings, if the loans had been current in accordance with their original terms and had been outstanding throughout the period or since origination, if held for part of the period.

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- Definition

Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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-Section 45
-Paragraph 15
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