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Summary of significant accounting policies - Currency exchange rates (Details) - $ / ¥	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021
Foreign Currency Translation
Currency exchange rate (US$:RMB)	0.1493	0.1569	0.1549
Currency exchange rate (US$:RMB) - Average	0.1543	0.1550	0.1546

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- Definition

Average foreign exchange rate used to translate amounts denominated in functional currency to reporting currency.

+ References

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- Definition

Foreign exchange rate used to translate amounts denominated in functional currency to reporting currency.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
-SubTopic 30
-Section S99
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=6897108&loc=SL6897125-166521

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
-SubTopic 30
-Section 50
-Paragraph 2
-URI https://asc.fasb.org/extlink&oid=6450520&loc=d3e32618-110901

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