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Summary of significant accounting policies - Currency exchange rates (Details) - $ / ¥ | Jun. 30, 2022 | Dec. 31, 2021 | Jun. 30, 2021
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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 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 + Details
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