Taxation - Tax holiday effect (Details) - $ / shares	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021
Taxation
Basic and diluted benefit per share effect	$ 0.00	$ 0.00

Per share amount effect of the income tax benefit resulting from the income tax holidays granted by taxing jurisdictions.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 11.C)
-URI https://asc.fasb.org/extlink&oid=122134291&loc=d3e330215-122817

Name:	us-gaap_IncomeTaxHolidayIncomeTaxBenefitsPerShare
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration