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Disclosure - Additional Information-Parent Company Only Condensed Financial Information - Condensed balance sheets (Details) link:presentationLink link:calculationLink link:definitionLink 99942502 - Disclosure - Additional Information-Parent Company Only Condensed Financial Information - Condensed statements of operations and comprehensive loss (Details) link:presentationLink link:calculationLink link:definitionLink 99942503 - Disclosure - Additional Information-Parent Company Only Condensed Financial Information - Condensed statements of cash flows (Details) link:presentationLink link:calculationLink link:definitionLink 995210101 - Disclosure - Operations and Principal Activities link:presentationLink link:calculationLink link:definitionLink 995210201 - Disclosure - Significant Accounting Policies link:presentationLink link:calculationLink link:definitionLink 995210301 - Disclosure - Concentrations and Risks link:presentationLink link:calculationLink link:definitionLink 995210401 - Disclosure - 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