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Convertible notes payable to a related party (Details) - Convertible Debt
$ / shares in Units, ¥ in Thousands, $ in Thousands
May 13, 2022
CNY (¥)
investor
shares
May 13, 2022
USD ($)
$ / shares
Related Party    
Related party balances and transactions    
Debt instrument term 12 months  
Aggregate principal amount ¥ 67,871 $ 10,000
Number of investors | investor 1  
Interest rate 5.00%  
Threshold amount of guarantee obligations considered for determination of an event of default | $   $ 100,000
Period following the issuance date of convertible notes payable, to consummate initial public offering of Class A ordinary shares 6 months  
Conversion price (in USD per share)   $ 9.50
Conversion-Lotus convertible notes payable (in shares) | shares 1,052,632  
Related Party | Debt Conversion Scenario One    
Related party balances and transactions    
Conversion price (in USD per share)   $ 10.00
Related Party | Minimum    
Related party balances and transactions    
Written notice period by company for redemption of convertible notes payable 20 days  
Related Party | Maximum    
Related party balances and transactions    
Written notice period by company for redemption of convertible notes payable 35 days  
Investor | Debt Conversion Scenario Two    
Related party balances and transactions    
Conversion price as a percentage of Initial Conversion Price 95.00% 95.00%
Investor | Debt Conversion Scenario Three    
Related party balances and transactions    
Written notice period by note holder for redemption of convertible notes payable 10 days