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Mezzanine equity - Rights, preferences and privileges of preferred shares (Details)
 12 Months Ended
Dec. 31, 2023
day
Temporary Equity Disclosure [Abstract]  
Number of days within which a material breach is to be cured 30
Number of days within which a material illegal act is to be cured 30
Competent directors vote 67.00%
Number of days after the resignation of Mr. Ziyu Shen, to appoint a successor 30
Redemption price percentage 100.00%
Interest rate percentage 8.00%
Conversion ratio 1
Preferred Preference Amount, percentage 100
Ordinary Preference Amount, percentage 100