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Convertible Redeemable Preferred Shares - Conversion right, Dividend right, Liquidation preference, Redemption rights (Details)
12 Months Ended
Dec. 31, 2021
CNY (¥)
factor
shares
Dec. 31, 2020
CNY (¥)
Dec. 31, 2019
CNY (¥)
Convertible Redeemable Preferred Shares      
Dividend declared | ¥ ¥ 0 ¥ 0 ¥ 0
Liquidation amount as percentage of temporary equity issue price 100.00%    
Payment term of redemption right (in days) 90 days    
Ordinary shares      
Convertible Redeemable Preferred Shares      
Conversion ratio of preferred shares to ordinary shares | shares 1    
Series A-1 A-2 B-1 B-2 B-3 B-4 C-1 D Convertible Redeemable Preferred Stock [Member]      
Convertible Redeemable Preferred Shares      
Factor in calculating dividend 8    
Series D And C-1 Redeemable Preferred Shares [Member]      
Convertible Redeemable Preferred Shares      
Factor included in liquidation calculation 12    
Factor included in calculation of redemption price 10    
Merger      
Convertible Redeemable Preferred Shares      
Percentage of voting 50.00%    
Preferred shares | Series B-1, B-2, B-3, and B-4 convertible redeemable preferred shares      
Convertible Redeemable Preferred Shares      
Redemption price as a percentage on issue price 120.00%    
Preferred shares | Series A-2 Convertible Redeemable Preferred Stock      
Convertible Redeemable Preferred Shares      
Redemption price as a percentage on issue price 300.00%