v3.26.1
Share-based compensation - Stock option activity (Details)
 12 Months Ended
Apr. 30, 2019
¥ / shares
shares
Oct. 31, 2018
¥ / shares
shares
May 09, 2018
$ / shares
shares
May 09, 2018
¥ / shares
shares
Apr. 30, 2018
¥ / shares
shares
Oct. 11, 2017
¥ / shares
shares
May 03, 2016
¥ / shares
shares
Jun. 29, 2015
¥ / shares
shares
Jan. 25, 2015
¥ / shares
shares
Dec. 31, 2025
CNY (¥)
¥ / shares
shares
Dec. 31, 2024
CNY (¥)
¥ / shares
shares
Number of Options                      
Outstanding at beginning of the year (in shares) | shares                   4,003,514  
Granted (in shares) | shares 155,000 475,000 40,000,000 40,000,000 841,054 16,616,000 7,425,000 630,000 13,843,645    
Exercised (in shares) | shares                   1,879,130  
Outstanding at end of the year (in shares) | shares                   2,124,384 4,003,514
Vested and expected to vest, Number of Options (in shares) | shares                   2,124,384  
Exercisable, Number of Options (in shares) | shares                   2,124,384  
Exercise Price                      
Granted (in dollars per share) | $ / shares     $ 4.75                
Outstanding at end of the year (in dollars per share) ¥ 31.96 ¥ 27.93   ¥ 30.27 ¥ 25.42     ¥ 0.27 ¥ 0.27    
Remaining Contractual                      
Granted (in years)                   0 years  
Exercised (in years)                   0 years  
Forfeited/Cancelled (in years)                   0 years  
Exercisable, Remaining Contractual (in years)                   3 years 4 months 17 days  
Intrinsic value of options                      
Outstanding at beginning of the year | ¥                   ¥ 5,954,422  
Outstanding at end of the year | ¥                   870,002 ¥ 5,954,422
Vested and expected to vest, Intrinsic value of options | ¥                   870,002  
Exercisable, Intrinsic value of options | ¥                   ¥ 870,002  
Minimum                      
Exercise Price                      
Outstanding at beginning of the year (in dollars per share)                   ¥ 0.27  
Exercised (in dollars per share)                   0.27  
Outstanding at end of the year (in dollars per share)           ¥ 0.27 ¥ 0.27     0.27 ¥ 0.27
Vested and expected to vest, Exercise Price (in dollars per share)                   0.27  
Exercisable, Exercise Price (in dollars per share)                   ¥ 0.27  
Remaining Contractual                      
Outstanding remaining contractual term(in years)                   4 months 2 days 21 days
Vested and expected to vest, Remaining Contractual (in years)                   4 months 2 days  
Exercisable, Remaining Contractual (in years)                   4 months 2 days  
Maximum                      
Exercise Price                      
Outstanding at beginning of the year (in dollars per share)                   ¥ 31.96  
Exercised (in dollars per share)                   10.71  
Outstanding at end of the year (in dollars per share)           ¥ 27.02 ¥ 10.71     31.96 ¥ 31.96
Vested and expected to vest, Exercise Price (in dollars per share)                   31.96  
Exercisable, Exercise Price (in dollars per share)                   ¥ 31.96  
Remaining Contractual                      
Outstanding remaining contractual term(in years)                   3 years 4 months 17 days 4 years 3 months 25 days
Vested and expected to vest, Remaining Contractual (in years)                   3 years 4 months 17 days