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Share-based compensation - Stock option valuation (Details) - ¥ / shares
Apr. 30, 2019
Oct. 31, 2018
May 09, 2018
Apr. 30, 2018
Oct. 11, 2017
May 03, 2016
Jun. 29, 2015
Jan. 25, 2015
Dec. 31, 2019
Dec. 31, 2018
Share-based compensation                    
Fair value of underlying ordinary shares (in dollars per share) ¥ 16.65 ¥ 26.74 ¥ 38.14 ¥ 41.33 ¥ 30.29 ¥ 16.98 ¥ 9.66 ¥ 4.91    
Exercise Price (in dollars per share) ¥ 31.96 ¥ 27.93 ¥ 30.27 ¥ 25.42     ¥ 0.27 ¥ 0.27    
Expected Volatility per annum (as a percent) 30.15% 43.90% 39.30% 45.47% 38.60% 42.00% 38.00% 43.00%    
Risk-Free Rate (as a percent) 2.97% 3.15% 2.94% 2.96% 2.35% 1.81% 2.33% 1.81%    
Exercise Multiple 0.0 2.5   2.5 2.5 2.5 2.5 2.5    
Dividend Yield ( as a percent )    
Time to Maturity (Years) 10 years 10 years 5 years 10 years 10 years 10 years 10 years 10 years    
Minimum                    
Share-based compensation                    
Exercise Price (in dollars per share)         ¥ 0.27 ¥ 0.27     ¥ 0.27 ¥ 0.27
Exercise Multiple     5.58              
Maximum                    
Share-based compensation                    
Exercise Price (in dollars per share)         ¥ 27.02 ¥ 10.71     ¥ 31.96 ¥ 30.27
Exercise Multiple     (38.33)