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Net Income (Loss) per Share - Basic and diluted net income per share (Details)
¥ / shares in Units, ¥ in Thousands
 12 Months Ended
Dec. 31, 2021
$ / shares
Dec. 31, 2021
CNY (¥)
Vote
class
¥ / shares
shares
Dec. 31, 2020
CNY (¥)
¥ / shares
shares
Dec. 31, 2019
CNY (¥)
¥ / shares
shares
Computation of Earnings Per Share [Line Items]        
Net income (loss) attributable to Class A and Class B ordinary shareholders-basic | ¥   ¥ 1,314,131 ¥ (745,225) ¥ 829,151
Plus: interest expense for convertible notes | ¥       679
Net income (loss) attributable to Class A and Class B ordinary shareholders-diluted | ¥   ¥ 1,314,131 ¥ (745,225) ¥ 829,830
Weighted average number of Class A and Class B ordinary shares outstanding-basic   33,585,818 31,020,439 30,580,181
Plus: share options and non-vested restricted shares   195,955   281,191
Plus: shares outstanding for convertible notes       62,723
Weighted average number of Class A and Class B ordinary shares outstanding-diluted   33,781,773 31,020,439 30,924,095
Basic net income (loss) per share | (per share) $ 6.14 ¥ 39.12 ¥ (24.02) ¥ 27.12
Diluted net income (loss) per share | (per share) $ 6.10 ¥ 38.90 ¥ (24.02) ¥ 26.84
Common stock        
Number of classes of common stock | class   2    
Class A        
Common stock        
Number of votes per share | Vote   1    
Class B        
Common stock        
Number of votes per share | Vote   4