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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, 2022
$ / shares
Dec. 31, 2022
CNY (¥)
class
Vote
¥ / shares
shares
Dec. 31, 2021
CNY (¥)
¥ / shares
shares
Dec. 31, 2020
CNY (¥)
¥ / shares
shares
Computation of Earnings Per Share [Line Items]        
Net (income) loss attributable to Class A and Class B ordinary shareholders | ¥   ¥ 976,571 ¥ 1,314,131 ¥ (745,225)
Weighted average number of Class A and Class B ordinary shares outstanding-basic   34,166,016 33,585,818 31,020,439
Plus: effect of dilutive stock options   25,354 171,355  
Plus: effect of dilutive non-vested restricted shares   6,701 24,600  
Weighted average number of Class A and Class B ordinary shares outstanding-diluted   34,198,071 33,781,773 31,020,439
Basic net income (loss) per share | (per share) $ 4.14 ¥ 28.58 ¥ 39.12 ¥ (24.02)
Diluted net income (loss) per share | (per share) $ 4.14 ¥ 28.56 ¥ 38.90 ¥ (24.02)
Common stock        
Number of classes of common stock | class   2    
Class A ordinary shares        
Common stock        
Number of votes per share | Vote   1    
Class B ordinary shares        
Common stock        
Number of votes per share | Vote   4