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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 |  |

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