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Share-based Compensation - 2019 Incentive Plan (Details) ¥ / shares in Units, $ / shares in Units, ¥ in Thousands | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2019 $ / shares shares | Sep. 30, 2019 CNY (¥) shares | Dec. 31, 2024 CNY (¥) $ / shares shares | Dec. 31, 2024 CNY (¥) ¥ / shares shares | Dec. 31, 2023 USD ($) $ / shares | Dec. 31, 2023 CNY (¥) ¥ / shares shares | Dec. 31, 2022 USD ($) $ / shares | Dec. 31, 2022 CNY (¥) ¥ / shares shares | Dec. 31, 2021 USD ($) $ / shares shares | Dec. 31, 2024 USD ($) shares | Jun. 30, 2021 shares
2019 incentive plan |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares authorized under the plan (in shares) | 137,186,000 | 137,186,000 |  |  |  |  |  |  |  |  |
Incremental compensation cost | ¥ |  | ¥ 0 |  |  |  |  |  |  |  |  |
Assumptions |  |  |  |  |  |  |  |  |  |  |
Expected volatility |  |  |  | 53.87% |  | 53.06% |  | 51.97% |  |  |
Contractual term (in year) |  |  |  | 10 years |  | 10 years |  | 10 years |  |  |
Risk-free interest rate |  |  |  | 4.22% |  | 3.77% |  | 3.57% |  |  |
Number of shares |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 89,155,596 |  | 94,028,978 |  | 94,830,430 |  |  |
Granted during the year |  |  |  | 84,256 |  | 875,004 |  | 3,167,881 |  |  |
Exercised during the year |  |  |  | (10,243,525) |  | (674,082) |  | (2,107,600) |  |  |
Forfeited / Cancelled during the year |  |  |  | (3,221,189) |  | (5,074,304) |  | (1,861,733) |  |  |
Ending balance |  |  |  | 75,775,138 |  | 89,155,596 |  | 94,028,978 | 94,830,430 |  |
Exercisable at the end |  |  | 71,244,501 | 71,244,501 |  |  |  |  |  | 71,244,501 |
Weighted average exercise price US$/Share |  |  |  |  |  |  |  |  |  |  |
Outstanding at beginning of period | $ / shares |  |  | $ 0.0001 |  | $ 0.0001 |  | $ 0.0001 |  |  |  |
Granted during the year | $ / shares |  |  | 0.0001 |  | 0.0001 |  | 0.0001 |  |  |  |
Exercised during the year | $ / shares |  |  | 0.0001 |  | 0.0001 |  | 0.0001 |  |  |  |
Forfeited during the year | $ / shares |  |  | 0.0001 |  | 0.0001 |  | 0.0001 |  |  |  |
Outstanding at end of period | $ / shares | $ 0.0001 |  | $ 0.0001 |  | $ 0.0001 |  | $ 0.0001 |  | $ 0.0001 |  |
Aggregate intrinsic value |  |  |  |  |  |  |  |  |  |  |
Aggregate intrinsic value US$ | $ |  |  |  |  | $ 1,997,085 |  | $ 3,881,516 |  | $ 4,324,268 | $ 477,368 |
Weighted average remaining contractual years |  |  |  |  |  |  |  |  |  |  |
Weighted average remaining contractual years |  |  |  | 5 years 7 months 13 days |  | 6 years 7 months 13 days |  | 7 years 6 months 10 days | 8 years 5 months 8 days |  |
Unrecognized share-based compensation expenses, recognition period |  |  |  | 6 months 29 days |  |  |  |  |  |  |
Weighted average grant date fair value of share options | ¥ / shares |  |  |  | ¥ 0.11 |  | ¥ 0.27 |  | ¥ 0.26 |  |  |
Share based compensation expense | ¥ |  |  |  | ¥ 180 |  | ¥ 4,670 |  | ¥ 13,880 |  |  |
Unrecognized share-based compensation expenses | ¥ |  |  | $ 340 | ¥ 340 |  |  |  |  |  |  |
2019 incentive plan | Class A Ordinary Shares |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares authorized under the plan (in shares) |  |  | 18,740,479 | 18,740,479 |  |  |  |  |  | 18,740,479 |
2014 and 2016 incentive plan |  |  |  |  |  |  |  |  |  |  |
Number of shares |  |  |  |  |  |  |  |  |  |  |
Forfeited / Cancelled during the year |  | (91,548,120) |  |  |  |  |  |  |  |  |
Updated incentive plan 2019 |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares authorized under the plan (in shares) |  |  |  |  |  |  |  |  |  |  | 162,186,000
Employee Stock Option |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Vesting period (in years) |  |  |  | 4 years |  |  |  |  |  |  |
Expiration period (in years) |  |  |  | 10 years |  |  |  |  |  |  |
Replacement share options | 2019 incentive plan |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of replaced share options |  |  |  | 0 |  | 0 |  | 0 |  |  |
Certain directors and senior management | 2019 incentive plan |  |  |  |  |  |  |  |  |  |  |
Number of shares |  |  |  |  |  |  |  |  |  |  |
Granted during the year |  |  |  | 84,256 |  | 875,004 |  | 3,167,881 |  |  |

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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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