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Share-based Compensation - Share option replacement (Details) - CNY (¥) ¥ in Millions |  | 1 Months Ended | 12 Months Ended | 13 Months Ended
--- | --- | --- | --- | ---
Jun. 17, 2019 | Jun. 30, 2018 | Jun. 15, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Aug. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of shares issued |  |  |  |  |  |  | 80,000
Stock Repurchased From Employees During Period, Shares | 6,358,500 |  |  |  |  |  |
TuanChe Limited Share Incentive Plan (the "Plan") |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of restricted shares shall replaced with options |  |  | 15,473,653 |  |  |  |
Number of share options replaced with restricted shares |  |  | 13,740,480 |  |  |  |
Incremental value recognized as expenses for vested share options |  | ¥ 10.7 |  |  |  |  |
Incremental value recognized as expenses for unvested share options |  | ¥ 3.7 |  |  |  |  |
TuanChe Limited Share Incentive Plan (the "Plan") | Minimum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting period |  | 1 year |  |  |  |  |
TuanChe Limited Share Incentive Plan (the "Plan") | Employees | Minimum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting period |  |  |  | 0 years | 0 years |  |
TuanChe Limited Share Incentive Plan (the "Plan") | Employees | Maximum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting period |  |  |  | 4 years | 4 years |  |
TuanChe Limited Share Incentive Plan (the "Plan") | Best Cars Limited ("Best Cars") |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of shares issued |  | 38,723,321 |  |  |  |  |
Restricted shares |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Total share based compensation expense |  |  |  | ¥ 17.4 | ¥ 110.0 | ¥ 71.2 |
Weighted average period |  |  |  | 1 year 11 months 1 day |  |  |
Restricted shares | TuanChe Limited Share Incentive Plan (the "Plan") | Maximum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting period |  | 4 years |  |  |  |  |
Restricted shares | TuanChe Limited Share Incentive Plan (the "Plan") | Employees |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of restricted shares granted |  |  |  | 3,890,000 | 11,527,950 |  |
Total fair value of restricted shares granted |  |  |  | ¥ 27.5 | ¥ 112.6 |  |
Share options |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Total share based compensation expense |  |  |  |  |  | ¥ 0.6 |

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