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v3.21.1

Organization and Reorganization - Additional information (Details) $ / shares in Units, ¥ in Thousands, $ in Thousands |  | 12 Months Ended | 13 Months Ended |
--- | --- | --- | --- | ---
Nov. 20, 2018 USD ($) $ / shares shares | Nov. 20, 2018 CNY (¥) shares | Dec. 31, 2020 USD ($) shares | Dec. 31, 2020 CNY (¥) shares | Dec. 31, 2019 CNY (¥) shares | Dec. 31, 2018 CNY (¥) | Aug. 31, 2020 shares | Dec. 31, 2020 CNY (¥)
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |
Offering 2,600,000 American Depositary Shares ("ADSs") issued and sold |  |  |  |  |  |  | 80,000 |
Proceeds of initial public offering, net of issuance costs | ¥ |  |  |  |  |  | ¥ 103,372 |  |
Variable interest entity registered capital | ¥ |  |  |  |  | ¥ 10,000 |  |  | ¥ 40,100
Net loss | ¥ |  |  |  | ¥ (163,500) | (251,300) | (78,700) |  |
Net cash used in operating activities |  |  | $ (13,618) | ¥ (88,854) | (161,806) | ¥ (53,338) |  |
Accumulated deficit |  |  | $ 135,126 |  | ¥ 718,666 |  |  | ¥ 881,700
Class A ordinary shares |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |
Number of initial public offering | 2,600,000 | 2,600,000 |  |  |  |  |  |
Offering 2,600,000 American Depositary Shares ("ADSs") issued and sold | 10,400,000 | 10,400,000 |  |  |  |  |  |
Share price per ADS | $ / shares | $ 7.80 |  |  |  |  |  |  |
Proceeds of initial public offering, net of issuance costs | $ 15,000 | ¥ 103,400 |  |  |  |  |  |
Best Cars Limited ("Best Cars") | Class A ordinary shares |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |
Number of ordinary shares held |  |  | 38,723,321 | 38,723,321 | 38,723,321 |  |  |

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