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Ordinary shares - Additional Information (Details) $ / shares in Units, ¥ in Thousands, $ in Millions |  | 12 Months Ended | 13 Months Ended
--- | --- | --- | ---
Nov. 20, 2018 USD ($) $ / shares shares | Nov. 20, 2018 CNY (¥) shares | Dec. 31, 2020 | Dec. 31, 2018 CNY (¥) | Aug. 31, 2020 shares
Number of shares issued |  |  |  |  | 80,000
Proceeds from issuance of IPO,net of issuance cost | ¥ |  |  |  | ¥ 103,372 |
ADS |  |  |  |  |
Number of shares issued |  |  |  |  | 20,000
Number of initial public offering | 2,600,000 | 2,600,000 |  |  |
Class A ordinary shares |  |  |  |  |
Number of shares issued | 10,400,000 | 10,400,000 |  |  |
Proceeds from issuance of IPO,net of issuance cost | $ 15.0 | ¥ 103,400 |  |  |
Number of initial public offering | 2,600,000 | 2,600,000 |  |  |
Issuance Price per Share (US$) | $ / shares | $ 7.80 |  |  |  |
Pre-IPO China Best Redeemable and Series A to Series C |  |  |  |  |
Conversion ratio to class A ordinary shares |  |  | 1 |  |
Series D1 and Series D2 Shares |  |  |  |  |
Conversion ratio to class A ordinary shares |  |  | 1.47 |  |

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