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Warrants - Additional Information (Detail) $ / shares in Units, ¥ in Thousands |  |  |  | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 06, 2018 CNY (¥) shares | Jul. 06, 2018 USD ($) shares | Sep. 25, 2017 shares | Sep. 22, 2017 shares | Sep. 30, 2020 CNY (¥) shares | Sep. 30, 2020 USD ($) shares | Sep. 30, 2019 CNY (¥) | Dec. 31, 2020 CNY (¥) | Sep. 30, 2020 $ / shares | Jun. 29, 2018 shares | Oct. 31, 2016 $ / shares
Fair value gain of warrants for the year | ¥ |  |  |  |  |  |  | ¥ (5,609) |  |  |  |
Issuance of Private Placement |  |  |  |  | ¥ 1,980,548 | $ 291,703,000 |  |  |  |  |
Share price | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 0.77
Investor Warrants [Member] |  |  |  |  |  |  |  |  |  |  |
Fair value of the Warrants | ¥ |  |  |  |  | ¥ 71,874,000 |  |  |  |  |  |
Collaboration Agreement With Investores [Member] |  |  |  |  |  |  |  |  |  |  |
Issuance of Private Placement | $ |  |  |  |  |  | 418,000,000 |  |  |  |  |
Hillhouse Entities [Member] |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of warrants | $ |  |  |  |  |  | 45.00 |  |  |  |  |
Series B Preferred Shareholders [Member] |  |  |  |  |  |  |  |  |  |  |
Number of share issued, ADS |  |  |  | 5,633,780 |  |  |  |  |  |  |
Series B Onshore Investors [Member] |  |  |  |  |  |  |  |  |  |  |
Number of share issued, ADS |  |  | 2,620,842 |  |  |  |  |  |  |  |
Tranche I Of Series B Warrants [Member] |  |  |  |  |  |  |  |  |  |  |
Value of outstanding securities | $ |  |  |  |  |  | $ 20,000,000 |  |  |  |  |
Warrants issued and exercised | 3,301,849 | 3,301,849 |  |  |  |  |  |  |  |  |
Series B2 Preferred Shares [Member] |  |  |  |  |  |  |  |  |  |  |
Number of share issued, ADS |  |  |  |  | 3,301,849 | 3,301,849 |  |  |  |  |
Value of outstanding securities | ¥ 132,332 | $ 20,000,000 |  |  |  |  |  |  |  |  |
Warrants issued and exercised |  |  |  |  |  |  |  |  |  | 3,301,849 |
Tranche II of Series B Warrants [Member] |  |  |  |  |  |  |  |  |  |  |
Value of outstanding securities | $ |  |  |  |  |  | $ 30,000,000 |  |  |  |  |
Series B Warrants Shares [Member] |  |  |  |  |  |  |  |  |  |  |
Warrants issued and exercised | 4,952,773 | 4,952,773 |  |  |  |  |  |  |  |  |
Fair value gain of warrants for the year | ¥ |  |  |  |  | ¥ 5,609 |  |  | ¥ 0 |  |  |
American Depositary Shares [Member] | Investor Warrants [Member] |  |  |  |  |  |  |  |  |  |  |
Number of share issued, ADS |  |  |  |  | 5,341,267 | 5,341,267 |  |  |  |  |
Share price | $ / shares |  |  |  |  |  |  |  |  | $ 45 |  |
Proceeds from issuance of warrants | $ |  |  |  |  |  | $ 104,500,000 |  |  |  |  |

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