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Common Stock - Additional Information (Detail) |  |  | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Apr. 09, 2019 | Aug. 08, 2018 shares | Mar. 31, 2021 $ / shares shares | Sep. 30, 2020 shares | Apr. 09, 2020 $ / shares
Class of Warrant or Right [Line Items] |  |  |  |  |
Warrants term |  |  | 5 years |  |
Warrants of common stock exercise price | $ / shares |  |  | $ 0.004 |  | $ 3.98
Maximum percentage of stock pertaining to restrictions |  |  | 24.90% |  |
Extended term of outstanding warrants expiration period |  |  | 5 years |  |
Warrants of common stock expiration date |  |  | Sep. 30, 2023 |  |
Common stock, warrants issued |  |  | 4,899,497 | 0 |
Common stock, warrants outstanding |  |  | 4,899,497 | 0 |
2018 Equity Incentive Plan [Member] |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |
Common stock, stock split |  |  | 2.5-for-1 stock split effected |  |
Stock split ratio | 2.5 |  |  |  |
Increase in number of shares authorized for issuance |  | 1,000,000 |  |  |

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