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Common Stock - Additional Information (Detail) - $ / shares | 9 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2021 | Sep. 30, 2020 | Apr. 09, 2020
Stockholders Equity Note [Abstract] |  |  |
Warrants term | 5 years |  |
Warrants of common stock exercise price | $ 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 |

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