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Common Stock - Additional Information (Detail) - $ / shares | 9 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Jun. 28, 2018
Class of Warrant or Right [Line Items] |  |
Warrants term | 5 years |
Warrants of common stock exercise price | $ 0.004 |
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 |
Warrants to purchase shares of common stock |  | 250,000

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