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Summary of Significant Accounting Policies - Additional Information (Detail) - Pre-funded Warrants - shares | Sep. 30, 2022 | Apr. 22, 2022 | Sep. 30, 2021
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December 2020 Public Offering |  |  |
Subsidiary Sale Of Stock [Line Items] |  |  |
Number of outstanding warrants issued to purchase common stock (in shares) | 3,200,000 |  | 3,200,000
April 2022 Public Offering |  |  |
Subsidiary Sale Of Stock [Line Items] |  |  |
Number of outstanding warrants issued to purchase common stock (in shares) | 11,666,667 | 11,666,667 |

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- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21475-112644 + Details
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