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Research and License Agreements - Additional Information (Detail) | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jan. 31, 2017 USD ($) LicenseAgreement | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2013 USD ($)
University Research Agreement |  |  |  |  |  |
Research And Development Arrangement Contract To Perform For Others [Line Items] |  |  |  |  |  |
Research agreement date |  |  |  | 2013-12 |  |
Maximum allowable research and development expenses per year |  |  |  |  |  | $ 386,000
Research agreement expiration date |  |  |  | Aug. 31, 2018 |  |
Maximum allowable research and development expenses |  | $ 2,500,000 |  | $ 2,500,000 |  |
Payments pursuant to research agreements |  | $ 0 | $ 0 | $ 188,000 | $ 375,000 |
License Agreements |  |  |  |  |  |
Research And Development Arrangement Contract To Perform For Others [Line Items] |  |  |  |  |  |
Research agreement date |  |  |  | 2013-12 |  |
Number of license agreements | LicenseAgreement | 2 |  |  |  |  |
Maximum future contingent license payment | $ 6,400,000 |  |  |  |  |
Aggregate potential milestone payments for receipt of regulatory approval | 5,000,000 |  |  |  |  |
Aggregate potential milestone payments for final regulatory approval of second indication | $ 500,000 |  |  |  |  |
License Agreements | Minimum [Member] |  |  |  |  |  |
Research And Development Arrangement Contract To Perform For Others [Line Items] |  |  |  |  |  |
Rate of revenue share | 6.50% |  |  |  |  |
License Agreements | Maximum |  |  |  |  |  |
Research And Development Arrangement Contract To Perform For Others [Line Items] |  |  |  |  |  |
Rate of revenue share | 25.00% |  |  |  |  |

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- Definition Maximum allowable research and development expenses per year. + References No definition available. + Details
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