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License Agreements - Additional Information (Detail) |  | 1 Months Ended | 15 Months Ended | 105 Months Ended
--- | --- | --- | --- | ---
May 14, 2015 | Jul. 31, 2016 USD ($) | Sep. 30, 2017 USD ($) g | Sep. 30, 2017 USD ($)
Sopharma [Member] |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |
Payments under license agreement |  |  |  | $ 10
License agreement expiry date | May 26, 2029 |  |  |
University of Bristol [Member] |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |
Payments under license agreement |  |  | $ 50,000 |
Maximum amount payable under license agreement, tied to milestones |  | $ 3,200,000 |  |
License agreement expiry |  | 2036-07 |  |
Volume of cytisine provided as an initial contribution | g |  |  | 100 |
University of Bristol [Member] | Minimum [Member] | License Agreement [Member] |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |
Patent expiry date |  | Feb. 05, 2036 |  |

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