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Nature of Business and Basis of Presentation - Additional Information (Detail) $ in Thousands |  |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | ---
May 23, 2018 | Aug. 01, 2017 | Jan. 05, 2017 | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Nature Of Business And Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |
Reverse stock split ratio | 0.1 |  |  |  |  |  |  |
Accumulated deficit |  |  |  | $ (21,744) |  | $ (21,744) |  | $ (12,694)
Net loss |  |  |  | (3,240) | $ (6,472) | (9,050) | $ (6,843) |
Cash, cash equivalents and short term investments |  |  |  | 13,200 |  | 13,200 |  |
Working capital |  |  |  | $ 10,600 |  | $ 10,600 |  |
OncoGenex Pharmaceuticals, Inc [Member] |  |  |  |  |  |  |  |
Nature Of Business And Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |
Reverse stock split ratio |  | 0.0909 | 0.0909 |  |  |  |  |

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