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Nature of Business and Basis of Presentation - Additional Information (Detail) $ in Thousands |  |  | 3 Months Ended |
--- | --- | --- | --- | ---
Aug. 01, 2017 | Jan. 05, 2017 shares | Mar. 31, 2018 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2017 USD ($)
Nature Of Business And Basis Of Presentation [Line Items] |  |  |  |  |
Accumulated deficit |  |  | $ (15,716) |  | $ (12,694)
Net loss |  |  | (3,022) | $ (205) |
Cash and cash equivalents at carrying value |  |  | 4,165 |  | $ 5,284
Working capital |  |  | $ 2,200 |  |
OncoGenex Pharmaceuticals, Inc [Member] |  |  |  |  |
Nature Of Business And Basis Of Presentation [Line Items] |  |  |  |  |
Conversion of each issued share of Achieve common stock , shares converted | shares |  | 8,210,118 |  |  |
Reverse stock split ratio | 0.0909 | 0.0909 |  |  |

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