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Nature of Business and Basis of Presentation - Additional Information (Detail) $ in Thousands |  |  | 3 Months Ended | 8 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Aug. 01, 2017 | Jan. 05, 2015 shares | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Nature Of Business And Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated deficit |  |  | $ (12,694) |  |  |  | $ (2,062) |  |  |  |  | $ (12,694) | $ (2,062) |
Net loss |  |  | (3,740) | $ (6,469) | $ (169) | $ (205) | (486) | $ (268) | $ (238) | $ (242) | $ (828) | (10,583) | (1,234) | $ (828)
Cash and cash equivalents at carrying value |  |  | 5,284 |  |  |  | $ 15 |  |  |  |  | 5,284 | $ 15 |
Working capital |  |  | $ 3,700 |  |  |  |  |  |  |  |  | $ 3,700 |  |
OncoGenex Pharmaceuticals, Inc [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nature Of Business And Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reverse stock split ratio | 0.0909 | 0.0909 |  |  |  |  |  |  |  |  |  |  |  |
Conversion of each issued share of Achieve common stock , shares converted | shares |  | 8,210,118 |  |  |  |  |  |  |  |  |  |  |  |

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