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Nature of Business, Basis of Presentation and Going Concern Uncertainty - Additional Information (Detail) |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
May 23, 2018 | Aug. 01, 2017 shares | Dec. 31, 2019 USD ($) Product | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2019 USD ($) Product | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Nature Of Business And Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Reverse stock split ratio | 0.1 |  |  |  |  |  |  |  |  |  |  |  |
Number of products approved for commercial sale | Product |  |  | 0 |  |  |  |  |  |  |  | 0 |  |
Revenue from product sales |  |  |  |  |  |  |  |  |  |  | $ 0 |  |
Type of Revenue [Extensible List] |  |  |  |  |  |  |  |  |  |  | us-gaap:ProductMember |  |
Net loss |  |  | $ (3,194,000) | $ (3,673,000) | $ (3,624,000) | $ (5,904,000) | $ (3,637,000) | $ (3,240,000) | $ (2,788,000) | $ (3,022,000) | $ (16,395,000) | $ (12,687,000) | $ (10,583,000)
Accumulated deficit |  |  | (45,704,000) |  |  |  | $ (25,381,000) |  |  |  | (45,704,000) | (25,381,000) |
Cash, cash equivalents and short term investments |  |  | 16,700,000 |  |  |  |  |  |  |  | 16,700,000 |  |
Working capital |  |  | $ 14,500,000 |  |  |  |  |  |  |  | 14,500,000 |  |
Net cash used in operations |  |  |  |  |  |  |  |  |  |  | $ 15,216,000 | $ 10,623,000 | $ 9,107,000
OncoGenex Pharmaceuticals, Inc [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Nature Of Business And Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Reverse stock split ratio |  | 0.0909 |  |  |  |  |  |  |  |  |  |  |
Conversion of each issued share of Achieve common stock , shares converted | shares |  | 821,011 |  |  |  |  |  |  |  |  |  |  |

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