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Reverse Merger - Additional Information (Detail) $ / shares in Units, $ in Thousands |  |  |  | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
May 23, 2018 | Aug. 01, 2017 Year Right $ / shares shares | Jan. 05, 2017 | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) shares | Sep. 30, 2018 shares
Business Acquisition [Line Items] |  |  |  |  |  |
Reverse stock split ratio | 0.1 |  |  |  |  |
Common stock, shares outstanding | shares |  |  |  |  | 1,194,793 | 4,901,095
Contingent value rights recovery | $ |  |  |  | $ 200 | $ 200 |
OncoGenex Pharmaceuticals, Inc [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Reverse stock split ratio |  | 0.0909 | 0.0909 |  |  |
Share price | $ / shares |  | $ 46.20 |  |  |  |
Common stock, shares outstanding | shares |  | 273,670 |  |  |  |
Number of non-transferable contingent value rights with potential cash and other consideration receivable right | Right |  | 1 |  |  |  |
OncoGenex Pharmaceuticals, Inc [Member] | Contingent Value Rights [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Combined company acquisition period results |  | 5 years |  |  |  |
Aggregate consideration distributed to the holders, consideration received percent |  | 80.00% |  |  |  |
OncoGenex Pharmaceuticals, Inc [Member] | Stock Price [Member] | Warrant [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Fair value of outstanding warrants, assumptions |  | 46.20 |  |  |  |
OncoGenex Pharmaceuticals, Inc [Member] | Risk-Free Interest [Member] | Warrant [Member] | Minimum [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Fair value of outstanding warrants, assumptions |  | 1.32 |  |  |  |
OncoGenex Pharmaceuticals, Inc [Member] | Risk-Free Interest [Member] | Warrant [Member] | Maximum [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Fair value of outstanding warrants, assumptions |  | 1.53 |  |  |  |
OncoGenex Pharmaceuticals, Inc [Member] | Expected Lives [Member] | Warrant [Member] | Minimum [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Fair value of outstanding warrants, assumptions |  | 1 year 10 months 28 days |  |  |  |
OncoGenex Pharmaceuticals, Inc [Member] | Expected Lives [Member] | Warrant [Member] | Maximum [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Fair value of outstanding warrants, assumptions |  | 3 years 2 months 26 days |  |  |  |
OncoGenex Pharmaceuticals, Inc [Member] | Volatility [Member] | Warrant [Member] | Minimum [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Fair value of outstanding warrants, assumptions |  | 90.33 |  |  |  |
OncoGenex Pharmaceuticals, Inc [Member] | Volatility [Member] | Warrant [Member] | Maximum [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Fair value of outstanding warrants, assumptions |  | 106.08 |  |  |  |
OncoGenex Pharmaceuticals, Inc [Member] | Stock Options [Member] | Stock Price [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Fair value of stock options, assumptions |  | 46.20 |  |  |  |
OncoGenex Pharmaceuticals, Inc [Member] | Stock Options [Member] | Volatility [Member] | Minimum [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Fair value of stock options, assumptions |  | 97.23 |  |  |  |
OncoGenex Pharmaceuticals, Inc [Member] | Stock Options [Member] | Volatility [Member] | Maximum [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Fair value of stock options, assumptions |  | 106.63 |  |  |  |
OncoGenex Pharmaceuticals, Inc [Member] | Stock Options [Member] | Risk-Free Interest [Member] | Minimum [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Fair value of stock options, assumptions |  | 1.31 |  |  |  |
OncoGenex Pharmaceuticals, Inc [Member] | Stock Options [Member] | Risk-Free Interest [Member] | Maximum [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Fair value of stock options, assumptions |  | 1.54 |  |  |  |
OncoGenex Pharmaceuticals, Inc [Member] | Stock Options [Member] | Expected Lives [Member] | Minimum [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Fair value of stock options, assumptions | Year |  | 1.82 |  |  |  |
OncoGenex Pharmaceuticals, Inc [Member] | Stock Options [Member] | Expected Lives [Member] | Maximum [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Fair value of stock options, assumptions | Year |  | 3.31 |  |  |  |

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