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Related Party Transactions - Additional Information (Detail) |  |  |  |  |  | 9 Months Ended | 12 Months Ended |  |
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Jul. 24, 2017 USD ($) shares | Jul. 20, 2017 USD ($) shares | Jul. 19, 2017 USD ($) shares | Jul. 18, 2017 USD ($) shares | Mar. 07, 2017 USD ($) | Sep. 30, 2016 USD ($) | Dec. 31, 2019 USD ($) $ / shares | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) NotesPayable | Dec. 31, 2018 $ / shares | Jul. 31, 2017 USD ($)
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock, par value | $ / shares |  |  |  |  |  |  | $ 0.001 |  |  | $ 0.001 |
Ricanto, Ltd [Member] |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Consulting fees incurred, related parties |  |  |  |  |  | $ 100,000 |  | $ 0 |  |  |
Related party consulting agreement, date of termination |  |  |  |  |  |  | Aug. 01, 2017 |  |  |  |
Accounts payable, related parties |  |  |  | $ 600,000 |  |  | $ 0 |  |  |  |
Shares issued to related party for services | shares |  |  |  | 475 |  |  |  |  |  |  |
Ricanto, Ltd [Member] | OncoGenex Pharmaceuticals, Inc [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares post-conversion | shares |  |  |  | 17,067 |  |  |  |  |  |  |
Chief Executive Officer [Member] |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Accounts payable, related parties |  |  |  |  |  |  | 0 |  |  |  |
Notes payable, related parties |  |  |  |  |  |  |  |  | $ 200,000 |  |
Number of notes payable | NotesPayable |  |  |  |  |  |  |  |  | 2 |  |
Notes payable, rate of interest |  |  |  |  |  |  |  |  | 3.50% |  |
Notes payable repayment period |  |  |  |  |  |  |  |  | 1 year |  |
Accrued interest owed to related party |  |  |  |  |  |  | 0 |  |  |  |
Chief Executive Officer [Member] | Accrued Compensation [Member] |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Accrued salaries, common stock shares issued | shares |  |  | 238 |  |  |  |  |  |  |  |
Percentage of common stock issued in settlement of accrued salaries |  |  | 50.00% |  |  |  |  |  |  |  |
Salary paid |  |  | $ 400,000 |  |  |  |  |  |  |  |
Percentage of cash payment in settlement of accrued salaries |  |  | 50.00% |  |  |  |  |  |  |  |
Chief Executive Officer [Member] | Convertible Notes Payable [Member] |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt conversion, converted instrument, amount | $ 200,000 |  |  |  |  |  |  |  |  |  |
Debt conversion, converted instrument, shares issued | shares | 146 |  |  |  |  |  |  |  |  |  |
Chief Executive Officer [Member] | OncoGenex Pharmaceuticals, Inc [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares post-conversion | shares | 5,246 |  | 8,551 |  |  |  |  |  |  |  |
Lender [Member] |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Accounts payable, related parties |  |  |  |  |  |  | 0 |  |  |  |
Notes payable, related parties |  |  |  |  | $ 20,000 |  |  |  |  |  |
Notes payable, rate of interest |  |  |  |  | 3.50% |  |  |  |  |  |
Notes payable repayment period |  |  |  |  | 1 year |  |  |  |  |  |
Accrued interest owed to related party |  |  |  |  |  |  | 0 |  |  |  |
Debt conversion, converted instrument, amount | $ 800,000 |  |  |  |  |  |  |  |  |  |
Debt conversion, converted instrument, shares issued | shares | 586 |  |  |  |  |  |  |  |  |  |
Lender [Member] | OncoGenex Pharmaceuticals, Inc [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares post-conversion | shares | 182,743 |  |  |  |  |  |  |  |  |  |
Chief Financial Officer [Member] |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Accounts payable, related parties |  |  |  |  |  |  | 0 |  |  |  |
Accrued interest owed to related party |  |  |  |  |  |  | 0 |  |  |  |
Chief Financial Officer [Member] | Accrued Compensation [Member] |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Accrued salaries, common stock shares issued | shares |  | 127 |  |  |  |  |  |  |  |  |
Percentage of common stock issued in settlement of accrued salaries |  | 50.00% |  |  |  |  |  |  |  |  |
Salary paid |  | $ 200,000 |  |  |  |  |  |  |  |  |
Percentage of cash payment in settlement of accrued salaries |  | 50.00% |  |  |  |  |  |  |  |  |
Chief Financial Officer [Member] | OncoGenex Pharmaceuticals, Inc [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares post-conversion | shares |  | 4,563 |  |  |  |  |  |  |  |  |
Michelle Griffin [Member] | OncoGenex Pharmaceuticals, Inc [Member] |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Termination fee payable |  |  |  |  |  |  |  |  |  |  | $ 600,000
Michelle Griffin [Member] | OncoGenex Pharmaceuticals, Inc [Member] | Accrued Liabilities Other [Member] |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Accounts payable, related parties |  |  |  |  |  |  | $ 0 |  |  |  |

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