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Related Party Transaction - Additional Information (Detail) |  |  |  |  |  |  |  | 9 Months Ended | 12 Months Ended | 16 Months Ended | 20 Months Ended |
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Jul. 24, 2017 USD ($) $ / shares shares | Jul. 20, 2017 shares | Jul. 19, 2017 shares | Jul. 18, 2017 USD ($) $ / shares shares | Mar. 07, 2017 USD ($) | Sep. 30, 2015 USD ($) $ / shares shares | May 18, 2015 USD ($) | Sep. 30, 2017 USD ($) $ / shares | Sep. 30, 2016 USD ($) | Dec. 31, 2016 USD ($) NotesPayable $ / shares | Dec. 31, 2016 USD ($) $ / shares | Dec. 31, 2016 USD ($) $ / shares | Jul. 31, 2017 USD ($)
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts payable, related parties |  |  |  |  |  |  |  |  |  | $ 829,000 | $ 829,000 | $ 829,000 |
Common stock, par value | $ / shares |  |  |  |  |  |  |  | $ 0.001 |  | $ 0.001 | $ 0.001 | $ 0.001 |
Ricanto, Ltd [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Consulting fees incurred, related parties |  |  |  |  |  |  |  | $ 0 | $ 100,000 |  |  |  |
Related party consulting agreement, date of termination |  |  |  |  |  |  |  | Aug. 01, 2017 |  |  |  |  |
Accounts payable, related parties |  |  |  | $ 600,000 |  |  |  | $ 0 |  | $ 600,000 | $ 600,000 | $ 600,000 |
Shares issued to related party for services | shares |  |  |  | 475 |  |  |  |  |  |  |  |  |
Shares issued to related party, par value | $ / shares |  |  |  | $ 0.01 |  |  |  |  |  |  |  |  |
Ricanto, Ltd [Member] | OncoGenex Pharmaceuticals, Inc [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of each outstanding share of Achieve common stock , shares converted | shares |  |  |  | 359.3053 |  |  |  |  |  |  |  |  |
Number of shares post-conversion | shares |  |  |  | 170,670 |  |  |  |  |  |  |  |  |
Chief Executive Officer [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts payable, related parties |  |  |  |  |  |  |  | 0 |  |  |  |  |
Notes payable, related parties |  |  |  |  |  |  |  |  |  | $ 200,000 | 200,000 | 200,000 |
Number of notes payable | NotesPayable |  |  |  |  |  |  |  |  |  | 2 |  |  |
Notes payable, rate of interest |  |  |  |  |  |  |  |  |  | 3.50% |  |  |
Notes payable repayment period |  |  |  |  |  |  |  |  |  | 1 year |  |  |
Outstanding principal, included in shareholder loans |  |  |  |  |  |  |  |  |  | $ 200,000 | 200,000 | 200,000 |
Accrued interest owed to related party |  |  |  |  |  |  |  | 0 |  | 3,000 | 3,000 | 3,000 |
Salary paid |  |  |  |  |  |  |  |  |  |  |  | 0 |
Chief Executive Officer [Member] | Accrued Compensation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued salaries |  |  |  |  |  |  |  |  |  | 700,000 | 700,000 | 700,000 |
Accrued salaries, common stock shares issued | shares |  |  | 238 |  |  |  |  |  |  |  |  |  |
Percentage of common stock issued in settlement of accrued salaries |  |  | 50.00% |  |  |  |  |  |  |  |  |  |
Percentage of cash payment in settlement of accrued salaries |  |  | 50.00% |  |  |  |  |  |  |  |  |  |
Chief Executive Officer [Member] | Accrued Liabilities Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts payable, related parties |  |  |  |  |  |  |  | 300,000 |  |  |  |  |
Chief Executive Officer [Member] | Convertible Notes Payable [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued to related party, par value | $ / shares | $ 0.01 |  |  |  |  |  |  |  |  |  |  |  |
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] |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of each outstanding share of Achieve common stock , shares converted | shares | 359.3014 |  | 359.3025 |  |  |  |  |  |  |  |  |  |
Number of shares post-conversion | shares | 52,458 |  | 85,514 |  |  |  |  |  |  |  |  |  |
Lender |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts payable, related parties |  |  |  |  |  |  |  | 0 |  | 700,000 | 700,000 | 700,000 |
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 |  | 35,000 | 35,000 | 35,000 |
Debt conversion, converted instrument, amount | $ 800,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt conversion, converted instrument, shares issued | shares | 586 |  |  |  |  |  |  |  |  |  |  |  |
Common stock, par value | $ / shares | $ 0.01 |  |  |  |  |  |  |  |  |  |  |  |
Lender | Convertible Promissory Note [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Notes payable, related parties |  |  |  |  |  |  | $ 2,700,000 |  |  |  |  |  |
Notes payable, rate of interest |  |  |  |  |  |  | 3.50% |  |  |  |  |  |
Debt conversion, converted instrument, amount |  |  |  |  |  | $ 2,000,000 |  |  |  |  |  |  |
Debt conversion, converted instrument, shares issued | shares |  |  |  |  |  | 4,500 |  |  |  |  |  |  |
Common stock, par value | $ / shares |  |  |  |  |  | $ 0.01 |  |  |  |  |  |  |
Lender | OncoGenex Pharmaceuticals, Inc [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of each outstanding share of Achieve common stock , shares converted | shares | 359.3052 |  |  |  |  |  |  |  |  |  |  |  |
Number of shares post-conversion | shares | 1,827,426 |  |  |  |  |  |  |  |  |  |  |  |
Chief Financial Officer [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Salary paid |  |  |  |  |  |  |  |  |  |  | 0 |  |
Chief Financial Officer [Member] | Accrued Compensation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued salaries |  |  |  |  |  |  |  |  |  | $ 300,000 | $ 300,000 | $ 300,000 |
Accrued salaries, common stock shares issued | shares |  | 127 |  |  |  |  |  |  |  |  |  |  |
Percentage of common stock issued in settlement of accrued salaries |  | 50.00% |  |  |  |  |  |  |  |  |  |  |
Percentage of cash payment in settlement of accrued salaries |  | 50.00% |  |  |  |  |  |  |  |  |  |  |
Chief Financial Officer [Member] | Accrued Liabilities Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts payable, related parties |  |  |  |  |  |  |  | 200,000 |  |  |  |  |
Chief Financial Officer [Member] | OncoGenex Pharmaceuticals, Inc [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of each outstanding share of Achieve common stock , shares converted | shares |  | 359.2992 |  |  |  |  |  |  |  |  |  |  |
Number of shares post-conversion | shares |  | 45,631 |  |  |  |  |  |  |  |  |  |  |
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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