Common Stock - Summary of Stock Options Activity (Detail) - $ / shares |
12 Months Ended | |
|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
|
| Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] | ||
| Number of Optioned Common Shares, Additions from OncoGenex Plans | 113,451 | |
| Number of Optioned Common Shares, Granted | 1,052,200 | |
| Number of Optioned Common Shares, Expired | (19,543) | |
| Number of Optioned Common Shares, Exercised | 0 | 0 |
| Number of Optioned Common Shares, Forfeited | (30,461) | |
| Number of Optioned Common Shares, Ending Balance | 1,115,647 | |
| Weighted Average Exercise Price, Additions from OncoGenex Plans | $ 96.38 | |
| Weighted Average Exercise Price, Granted | 2.89 | |
| Weighted Average Exercise Price, Expired | 114.53 | |
| Weighted Average Exercise Price, Forfeited | 92.72 | |
| Weighted Average Exercise Price, Ending Balance | $ 7.99 | |
| X | ||||||||||
- Definition Share based compensation arrangement by share based payment award options additions on reverse takeover. No definition available.
|
| X | ||||||||||
- Definition Share based compensation arrangements by share based payment award options additions on reverse takeover in period weighted average exercise price. No definition available.
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Gross number of share options (or share units) granted during the period. No definition available.
|
| X | ||||||||||
- Definition Number of options outstanding, including both vested and non-vested options. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired. No definition available.
|
| X | ||||||||||
- Definition Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated. No definition available.
|
| X | ||||||||||
- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. No definition available.
|
| X | ||||||||||
- Definition Number of share options (or share units) exercised during the current period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|