Share Based Compensation - Summary of Changes in Stock Option Plan (Details) - $ / shares |
3 Months Ended | |
|---|---|---|
Jan. 31, 2017 |
Jan. 31, 2016 |
|
| Disclosure of Compensation Related Costs, Share-based Payments [Abstract] | ||
| Beginning Balance | 3,351,795 | |
| Number of Options, Granted | 556,952 | 1,385,000 |
| Number of Options, Exercised | ||
| Number of Options, Expired | (11,189) | |
| Ending Balance | 3,897,558 | |
| Number of Options, Vested and Exercisable | 1,800,252 | |
| Weighted-Average Exercise Price, Outstanding, Beginning | $ 13.31 | |
| Weighted-Average Exercise Price, Granted | 7.71 | |
| Weighted-Average Exercise Price, Exercised | ||
| Weighted-Average Exercise Price, Expired | 17.88 | |
| Weighted-Average Exercise Price, Outstanding, Ending | 12.50 | |
| Weighted-Average Exercise Price, Vested and Exercisable | $ 13.46 | |