Share Based Compensation - Summary of Share-based Compensation Expense (Details) - USD ($) |
3 Months Ended | |
|---|---|---|
Jan. 31, 2017 |
Jan. 31, 2016 |
|
| Share-based compensation expense | $ 5,110,425 | $ 9,529,008 |
| Research and Development [Member] | ||
| Share-based compensation expense | 1,222,483 | 5,106,640 |
| General and Administrative [Member] | ||
| Share-based compensation expense | $ 3,887,942 | $ 4,422,368 |