Goodwill and Intangible Asset - Additional Information (Details) - USD ($) |
9 Months Ended | |
|---|---|---|
Jul. 31, 2018 |
Oct. 31, 2017 |
|
| Goodwill And Intangible Assets Disclosure [Abstract] | ||
| Goodwill | $ 4,075,000 | $ 4,075,000 |
| Intangible asset | 9,592,000 | $ 9,592,000 |
| Goodwill and intangible asset, impairment | $ 0 |