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Benefit Plans - Schedule of Fair Value of Stock Options Estimated on Grant Date (Details)	12 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Expected life (in years)	7 years	7 years	7 years
Risk free interest rate	2.80%	2.20%	1.50%
Volatility	72.70%	79.50%	80.10%
Dividend yield	0.00%	0.00%	0.00%

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- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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-Subparagraph (f)(2)(iii)
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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Weighted average expected volatility rate of share-based compensation awards.

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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- Definition

Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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