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Benefit Plans (Tables)

12 Months Ended

Oct. 31, 2017

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Schedule of Share-Based Compensation Reflected in Consolidated Statement of Operations

Share-based compensation was reflected in the consolidated statements of operations as follows (in thousands):

		2017				2016				2015
Cost of revenues		$	1,050			$	745			$	769
General and administrative expense			2,721				2,110				1,990
Research and development expense			679				504				360
		$	4,450			$	3,359			$	3,119

Schedule of Fair Value of Stock Options Estimated on Grant Date

The fair value of stock options is estimated on the grant date using the Black-Scholes option valuation model and the following weighted-average assumptions:

		2017				2016				2015
Expected life (in years)			7.0				7.0				7.0
Risk free interest rate			2.2	%			1.5	%			1.7	%
Volatility			79.5	%			80.1	%			80.3	%
Dividend yield			—	%			—	%			—	%

Summary of Stock Option Activity

The following table summarizes our stock option activity for the year ended October 31, 2017:

						Weighted- Average Option
Options		Shares				Price
Outstanding as of October 31, 2016			246,923			$	44.88
Granted			103,819			$	1.50
Canceled			(40,792	)		$	94.63
Outstanding as of October 31, 2017			309,950			$	23.81

Summary of Information about Stock Options Outstanding and Exercisable

The following table summarizes information about stock options outstanding and exercisable as of October 31, 2017:

		Options Outstanding												Options Exercisable
						Weighted
						Average				Weighted								Weighted
						Remaining				Average								Average
Range of		Number				Contractual				Exercise				Number				Exercise
Exercise Prices		outstanding				Life				Price				exercisable				Price
$0.00 — $3.23			103,819				9.4			$	1.50				77,865			$	1.50
$3.24 — $61.20			165,164				5.2			$	18.72				161,832			$	18.86
$61.21 — $119.04			40,833				0.3			$	100.78				40,833			$	100.78
$119.05 — $176.88			134				0.6			$	121.56				134			$	121.56
			309,950				6.0			$	23.81				280,664			$	26.00

Summary of RSA and RSU Activity

The following table summarizes our RSA and RSU activity for the year ended October 31, 2017:

						Weighted- Average
Restricted Stock Awards and Units		Shares				Fair Value
Outstanding as of October 31, 2016			990,035				9.52
Granted			2,510,216				1.48
Vested			392,458				12.39
Forfeited			99,107				6.62
Outstanding as of October 31, 2017			3,008,686				2.52

ESPP Activity

ESPP activity for the year ended October 31, 2017 was as follows:

		Number of
ESPP		Shares
Balance as of October 31, 2016			62,226
Issued at $2.85 per share			(25,988	)
Issued at $0.98 per share			(36,168	)
Available for issuance as of October 31, 2017			70

Fair Value of Shares under ESPP Determined at Grant Date

The fair value of shares under the ESPP was determined at the grant date using the Black-Scholes option-pricing model with the following weighted average assumptions:

		2017				2016				2015
Expected life (in years)			0.5				0.5				0.5
Risk free interest rate			0.46	%			0.30	%			0.07	%
Volatility			75.0	%			37.0	%			72.0	%
Dividends yield		—%				—%				—%

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Tabular disclosure of the assumptions used to determine for pension plans and/or other employee benefit plans the benefit obligation and net benefit cost, including assumed discount rates, rate increase in compensation increase, and expected long-term rates of return on plan assets.

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Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits.

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Tabular disclosure of the changes in other outstanding share-based compensation awards other than stock options or nonvested awards.

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Tabular disclosure of employee stock purchase plan activity.

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Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms.

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Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of employee stock purchase plans, including, but not limited to: (a) expected term, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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