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Benefit Plans (Tables) | 12 Months Ended
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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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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the changes in other outstanding share-based compensation awards other than stock options or nonvested awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of employee stock purchase plan activity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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