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Benefit Plans (Tables) | 12 Months Ended
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Oct. 31, 2012
Note 9. Share-Based Compensation Plans [Abstract] |
Schedule of Assumptions Used [Table Text Block] | 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:
|  | 2012 |  | 2011 |  | 2010
Expected life (in years) |  | 7.0 |  |  | 7.0 |  |  | 7.0 |
Risk free interest rate |  | 1.6 | % |  | 3.0 | % |  | 3.4 | %
Volatility |  | 75.5 | % |  | 73.0 | % |  | 72.2 | %
Dividends yield |  | — | % |  | — | % |  | — | %
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block] | Share-based compensation was reflected in the consolidated statements of operations as follows:
|  | 2012 |  | 2011 |  | 2010
Cost of product sales and revenues |  | $ | 497 |  |  | $ | 726 |  |  | $ | 761 |
Cost of research and development contracts |  | 90 |  |  | 115 |  |  | 175 |
General and administrative expense |  | 1,182 |  |  | 1,275 |  |  | 1,397 |
Research and development expense |  | 280 |  |  | 457 |  |  | 627 |
Total share-based compensation |  | $ | 2,049 |  |  | $ | 2,573 |  |  | $ | 2,960 |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] | The following table summarizes our stock option activity for the year ended October 31, 2012:
|  |  |  | Weighted- Average Option
Options |  | Shares |  | Price
Outstanding at October 31, 2011 |  | 3,320,558 |  |  | $ | 8.25 |
Granted |  | 342,293 |  |  | $ | 1.28 |
Exercised |  | — |  |  | $ | — |
Cancelled |  | (542,395 | ) |  | $ | 11.30 |
Outstanding at October 31, 2012 |  | 3,120,456 |  |  | $ | 6.96 |
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] | The following table summarizes information about stock options outstanding and exercisable at October 31, 2012:
|  | Options Outstanding |  | Options Exercisable
|  |  |  | Weighted Average |  | Weighted Average |  |  |  | Weighted Average
Range of |  | Number |  | Remaining |  | Exercise |  | Number |  | Exercise
Exercise Prices |  | outstanding |  | Contractual Life |  | Price |  | exercisable |  | Price
$0.26 — $5.10 |  | 942,041 |  |  | 8.2 |  | $ | 2.09 |  |  | 855,066 |  |  | $ | 2.17 |
$5.11 — $9.92 |  | 1,451,717 |  |  | 4.0 |  | $ | 7.83 |  |  | 1,451,717 |  |  | $ | 7.83 |
$9.93 — $14.74 |  | 715,198 |  |  | 2.7 |  | $ | 11.45 |  |  | 715,198 |  |  | $ | 11.45 |
$14.75 — $19.56 |  | 11,500 |  |  | 1.1 |  | $ | 16.12 |  |  | 11,500 |  |  | $ | 16.12 |
|  | 3,120,456 |  |  | 4.9 |  | $ | 6.96 |  |  | 3,033,481 |  |  | $ | 7.12 |

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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=21915506&loc=d3e1928-114920 + 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=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph f -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + 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)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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