Issue of options under equity incentive plan - Fair value inputs (Detail) (2010 Equity Incentive Plan [Member], USD $)	12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended
Oct. 31, 2012 Options Vested on December 13, 2010 [Member]	Dec. 31, 2010 Options Vested on December 13, 2010 [Member]	Oct. 31, 2012 Options Vested on November 17, 2011 [Member]	Dec. 31, 2010 Options Vested on November 17, 2011 [Member]	Oct. 31, 2012 Options Vesting on November 17, 2012 [Member]	Dec. 31, 2010 Options Vesting on November 17, 2012 [Member]	Oct. 31, 2012 Options Vested on May 1, 2011 [Member]	May 01, 2011 Options Vested on May 1, 2011 [Member]	Oct. 31, 2012 Options Vested on February 1, 2012 [Member]	May 01, 2011 Options Vested on February 1, 2012 [Member]	Oct. 31, 2012 Options Vesting on February 1, 2013 [Member]	May 01, 2011 Options Vesting on February 1, 2013 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date	Dec. 13, 2010		Dec. 13, 2010		Dec. 13, 2010		May 01, 2011		May 01, 2011		May 01, 2011
Grant date share price		$ 1.10		$ 1.10		$ 1.10		$ 1.30		$ 1.30		$ 1.30
Expected life in years	4 years 6 months		5 years		5 years 6 months		3 years 6 months		4 years		4 years 6 months
Risk-free rate	1.91%		1.91%		1.91%		1.04%		2.02%		2.02%
Volatility	95.00%		95.00%		95.00%		100.00%		100.00%		100.00%
Exercise price	$ 1		$ 1		$ 1		$ 1		$ 1		$ 1
Call option value	$ 0.78		$ 0.81		$ 0.83		$ 0.91		$ 0.95		$ 0.99

The date on which stock options were awarded to grantees.

No definition available.

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- Definition

The closing market price per share of the entity's common stock on the date that stock options were awarded.

+ References

No definition available.

+ Details

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- Definition

Agreed-upon price for the exchange of the underlying asset relating to the share-based payment award.

+ References

No definition available.

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 14.D.2)

-URI http://asc.fasb.org/extlink&oid=6793087&loc=d3e301413-122809

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (f)(2)(i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section D

-Subsection 2

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- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

+ 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)(ii)

-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 A240

-Subparagraph e(2)(b)

-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.

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- Definition

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

+ 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)(iv)

-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 A240

-Subparagraph e(2)(d)

-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.

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph c(1)

-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 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (d)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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