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Derivative Financial Instruments - Additional Information (Detail) (USD $)	1 Months Ended
	Apr. 30, 2011 Stockholders	Jul. 31, 2013	May 10, 2012	Nov. 30, 2011	Nov. 08, 2011	Oct. 31, 2010
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Holders of Series G Preferred Stock	2
Percentage increase in share price	1.00%
Issued warrants to acquire common shares	525,000		260,417			1,800,000
Common shares issuable upon exercise of warrant				1,302,083
Shares available for issuance upon exercise			434,027		434,027
Original principal amount		$ 10,000,000	$ 8,000,000

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- Definition

Issued warrants to acquire common shares.

+ References

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- Definition

Number of preferred shareholders considered for separate agreement to issue warrants.

+ References

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- Definition

Number of securities called by warrants or rights upon additional financing.

+ References

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- Definition

Redemption price increment percentage.

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- Definition

Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(i)(2))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph i

-Subparagraph 2

-Article 4

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400

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