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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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