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Convertible Instruments - Additional Information (Detail) (USD $)
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3 Months Ended | 9 Months Ended | 12 Months Ended | 124 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | ||||||||||||||
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Feb. 28, 2014
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Feb. 28, 2013
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Feb. 28, 2014
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Feb. 28, 2013
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May 31, 2013
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Feb. 28, 2014
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Feb. 28, 2014
Investor
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May 31, 2013
Investor
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May 31, 2013
Minimum
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Feb. 28, 2014
Minimum
Investor
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May 31, 2013
Minimum
Investor
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May 31, 2013
Maximum
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Feb. 28, 2014
Maximum
Investor
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May 31, 2013
Maximum
Investor
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Feb. 28, 2014
Convertible Note One
Note
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Feb. 28, 2014
Convertible Note Two
Note
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Feb. 28, 2014
Convertible Note Three
Note
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Feb. 28, 2014
Convertible Note Four
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May 31, 2010
Series B convertible preferred stock
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Feb. 28, 2014
Series B convertible preferred stock
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May 31, 2010
Common Stock
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Apr. 30, 2010
Common Stock
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| Class of Stock [Line Items] | ||||||||||||||||||||||
| Preferred Stock, Shares issued | 95,100 | 95,100 | 95,100 | 95,100 | 400,000 | |||||||||||||||||
| Preferred Stock, Share issuance price | $ 5.00 | |||||||||||||||||||||
| Cash proceeds | $ 2,009,000 | |||||||||||||||||||||
| Preferred stock shares outstanding | 95,100 | 95,100 | 95,100 | 95,100 | 95,100 | |||||||||||||||||
| Number of common shares issued upon conversion of preferred stock | 10 | |||||||||||||||||||||
| Convertible note conversion price per share | $ 0.75 | $ 0.75 | $ 0.75 | $ 0.65 | $ 0.65 | $ 0.75 | $ 0.50 | |||||||||||||||
| Common stock shares authorized for issuance | 100,000,000 | 100,000,000 | 100,000,000 | 100,000,000 | 100,000,000 | |||||||||||||||||
| Constructive dividend to Preferred stock holders | 6,000,000 | |||||||||||||||||||||
| Liquidation preference on common shares | $ 5.00 | $ 5.00 | $ 5.00 | |||||||||||||||||||
| Dividends are payable to preferred stock holders | $ 0.25 | |||||||||||||||||||||
| Face amount of notes | 1,200,000 | 1,200,000 | 6,588,250 | 1,200,000 | ||||||||||||||||||
| Convertible note, conversion amount | 4,521,250 | 4,521,250 | 4,521,250 | |||||||||||||||||||
| Number of notes converted | 1 | 1 | 2 | |||||||||||||||||||
| Convertible notes term | 6 months | 6 months | 6 months | 3 years | ||||||||||||||||||
| Principal amount of notes | 2,450,000 | 567,000 | 100,000 | 250,000 | 380,000 | 1,120,000 | ||||||||||||||||
| Aggregate principal amount plus accrued but unpaid interest | 2,151 | 6,351 | ||||||||||||||||||||
| Common stock issued upon conversion of notes | 157,154 | 594,384 | 1,493,333 | |||||||||||||||||||
| Warrants to purchase shares of common stock | 292,307 | |||||||||||||||||||||
| Warrants exercise price per share | 0.50 | 2.00 | 0.75 | |||||||||||||||||||
| Exercisable warrants, expire period | 5 years | |||||||||||||||||||||
| Interest expense associated with conversion inducement | 193,160 | 193,160 | 193,000 | |||||||||||||||||||
| Earliest date for repayment of principal on remaining notes | Oct. 01, 2015 | |||||||||||||||||||||
| Latest date for repayment of principal on remaining notes | Mar. 06, 2016 | |||||||||||||||||||||
| Interest rate on convertible notes | 5.00% | 10.00% | ||||||||||||||||||||
| Interest on convertible notes payment start date | Apr. 01, 2013 | |||||||||||||||||||||
| Common stock warrant term | 2 years | 3 years | ||||||||||||||||||||
| Warrants to purchase common shares, shares | 9,451,056 | |||||||||||||||||||||
| Amortization expense | $ 402,000 | $ 977,000 | $ 3,450,000 | $ 1,235,000 | $ 5,158,000 | |||||||||||||||||