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Activity Related to Notes (Detail) (USD $)
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3 Months Ended | 6 Months Ended | 109 Months Ended | |
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Nov. 30, 2012
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Nov. 30, 2012
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Nov. 30, 2011
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Nov. 30, 2012
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| Debt Instrument [Line Items] | ||||
| Face amount of notes | $ (5,648,250) | $ (5,648,250) | $ (5,648,250) | |
| Debt discounts | 5,648,250 | 5,648,250 | 5,648,250 | |
| Amortization of debt discount | (257,303) | 257,303 | 2,063 | 976,568 |
| Carrying value of the notes | $ (257,303) | $ (257,303) | $ (257,303) | |
| X | ||||||||||
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- Definition
Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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