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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Detail) - Black-Scholes options-pricing model | 12 Months Ended
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May 31, 2012 | May 31, 2011
Dividend yield | 0.00% | 0.00%
Expected volatility | 77.76-84.97% | 85.97-86.42%
Risk free interest rate | 0.63-0.76% | 1.87-2.27%
Expected life | 3.25-3.75 years | 3.75 years

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- Definition Expected term of share-based compensation awards, in range. + References No definition available. + Details
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- Definition The estimated measure of the percentage in range 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 No definition available. + Details
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- Definition The risk-free interest rate assumption expressed in range that is used in valuing an option on its own shares. + References No definition available. + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + 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)(iii) -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of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph e(2)(c) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. + Details
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