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Income Taxes - Additional Information (Detail) (USD $) | 12 Months Ended
--- | ---
May 31, 2014 | May 31, 2013
Schedule Of Income Taxes [Line Items] |  |
Federal and state income tax benefit | $ 0 | $ 0
Statutory federal income tax rate | 34.00% | 34.00%
Federal net operating loss and tax credit carryforwards | 30,488,000 | 26,616,000
State net operating loss carryforwards | 7,860,000 | 7,380,000
State net operating loss carryforwards life expectancy, minimum | 5 years |
State net operating loss carryforwards life expectancy, maximum | 20 years |
Interest or penalties related to income tax | 0 | 0
Unrecognized tax benefits | $ 0 | $ 0
Minimum [Member] |  |
Schedule Of Income Taxes [Line Items] |  |
Federal net operating loss and tax credit carryforwards life expectancy | 16 years |
Maximum [Member] |  |
Schedule Of Income Taxes [Line Items] |  |
Federal net operating loss and tax credit carryforwards life expectancy | 20 years |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible domestic operating loss carryforwards. Excludes state and local operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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- Definition The amount of estimated penalties and interest accrued as of the balance sheet date arising from income tax examinations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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