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Income Taxes - State Income Taxes and Changes in Deferred Tax Assets Valuation Allowance (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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May 31, 2014 | May 31, 2013
Income Tax Disclosure [Abstract] |  |
Income taxes at statutory federal rate | $ (4,034) | $ (3,574)
State income taxes | 23 | 93
State net operating loss | (480) | (605)
New Energy Efficient Home Credit | (137) | (91)
Increase in deferred tax assets valuation allowance | 4,561 | 4,189
Other, net | 67 | (12)
Income tax benefit | $ 0 | $ 0
Effective tax rate | 0.00% | 0.00%

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