Income Taxes - Additional Information (Detail) - USD ($) $ in Millions |
12 Months Ended | |
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May 31, 2017 |
May 31, 2016 |
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| Schedule Of Income Taxes [Line Items] | ||
| Federal statutory income tax rate | 34.00% | 34.00% |
| Net operating loss | $ 95.6 | |
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- Definition Schedule Of Income Taxes [Line Items] No definition available.
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards that are subject to expiration dates. No definition available.
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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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