Income Taxes - Additional Information (Detail) - USD ($) |
12 Months Ended | |
|---|---|---|
May 31, 2016 |
May 31, 2015 |
|
| Schedule Of Income Taxes [Line Items] | ||
| Federal statutory income tax rate | 34.00% | 34.00% |
| Net operating loss | $ 69,149,000 | |
| X | ||||||||||
- Definition Schedule Of Income Taxes [Line Items] No definition available.
|
| X | ||||||||||
- 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.
|
| X | ||||||||||
- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|