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Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Feb. 29, 2016	Feb. 28, 2015	Feb. 29, 2016	Feb. 28, 2015
Income Tax Contingency [Line Items]
Deferred tax assets	$ 49,800,000		$ 49,800,000
Federal net operating loss and tax credit carryforwards	34,500,000		34,500,000
State net operating loss carryforwards	8,000,000		8,000,000
Differences between financial and tax reporting	7,300,000		7,300,000
Income tax expense	0	$ 0	0	$ 0
Federal [Member]
Income Tax Contingency [Line Items]
Income tax expense			17,000
State [Member]
Income Tax Contingency [Line Items]
Federal net operating loss and tax credit carryforwards	17,000		17,000
State net operating loss carryforwards	$ 97,000		97,000
Income tax expense			$ 97,000
Minimum [Member] | Federal [Member]
Income Tax Contingency [Line Items]
Net operating loss and tax credit carryforwards life expectancy			12 years
Minimum [Member] | State [Member]
Income Tax Contingency [Line Items]
Net operating loss and tax credit carryforwards life expectancy			1 year
Maximum [Member] | Federal [Member]
Income Tax Contingency [Line Items]
Net operating loss and tax credit carryforwards life expectancy			20 years
Maximum [Member] | State [Member]
Income Tax Contingency [Line Items]
Net operating loss and tax credit carryforwards life expectancy			20 years

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