Income Taxes - Additional Information (Detail) - Jun. 30, 2015 - USD ($)	Total
Income Tax Disclosure [Line Items]
Alternative Minimum Tax Credit	$ 518,000
Valuation allowance	1,543,000
Liability relating to uncertain tax positions	255,000
Income tax benefits, research and development credit	0
Federal
Income Tax Disclosure [Line Items]
Research and development tax credit carryforward	2,022,000
State
Income Tax Disclosure [Line Items]
Research and development tax credit carryforward	$ 1,767,000