Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2015	Sep. 30, 2014
Income Tax Disclosure [Line Items]
Amount of state tax expense	$ 27,000	$ 41,000
Federal [Member]
Income Tax Disclosure [Line Items]
Net operating loss carryforwards	$ 0	$ 0	$ 0