Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Income Tax Disclosure [Abstract]
Income tax expense (benefit)	$ 236,000	$ 188,000
Pre-tax loss	9,424,000	8,118,000
Income tax benefit recognized with respect to losses incurred	0
Income tax expense with respect to earnings	0
Uncertain tax benefits gross	1,581,000
Interest and penalties related to unrecognized tax benefits	$ 0