Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2015	Sep. 30, 2014
Income Tax Disclosure [Abstract]
Estimated annual effective tax rate	2.85%	2.85%
Income tax benefit	$ (99,000)	$ (99,000)
Effective tax rate		0.297%	0.00%
Unrecognized tax benefits	$ 0	$ 0