Income Tax - Additional Information (Detail) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2015	Sep. 30, 2014
Income Tax Disclosure [Abstract]
Percentage of annual effective income tax expense		25.16%
Income taxes paid	$ 0	$ 0
Valuation allowance	$ 28,500,000	$ 28,500,000	$ 0
Federal statutory rate	35.00%
Increase in estimated valuation allowance	$ 19,000,000