Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Income Tax Disclosure [Abstract]
Increase in valuation allowance	$ 3,500,000
Valuation allowance	94,300,000
Net deferred tax assets	94,300,000
Income tax expense	$ 20,000	$ 25,000