Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Operating Loss Carryforwards, Expiration Date	Various years through 2033
Increase in operating loss carryforwards	$ 5,159,000
Operating loss carryforwards	48,913,000	43,754,000
Net deferred tax asset recognized	$ 0	$ 0
Change period for unrecognized tax benefits	12 months