Income Taxes - Changes in Unrecognized Tax Benefits (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Unrecognized tax benefits, Beginning Balance	$ 673,880
Increase in prior year unrecognized tax benefits	40,472	654,701
Increase in current year unrecognized tax benefits	33,684	19,179
Unrecognized tax benefits, Ending Balance	$ 748,036	$ 673,880