Stockholders' Equity - Summary of Stock Options Outstanding (Detail) (USD $)				12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 $ 1.00 - 5.00 [Member]	Dec. 31, 2013 $ 5.01 - 10.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, minimum				$ 1.00	$ 5.01
Range of Exercise Prices, maximum				$ 5.00	$ 10.00
Number Outstanding	4,192,927			3,230,768	962,159
Weighted Average Remaining Contractual Life (Years)				5 years 5 months 23 days	4 years 7 days
Weighted Average Exercise Price				$ 3.10	$ 6.25
Aggregate Intrinsic Value	$ 9,145,780	$ 4,572,205