Warrants - Additional Information (Detail) (USD $)	9 Months Ended		0 Months Ended	1 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Apr. 15, 2013	Jan. 10, 2013 Warrant	Jan. 31, 2013 Warrant	Sep. 30, 2013 Warrant	Dec. 31, 2009 Warrant	Dec. 31, 2008 Warrant
Class Of Warrant Or Right [Line Items]
Granted	$ 1.80		$ 1.80
Fair value assumptions, expected volatility rate					27.98%
Fair value assumptions, risk free interest rate					0.14%
Fair value assumptions, expected term					1 year
Fair value of warrants					$ 72,724
Warrants issued	2,800,000		2,800,000	300,000		969,358	125,000
Cash payment		$ 4,500,000
Warrants issued, exercise price		1.80		1.80		0.996	1.196
Warrants outstanding, common Stock shares to be acquired by warrant		2,500,000