Summary of Status of Warrants Activities (Detail) (USD $)	9 Months Ended
	Sep. 30, 2013
Warrants Outstanding
Outstanding at beginning of period	1,388,358
Granted	2,800,000
Exercised	(2,500,000)
Outstanding at end of period	1,688,358
Weighted average exercise price
Outstanding at beginning of period	$ 1.57
Granted	$ 1.80
Exercised	$ 1.80
Outstanding at end of period	$ 1.61
Average remaining life in years
Outstanding at beginning of period	2 years 14 days
Granted	3 months
Outstanding at end of period	1 year 1 month 10 days