Summary of Warrant Activity (Detail) (Warrants, USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Warrants
Shares
Beginning Balance	888,000
Exercised	0	0
Ending Balance	888,000
Warrants exercisable, March 31, 2015	753,000
Weighted Average Exercise Price
Beginning Balance	$ 6.04
Ending Balance	$ 6.04
Warrants exercisable at March 31, 2015	$ 6.40