Stock Warrants (Changes in Warrants) (Detail) - shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Class Of Warrant Or Right [Line Items]
Warrants Outstanding, Beginning of Year	5,236,660	7,147,775
Exercised During the Year	(4,746,755)	(1,285,746)
Issued During the Year	60,000	0
Forfeited During the Year	(14,814)	(625,369)
Warrants Outstanding, End of Year	535,091	5,236,660