Annual report pursuant to Section 13 and 15(d)

Stock Warrants (Changes in Warrants) (Detail)

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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