Annual report pursuant to Section 13 and 15(d)

Stock Warrants (Changes in Warrants) (Detail)

v3.6.0.2
Stock Warrants (Changes in Warrants) (Detail) - shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Class Of Warrant Or Right [Line Items]    
Warrants Outstanding, Beginning of Year 535,091 5,236,660
Exercised During the Year (133,232) (4,746,755)
Issued During the Year 0 60,000
Forfeited During the Year 0 (14,814)
Warrants Outstanding, End of Year 401,859 535,091