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Stock Warrants (Changes in Warrants) (Detail)
 9 Months Ended
Sep. 30, 2015
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Class Of Warrant Or Right [Line Items]  
Warrants Outstanding at December 31, 2014 5,236,660
Exercised During the Period (4,721,517)
Issued During the Period 60,000
Expired During the Period (14,814)
Warrants Outstanding, September 30, 2015 560,329