Quarterly report pursuant to Section 13 or 15(d)

Stock Warrants (Changes in Warrants) (Detail)

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Stock Warrants (Changes in Warrants) (Detail)
9 Months Ended
Sep. 30, 2018
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Class Of Warrant Or Right [Line Items]  
Warrants Outstanding at December 31, 2017 1,184,912
Exercised During the Period (113,850)
Issued During the Period 1,200,000
Expired During the Period (8,000)
Warrants Outstanding at September 30, 2018 2,263,062