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)
6 Months Ended
Jun. 30, 2017
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Class Of Warrant Or Right [Line Items]  
Warrants Outstanding, Beginning of Year 401,859
Exercised During the Period (250,009)
Issued During the Period 0
Expired During the Period 0
Warrants Outstanding, End of Year 151,850