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)
3 Months Ended
Mar. 31, 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 (27,500)
Issued During the Period 1,200,000
Expired During the Period 0
Warrants Outstanding at March 31, 2018 2,357,412