Annual report pursuant to Section 13 and 15(d)

Stock Warrants (Changes in Warrants) (Detail)

v3.19.1
Stock Warrants (Changes in Warrants) (Detail) - shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Class Of Warrant Or Right [Line Items]      
Warrants Outstanding, Beginning of Year 1,184,912 401,859 535,091
Exercised During the Year (113,850) (250,009) (133,232)
Issued During the Year 1,200,000 1,033,062 0
Expired During the Year (38,000) 0 0
Warrants Outstanding, End of Year 2,233,062 1,184,912 401,859