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Warrants (Detail)
12 Months Ended
Dec. 31, 2017
$ / shares
shares
Stock Warrants  
Number of Shares Underlying Warrants | shares 804,139
Exercise price | $ / shares $ 1.20
Expiration date Mar. 17, 2019
Warrant One [Member]  
Number of Shares Underlying Warrants | shares 240,444
Exercise price | $ / shares $ 0.7875
Expiration date Sep. 24, 2020