Quarterly report pursuant to Section 13 or 15(d)

Warrants - Summary of Warrant Activity (Detail)

v3.8.0.1
Warrants - Summary of Warrant Activity (Detail) - $ / shares
3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Class of Warrant or Right [Line Items]    
Warrants, Beginning balance 2,177,425 17,559
Warrants, Granted   2,177,425
Warrants, Exercised 0 0
Warrants, Expired   (17,559)
Warrants, Ending balance 2,177,425 2,177,425
Weighted Average [Member]    
Class of Warrant or Right [Line Items]    
Weighted Average Price, Beginning balance $ 3.10 $ 1.50
Weighted Average Price, Granted   3.10
Weighted Average Price, Exercised 0 0
Weighted Average Price, Expired   1.50
Weighted Average Price, Ending balance $ 3.10 $ 3.10