Quarterly report pursuant to Section 13 or 15(d)

Warrants - Summary of Warrants Outstanding (Detail)

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Warrants - Summary of Warrants Outstanding (Detail) - $ / shares
6 Months Ended
Jun. 30, 2018
Apr. 06, 2018
Dec. 31, 2017
Dec. 31, 2016
Class of Warrant or Right [Line Items]        
Exercise Price   $ 2.00    
Warrants Outstanding 3,077,425   2,177,425 17,559
Class One [Member]        
Class of Warrant or Right [Line Items]        
Exercise Price $ 3.10      
Warrants Outstanding 48,387      
Expiration Date Sep. 19, 2022      
Class Two [Member]        
Class of Warrant or Right [Line Items]        
Exercise Price $ 3.10      
Warrants Outstanding 462,106      
Expiration Date May 10, 2024      
Class Three [Member]        
Class of Warrant or Right [Line Items]        
Exercise Price $ 3.10      
Warrants Outstanding 602,414      
Expiration Date Jul. 25, 2024      
Class Four [Member]        
Class of Warrant or Right [Line Items]        
Exercise Price $ 3.10      
Warrants Outstanding 1,064,518      
Expiration Date Nov. 08, 2024      
Class Five [Member]        
Class of Warrant or Right [Line Items]        
Exercise Price $ 2.00      
Warrants Outstanding 900,000      
Expiration Date Apr. 10, 2023