Quarterly report pursuant to Section 13 or 15(d)

Warrants - Summary of Warrants Outstanding (Detail)

v3.7.0.1
Warrants - Summary of Warrants Outstanding (Detail) - $ / shares
6 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Dec. 31, 2015
Class of Warrant or Right [Line Items]      
Warrants Outstanding 4,796,621 175,584 175,584
Exercise Price 1.50 [Member]      
Class of Warrant or Right [Line Items]      
Exercise Price $ 1.50    
Warrants Outstanding 175,584    
Expiration Date Jul. 31, 2017    
Exercise Price 0.31 [Member]      
Class of Warrant or Right [Line Items]      
Exercise Price $ 0.31    
Warrants Outstanding 4,621,037    
Expiration Date May 10, 2024