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, 2015
Dec. 31, 2014
Dec. 31, 2013
Class of Warrant or Right [Line Items]      
Exercise Price $ 1.50 $ 1.93 $ 1.91
Warrants Outstanding 361,169 2,532,094 2,747,094
Exercise Price 1.50 [Member]      
Class of Warrant or Right [Line Items]      
Exercise Price $ 1.50    
Warrants Outstanding 361,169    
Expiration Dates Jul. 31, 2017