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Net Loss per Share Applicable to Common Shareholder - Net Loss per Share (Detail) - shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Earnings Per Share [Abstract]    
Common stock options 3,584,150 65,430
Common stock warrants - equity treatment 2,548,632 2,556,133
Common stock warrants - liability treatment 49,557,865 103,284
Excluded potentially dilutive securities 55,690,647 2,724,847