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Derivative Financial Instruments - Additional Information (Detail) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Apr. 13, 2014
Oct. 11, 2013
May. 10, 2012
Nov. 08, 2011
Apr. 08, 2011
Oct. 11, 2010
Derivative [Line Items]                
Warrants issued to acquire common shares         260,417 108,507   150,000
Warrants exercisable date Apr. 13, 2014              
Warrants linked to common stock, outstanding 0 0            
Shares available for issuance upon exercise         36,169 36,169    
Additional financing         $ 8,000,000      
Warrants Attached to Series G Preferred Stock [Member]                
Derivative [Line Items]                
Warrants issued to acquire common shares             43,750  
Warrants Attached to Senior Convertible Debt [Member]                
Derivative [Line Items]                
Warrants issued to acquire common shares           108,507    
Warrants linked to common stock, outstanding 130,208              
Common Stock [Member]                
Derivative [Line Items]                
Linked common shares     525,000          
Common Stock [Member] | Level 3 [Member]                
Derivative [Line Items]                
Linked common shares       1,725,000        
Warrants exercisable date   Oct. 11, 2013