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)
Sep. 30, 2013
Dec. 31, 2012
Dec. 31, 2011
Class of Warrant or Right [Line Items]      
Warrants Outstanding 2,747,094 3,235,982 306,388
Range 1 [Member]
     
Class of Warrant or Right [Line Items]      
Exercise Price 1.50    
Warrants Outstanding 571,169    
Expiration Dates Jul. 30, 2017    
Range 2 [Member]
     
Class of Warrant or Right [Line Items]      
Exercise Price 2.00    
Warrants Outstanding 2,170,925    
Expiration Dates Mar. 23, 2015    
Range 3 [Member]
     
Class of Warrant or Right [Line Items]      
Exercise Price 10.00    
Warrants Outstanding 5,000    
Expiration Dates Apr. 15, 2014