Quarterly report pursuant to Section 13 or 15(d)

Warrants - Summary of Warrant Activity (Detail)

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Warrants - Summary of Warrant Activity (Detail) (USD $)
 9 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Equity [Abstract]    
Warrants, Beginning balance 3,235,982 306,388
Warrants, Granted   2,942,094
Warrants, Exercised (200,000)  
Warrants, Expired (288,888) (12,500)
Warrants, Ending balance 2,747,094 3,235,982
Weighted Average Price, Beginning balance $ 3.53 $ 19.14
Weighted Average Price, Granted   $ 1.87
Weighted Average Price, Exercised $ 1.50  
Weighted Average Price, Expired $ (19.87) $ (6.00)
Weighted Average Price, Ending balance $ 1.91 $ 3.53