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 $)
6 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Equity [Abstract]    
Beginning balance, Warrant (in shares) 3,235,982 306,388
Granted (in shares)   2,942,094
Exercised (in shares) (200,000)  
Expired (in Shares) (288,888) (12,500)
Ending balance, Warrant (in shares) 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