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Subsequent Events (Details) (USD $)
6 Months Ended 1 Months Ended 1 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Aug. 08, 2013
Subsequent Event [Member]
Dec. 31, 2012
Share Distribution [Member]
Aug. 08, 2013
Share Distribution [Member]
Subsequent Event [Member]
Subsequent Event [Line Items]          
Common stock sold under sales agreement 8,222,966     9,344,611 4,248,455
Proceeds from issuance of common stock and warrants $ 19,556,383 $ 0     $ 6,100,000
Common Sock Issued, Shares, Warrants         5,273,392
Proceeds from Warrant Exercises     $ 5,300,000