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Statement of Stockholder's Equity (Parenthetical) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Issuance cost on issuance of common stock and warrants $ 900,992 $ 1,522,083 $ 480,835
Common Stock
      
Issuance cost on issuance of common stock and warrants 900,992 1,522,083 480,835
Additional Paid-in Capital
      
Issuance cost on issuance of common stock and warrants $ 900,992 $ 1,522,083 $ 480,835