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Consolidated Statements of Equity Consolidated Statements of Equity (Parenthetical) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Issuance of common stock for cash, financing costs $ 164,695 $ 41,838 $ 71,839
Issuance of common stock and warrants for cash, financing costs 0 1,300,000  
Warrants For Cash [Member]
      
Issuance of common stock and warrants for cash, financing costs $ 0 $ 314,871