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Equity Financings and Warrants (Details) (USD $)
 3 Months Ended 135 Months Ended 3 Months Ended 1 Months Ended
Mar. 31, 2013
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2013
Warrant
Mar. 31, 2013
Warrant
Maximum
Mar. 31, 2013
Warrant
Minimum
Mar. 31, 2013
2013 Equity Financings
Jan. 22, 2013
PIPE Transaction
2013 Equity Financings
Jan. 22, 2013
PIPE Transaction
2013 Equity Financings
Warrant
Jan. 31, 2013
Registered Direct Offering
2013 Equity Financings
Jan. 31, 2013
Registered Direct Offering
2013 Equity Financings
Warrant
Jan. 31, 2013
Registered Direct Offering
2011 Equity Financings
Equity financings and warrants (Textual) [Abstract]                        
Common stock, shares issued 3,185,562 3,185,562 2,660,315         356,430   164,636    
Additional shares purchased               249,501   65,855    
Aggregate gross proceeds               $ 1,000,000   $ 730,000    
Proceeds from the issuance of common stock $ 1,741,000 $ 15,850,000         $ 1,400,000 $ 805,000   $ 616,000    
Public Equity Offering Close Date               Jan. 25, 2013        
Shares of common stock purchased                 0.70   0.40  
Purchase price for common stock unit               2.81   4.43    
Warrants were exercisable upon issuance, expiry year               7 years   5 years    
Closing bid price of the common stock               100.00%        
Warrant price per share       7.25 116.89 1.80   2.28   4.13    
Registered Direct Offering Close Date                       Feb. 04, 2013
Number of warrants outstanding       1,300,000.0