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Shareholders' Equity (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2010
Warrants issued (in shares) 747,846 343,748
Proceeds $ 12,250,500 $ 6,409,376
Common Stock [Member]
    
Shares issued (in shares) 3,739,227 1,718,746
July 30, 2012 [Member]
    
Warrants issued (in shares) 117,846  
Unit price (in dollars per share) $ 2.97  
Proceeds 1,745,549 [1]  
July 30, 2012 [Member] | Common Stock [Member]
    
Shares issued (in shares) 589,227  
August 28, 2012 [Member]
    
Warrants issued (in shares) 380,000  
Unit price (in dollars per share) $ 2.97  
Proceeds 5,229,201 [2]  
August 28, 2012 [Member] | Common Stock [Member]
    
Shares issued (in shares) 1,900,000  
October 3 2012 [Member]
    
Warrants issued (in shares) 250,000  
Unit price (in dollars per share) $ 4.49  
Proceeds 5,275,750 [3]  
October 3 2012 [Member] | Common Stock [Member]
    
Shares issued (in shares) 1,250,000  
March 3 2010 [Member]
    
Warrants issued (in shares)   117,719
Unit price (in dollars per share)   $ 2.75
Proceeds   1,618,653
March 3 2010 [Member] | Common Stock [Member]
    
Shares issued (in shares)   588,602
September 17 2010 [Member]
    
Warrants issued (in shares)   128,205
Unit price (in dollars per share)   $ 3.9
Proceeds   2,490,723 [4]
September 17 2010 [Member] | Common Stock [Member]
    
Shares issued (in shares)   641,026
September 27 2010 [Member]
    
Shares issued (in shares)   194,118
Warrants issued (in shares)   38,824
Unit price (in dollars per share)   $ 4.25
Proceeds   825,000
December 1 2010 [Member]
    
Warrants issued (in shares)   59,000
Unit price (in dollars per share)   $ 5
Proceeds   $ 1,475,000
December 1 2010 [Member] | Common Stock [Member]
    
Shares issued (in shares)   295,000
[1] Net of fees of $4,455
[2] Net of fees of $413,719
[3] Net of fees of $336,750
[4] Net of fees of $9,277