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Equity Financings and Warrants (Details) (USD $)
 12 Months Ended 132 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 1 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Dec. 31, 2012
Warrant [Member]
Dec. 31, 2012
Maximum [Member]
Warrant [Member]
Dec. 31, 2012
Minimum [Member]
Warrant [Member]
Jan. 22, 2013
PIPE Transaction [Member]
2013 Equity Financings [Member]
Jan. 22, 2013
PIPE Transaction [Member]
2013 Equity Financings [Member]
Warrant [Member]
Dec. 18, 2012
PIPE Transaction [Member]
2012 Equity Financings [Member]
Oct. 22, 2012
PIPE Transaction [Member]
2012 Equity Financings [Member]
Dec. 18, 2012
PIPE Transaction [Member]
2012 Equity Financings [Member]
Warrant [Member]
Oct. 22, 2012
PIPE Transaction [Member]
2012 Equity Financings [Member]
Warrant [Member]
Dec. 21, 2011
PIPE Transaction [Member]
2011 Equity Financings [Member]
Dec. 31, 2012
PIPE Transaction [Member]
2011 Equity Financings [Member]
Dec. 21, 2011
PIPE Transaction [Member]
2011 Equity Financings [Member]
Warrant [Member]
Jan. 31, 2013
Registered Direct Offering [Member]
2013 Equity Financings [Member]
Jan. 31, 2013
Registered Direct Offering [Member]
2013 Equity Financings [Member]
Warrant [Member]
Aug. 02, 2012
Registered Direct Offering [Member]
2012 Equity Financings [Member]
Dec. 31, 2012
Registered Direct Offering [Member]
2012 Equity Financings [Member]
Aug. 02, 2012
Registered Direct Offering [Member]
2012 Equity Financings [Member]
Warrant [Member]
Jan. 31, 2013
Registered Direct Offering [Member]
2011 Equity Financings [Member]
Apr. 18, 2011
Registered Direct Offering [Member]
2011 Equity Financings [Member]
Dec. 31, 2012
Registered Direct Offering [Member]
2011 Equity Financings [Member]
Apr. 15, 2011
Registered Direct Offering [Member]
2011 Equity Financings [Member]
Apr. 18, 2011
Registered Direct Offering [Member]
2011 Equity Financings [Member]
Warrant [Member]
Equity financings and warrants (Textual) [Abstract]                                                  
Aggregate common stock sold 2,660,315 2,030,500 2,660,315       356,430   86,186 137,530     277,778     164,636   406,099       280,112      
Additional shares purchased 315,356   315,356       249,501   64,640 103,148     208,333     65,855   304,575       196,079      
Aggregate gross proceeds             $ 1,000,000   $ 250,000 $ 325,000     $ 1,750,000     $ 730,000   $ 953,000       $ 3,000,000      
Proceeds from the issuance of common stock 1,528,000 4,726,000 14,109,000       850,000   230,000 280,000     1,500,000     630,000   741,000       2,500,000      
Registered Direct Offering Close Date                         Apr. 21, 2011         Aug. 08, 2011     Feb. 04, 2013        
Public Equity Offering Close Date             Jan. 25, 2013   Dec. 20, 2012 Oct. 25, 2012                         Dec. 21, 2011    
Shares of common stock purchased               0.70     0.75 0.75     0.75   0.40     0.75         0.70
Purchase price for common stock unit             2.81   2.90 2.36     6.30     4.43   2.35       10.71      
Warrants were exercisable upon issuance, expiry year             7 years   5 years 5 years     5 years     5 years   6 years       5 years      
Closing bid price of the common stock             100.00%   100.00%       110.00%                     120.00%  
Number of warrants outstanding       930,725                                          
Warrant price per share       9.10 116.89 1.80 2.28   2.34 1.80     8.91     4.13   2.76           15.12  
Exercisable period of warrants                         6 months           6 months            
Additional Cost Related To Registration Statement                           $ 61,000