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Shareholders' Equity (Details 3) (Warrant [Member], USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2011
Maximum [Member]
Dec. 31, 2010
Maximum [Member]
Dec. 31, 2009
Maximum [Member]
Dec. 31, 2011
Minimum [Member]
Dec. 31, 2010
Minimum [Member]
Dec. 31, 2009
Minimum [Member]
Number of Shares Underlying Warrants and Non-Employee Options Granted, Balance 704,257 708,909 500,161            
Number of Shares Underlying Warrants and Non-Employee Options Granted, Exercised 0 (4,652) 0            
Number of Shares Underlying Warrants and Non-Employee Options Granted, Terminated 0 0 (135,000)            
Number of Shares Underlying Warrants and Non-Employee Options Granted, Issued 807,846 0 343,748            
Number of Shares Underlying Warrants and Non-Employee Options Granted, Balance 1,512,103 704,257 708,909            
Weighted Average Exercise Price, Balance       $ 9.00 $ 9.00 $ 9.00 $ 5.00 $ 5.00 $ 6.00
Weighted Average Exercise Price, Exercised $ 0 $ 5.64 $ 0            
Weighted Average Exercise Price, Terminated $ 0 $ 0 $ 7.5            
Weighted Average Exercise Price, Issued $ 5.12 $ 0 $ 5.91            
Weighted Average Exercise Price, Balance $ 5.56     $ 9.00 $ 9.00 $ 9.00 $ 5.00 $ 5.00 $ 6.00