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Convertible Preferred Stock and Stock Warrants (Details) (USD $)
 0 Months Ended 12 Months Ended
Jun. 14, 2012
Feb. 04, 2011
Jan. 06, 2011
Aug. 12, 2009
Dec. 31, 2012
Dec. 31, 2011
payment
Dec. 31, 2010
Class of Warrant or Right [Line Items]              
Exercisable Warrants expires         Aug. 12, 2014    
Contingent Warrants expires         Nov. 09, 2014    
Change in fair value of warrant liability         $ (2,649,000) $ (9,571,000) $ 21,464,000
Revalued warrant liability (14,000,000)            
Convertible Preferred Stock And Stock Warrants (Textual) [Abstract]              
Issuance of cumulative convertible preferred stock and warrants       16,000      
Issue price of cumulative convertible preferred stock and warrants       $ 1,000      
Issuance of detachable warrants to acquire common stock       155      
Issuance of detachable Contingent Warrants to acquire common stock       500      
Proceeds from host contract       68.00%      
Net proceeds from host contract       10,800,000      
Fair value of the detachable warrants       5,200,000      
Beneficial conversion discount associated with preferred stock       5,200,000      
Conversion period, in months       36 months      
Convertible Preferred Stock shares issued upon conversion   434.782     434.782    
Conversion price of convertible preferred stock         $ 2.30    
Cumulative convertible preferred stock, liquidation preference         $ 1,000    
Dividends accrued, liquidation preference annual payment rate     15.00%   15.00%    
Preferred stock dividends, value of common stock per share   $ 91.67 $ 208.33        
Common Stock Price Per Share $ 9.53 $ 6.63 $ 4.81     $ 9.96  
Prior business days for volume-weighted average price per share   10 days 10 days        
Conversion of preferred stock into common stock, shares         0 4,871,719  
Number of quarterly dividend payments           8  
Criteria for availing obligation to pay dividend for the shareholders         Previously paid an amount at least eight quarterly dividends    
Stock warrants exercised, shares         348,350 3,960,747  
Cash proceeds from exercise of warrants         $ 421,000 $ 4,793,000 $ 4,453,000
Number of warrants exercisable         1,544,250    
Exercisable [Member]
              
Class of Warrant or Right [Line Items]              
Exercise price of the exercisable warrants       2.31      
Contingent [Member]
              
Class of Warrant or Right [Line Items]              
Exercise price of the exercisable warrants       2.45      
Volatility rate 58.10%     54.00%      
Risk-free rate of return 0.36%     2.70%      
Assumed dividend rate 0.00%     0.00%      
Convertible Preferred Stock And Stock Warrants (Textual) [Abstract]              
Term of warrants       5 years      
Exercisable and Contingent [Member]
              
Class of Warrant or Right [Line Items]              
Exercise price of the exercisable warrants         1.21