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Stock-Based Compensation Arrangements (Details 4) (USD $)
 12 Months Ended 209 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
May 23, 2012
Stock-based compensation          
Number of shares reserved for issuance         10,000,000
Number of shares reserved for issuance before amendment         5,200,000
Compensation cost $ 357,000 $ 380,000 $ 882,000    
Cash proceeds   94,000 3,000 267,000  
Stock option exercised (in shares)   33,351 948    
Stock options
          
Stock-based compensation          
Expiration period 10 years        
Vesting period 4 years        
Weighted average grant-date fair value (in dollars per share) $ 3.25 $ 2.52 $ 8.05    
Total remaining unrecognized compensation cost 1,500,000     1,500,000  
Weighted-average remaining requisite service period of recognition of unrecognized compensation cost 2 years 9 months 29 days        
Cash proceeds   100,000 3,000    
Total intrinsic value of options exercised   100,000 7,000    
Income tax benefits recorded for share based payments   0 0    
Granted (in shares) 494,663 33,571      
Stock option exercised (in shares)    33,351 948    
Stock options | Employees and directors
          
Stock-based compensation          
Grant date fair value 1,600,000 100,000 200,000    
Compensation cost $ 400,000 $ 12,000 $ 24,000    
Weighted average grant-date fair value (in dollars per share) $ 3.25 $ 2.52 $ 8.05    
Granted (in shares) 494,663 33,571 28,500