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Stock Options Plans (Details) (USD $)
9 Months Ended 12 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Sep. 30, 2013
Restricted Stock [Member]
Sep. 30, 2012
Restricted Stock [Member]
Sep. 30, 2013
Restricted Stock [Member]
Sep. 30, 2012
Restricted Stock [Member]
Sep. 30, 2013
Stock Options [Member]
Sep. 30, 2012
Stock Options [Member]
Sep. 30, 2013
Minimum [Member]
Sep. 30, 2013
Minimum [Member]
Stock Options [Member]
Sep. 30, 2012
Minimum [Member]
Stock Options [Member]
Sep. 30, 2013
Maximum [Member]
Sep. 30, 2013
Maximum [Member]
Stock Options [Member]
Sep. 30, 2012
Maximum [Member]
Stock Options [Member]
Sep. 30, 2013
2004 Stock Incentive Plan [Member]
Sep. 30, 2013
2009 Stock Incentive Plan [Member]
Sep. 30, 2013
Options granted to employees [Member]
Stock Options [Member]
Sep. 30, 2012
Options granted to employees [Member]
Stock Options [Member]
Sep. 30, 2013
Options granted to employees [Member]
Stock Options [Member]
Sep. 30, 2012
Options granted to employees [Member]
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                          
Shares reserved for the issuance (in shares)                               3,000,000 6,500,000        
Period for options to be vested from date of grant, maximum 10 years                                        
Stock Options [Roll Forward]                                          
Outstanding at December 31, 2012 (in shares) 4,788,887                                        
Granted (in shares) 943,020                                        
Forfeited (in shares) (1,000,773)                                        
Expired (in shares) (20,000)                                        
Outstanding at September 30, 2013 (in shares) 4,711,134   4,788,887                                    
Stock Options, Exercise Price per Share [Roll Forward]                                          
Outstanding at December 31, 2012 (in dollars per share)                   $ 1.23     $ 15.54                
Granted (in dollars per share)                   $ 0.37     $ 2.13                
Forfeited (in dollars per share)                   $ 1.31     $ 8.50                
Expired (in dollars per share) $ 1.87                                        
Outstanding at September 30, 2013 (in dollars per share)                   $ 0.37     $ 15.54                
Weighted Average Exercise Price [Roll Forward]                                          
Outstanding at December 31, 2012 (in dollars per share) $ 4.79                                        
Granted (in dollars per share) $ 2.04                                        
Forfeited (in dollars per share) $ 3.63                                        
Expired (in dollars per share) $ 1.87                                        
Outstanding at September 30, 2013 (in dollars per share) $ 4.50   $ 4.79                                    
Weighted Average Remaining Life [Abstract]                                          
Weighted Average Remaining Life 6 years 3 months 18 days   6 years 10 months 17 days                                    
Recognized compensation expense $ 407,000 $ 2,159,000     $ 300,000 $ 200,000 $ 800,000                       $ 800,000 $ 400,000 $ 2,100,000
Recognized compensation income       $ 100,000                           $ 200,000      
Assumptions used to determine the fair value of stock options [Abstract]                                          
Dividend yield (in hundredths)               0.00% 0.00%                        
Expected volatility (in hundredths)                     86.16% 77.37%   93.91% 84.47%            
Weighted average volatility (in hundredths)               86.37% 79.87%                        
Risk-free interest rates (in hundredths)                     0.99% 0.78%   1.79% 1.49%            
Expected life               6 years 8 months 12 days 6 years                        
Restricted Stock [Roll Forward]                                          
Outstanding at December 31, 2012 (in shares)           501,468                              
Granted (in shares)           259,750                              
Vested (in shares)           (317,337)                              
Forfeited (in shares)           (103,986)                              
Outstanding at September 30, 2013 (in shares)       339,895   339,895                              
Weighted Average Exercise Price [Roll Forward]                                          
Outstanding at December 31, 2012 (in dollars per share)           $ 3.26                              
Granted (in dollars per share)           $ 0.43                              
Vested (in dollars per share)           $ 2.58                              
Forfeited (in dollars per share)           $ 4.29                              
Outstanding at September 30, 2013 (in dollars per share)       $ 1.41   $ 1.41