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Stock Based Compensation (Details) (USD $)
9 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 28, 2012
Sep. 30, 2012
Range $ 1.96 - 3.00 [Member]
Sep. 30, 2012
Range $ 3.01 -7.00 [Member]
Sep. 30, 2012
Range $ 7.01 - 8.50 [Member]
Sep. 30, 2012
Range $ 8.51 - 32.55 [Member]
Sep. 30, 2012
Employees [Member]
Sep. 30, 2011
Employees [Member]
Sep. 30, 2012
Employees [Member]
Sep. 30, 2011
Employees [Member]
Sep. 30, 2012
Non-Employees [Member]
Sep. 30, 2011
Non-Employees [Member]
Sep. 30, 2012
Non-Employees [Member]
Sep. 30, 2011
Non-Employees [Member]
Sep. 30, 2012
Research and Development Expense [Member]
Employees [Member]
Sep. 30, 2011
Research and Development Expense [Member]
Employees [Member]
Sep. 30, 2012
Research and Development Expense [Member]
Employees [Member]
Sep. 30, 2011
Research and Development Expense [Member]
Employees [Member]
Sep. 30, 2012
Research and Development Expense [Member]
Non-Employees [Member]
Sep. 30, 2011
Research and Development Expense [Member]
Non-Employees [Member]
Sep. 30, 2012
Research and Development Expense [Member]
Non-Employees [Member]
Sep. 30, 2011
Research and Development Expense [Member]
Non-Employees [Member]
Sep. 30, 2012
General and Administrative Expense [Member]
Employees [Member]
Sep. 30, 2011
General and Administrative Expense [Member]
Employees [Member]
Sep. 30, 2012
General and Administrative Expense [Member]
Employees [Member]
Sep. 30, 2011
General and Administrative Expense [Member]
Employees [Member]
Sep. 30, 2012
General and Administrative Expense [Member]
Non-Employees [Member]
Sep. 30, 2011
General and Administrative Expense [Member]
Non-Employees [Member]
Sep. 30, 2012
General and Administrative Expense [Member]
Non-Employees [Member]
Sep. 30, 2011
General and Administrative Expense [Member]
Non-Employees [Member]
Sep. 30, 2012
Minimum [Member]
Sep. 30, 2012
Maximum [Member]
Sep. 30, 2012
Employees [Member]
Sep. 30, 2011
Employees [Member]
Sep. 30, 2012
Non-employees [Member]
Sep. 30, 2012
Senior management [Member]
Sep. 30, 2011
Senior management [Member]
Sep. 30, 2012
Directors and non-employees [Member]
Sep. 30, 2011
Directors and non-employees [Member]
Sep. 30, 2012
2000 Long Term Incentive Plan [Member]
Sep. 30, 2012
2008 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                                                    
Common stock reserved for future issuance (in shares)                                                                                 1,400,000 10,000,000
Share-based compensation, shares subject to stock options (in shares)                                                                                 1,000,000 900,000
Share-based compensation, shares available for future grant (in shares)                                                                                 0 4,100,000
Common stock reserved after reverse spilt for future issuance (in shares)                                                                                   5,000,000
Reverse stock split conversation ratio 1-for-7                                                                                  
Share-based compensation arrangement by share-based payment award, fair value assumptions and methodology [Abstract]                                                                                    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Method Used Black-Scholes option-pricing model                                                                                  
Risk-free interest rate (in hundredths) 1.54% 2.05%                                                                                
Expected volatility, Minimum (in hundredths) 89.70% 87.70%                                                                                
Expected volatility, Maximum (in hundredths) 97.70% 90.00%                                                                                
Expected lives   6 years                                                           6 years 10 years                  
Expected dividend yield (in hundredths) 0.00% 0.00%                                                                                
Estimated annualized forfeiture rate (in hundredths)                                                                   14.00% 13.00%   2.00% 2.00% 0.00% 0.00%    
Unrecognized compensation expense related to unvested stock options, granted $ 900,000                                                                                  
Unrecognized compensation cost, recognized as expense over a weighted-average period 11 months 23 days                                                                                  
Number of Options (Employees and Non-Employees) [Abstract]                                                                                    
Outstanding at beginning of period (in shares) 1,907,495                                                                 1,763,923   143,572            
Granted (in shares) 53,502                                                                 53,502   0            
Exercised (in shares) (2,500)                                                                 (1,071)   (1,429)            
Forfeited or expired (in shares) (38,528)                                                                 (38,528)   0            
Outstanding at end of period (in shares) 1,919,969                                                                 1,777,826   142,143            
Options exercisable at end of period (in shares) 1,438,878                                                                 1,314,592   124,286            
Weighted-Average Exercise Price Options [Abstract]                                                                                    
Outstanding at beginning of period (in dollars per share) $ 6.06                                                                                  
Granted (in dollars per share) $ 2.77                                                                                  
Exercised (in dollars per share) $ 2.88                                                                                  
Forfeited or expired (in dollars per share) $ 4.52                                                                                  
Outstanding at end of period (in dollars per share) $ 5.97                                                                                  
Options exercisable at end of period (in dollars per share) $ 6.82                                                                                  
Number of Unvested Stock Options (Employees and Non-Employees) [Abstract]                                                                                    
Non-vested at beginning of period (in shares) 711,361                                                                 693,504   17,857            
Granted, unvested stock options (in shares) 53,502                                                                 53,502   0            
Forfeited or expired, unvested stock options (in shares) (38,528)                                                                 (38,528)   0            
Vested (in shares) (245,244)                                                                 (245,244)   0            
Non-vested at end of period (in shares) 481,091                                                                 463,234   17,857            
Weighted-Average Grant Date Fair Value per Share [Abstract]                                                                                    
Non-vested at beginning of period (in dollars per share) $ 3.28                                                                                  
Granted, unvested stock options (in dollars per share) $ 2.32                                                                                  
Forfeited or expired, unvested stock options (in dollars per share) $ 3.50                                                                                  
Vested (in dollars per share) $ 3.38                                                                                  
Non-vested at end of period (in dollars per share) $ 3.08                                                                                  
Total stock-based compensation expense resulting from stock options and warrants [Abstract]                                                                                    
Allocated employee and non-employee stock-based compensation expense, Total               273,106 283,538 903,551 996,133 177,617 (1,411) 406,109 128,381 95,715 80,581 289,081 251,902 0 10,246 0 51,730 177,391 202,957 614,470 744,231 177,617 (11,657) 406,109 76,651                      
Share-based compensation arrangement by share-based payment award, shares issued in period (in shares) 53,502                                                                                  
Share based compensation, shares authorized under significant ranges of outstanding stock option plans in period [Abstract]                                                                                    
Range of Exercise Prices, Lower Range (in dollars per share)       $ 1.96 $ 3.01 $ 7.01 $ 8.51                                                                      
Range of Exercise Prices, Upper Range (in dollars per share)       $ 3.00 $ 7.00 $ 8.50 $ 32.55                                                                      
Number of Options (in shares) 1,919,969     631,075 202,799 944,688 141,407                                                                      
Weighted-Average Remaining Contractual Life 6 years 2 months 12 days     8 years 6 months 26 days 5 years 7 months 10 days 5 years 4 months 17 days 2 years 29 days                                                                      
Weighted-Average Exercise Price (in dollars per share) $ 5.97     $ 2.29 $ 5.39 $ 7.66 $ 12.75                                                                      
Number of Options Exercisable (in shares) 1,438,878     281,401 196,037 826,600 134,840                                                                      
Weighted-Average Contractual Life 6 years 2 months 12 days     8 years 6 months 26 days 5 years 7 months 10 days 5 years 4 months 17 days 2 years 29 days                                                                      
Weighted-Average Exercise Price, Options Exercisable (in dollars per share) $ 6.82     $ 2.42 $ 5.40 $ 7.72 $ 12.75                                                                      
The aggregate intrinsic value of outstanding options $ 1,400,000                                                                                  
Closing price of the common stock (in dollars per share)     $ 3.63