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Stock Based Compensation (Details) (USD $)
3 Months Ended 6 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2012
Jun. 30, 2011
Jun. 29, 2012
Jun. 30, 2012
Range $ 1.96 - 3.00 [Member]
Jun. 30, 2012
Range $ 3.01 -7.00 [Member]
Jun. 30, 2012
Range $ 7.01 - 8.50 [Member]
Jun. 30, 2012
Range $ 8.51 - 32.55 [Member]
Jun. 30, 2012
Employees [Member]
Jun. 30, 2011
Employees [Member]
Jun. 30, 2012
Employees [Member]
Jun. 30, 2011
Employees [Member]
Jun. 30, 2012
Non-Employees [Member]
Jun. 30, 2011
Non-Employees [Member]
Jun. 30, 2012
Non-Employees [Member]
Jun. 30, 2011
Non-Employees [Member]
Jun. 30, 2012
Research and Development Expense [Member]
Employees [Member]
Jun. 30, 2011
Research and Development Expense [Member]
Employees [Member]
Jun. 30, 2012
Research and Development Expense [Member]
Employees [Member]
Jun. 30, 2011
Research and Development Expense [Member]
Employees [Member]
Jun. 30, 2012
Research and Development Expense [Member]
Non-Employees [Member]
Jun. 30, 2011
Research and Development Expense [Member]
Non-Employees [Member]
Jun. 30, 2012
Research and Development Expense [Member]
Non-Employees [Member]
Jun. 30, 2011
Research and Development Expense [Member]
Non-Employees [Member]
Jun. 30, 2012
General and Administrative Expense [Member]
Employees [Member]
Jun. 30, 2011
General and Administrative Expense [Member]
Employees [Member]
Jun. 30, 2012
General and Administrative Expense [Member]
Employees [Member]
Jun. 30, 2011
General and Administrative Expense [Member]
Employees [Member]
Jun. 30, 2012
General and Administrative Expense [Member]
Non-Employees [Member]
Jun. 30, 2011
General and Administrative Expense [Member]
Non-Employees [Member]
Jun. 30, 2012
General and Administrative Expense [Member]
Non-Employees [Member]
Jun. 30, 2011
General and Administrative Expense [Member]
Non-Employees [Member]
Jun. 30, 2012
Maximum [Member]
Jun. 30, 2012
Minimum [Member]
Jun. 30, 2012
Employees [Member]
Jun. 30, 2011
Employees [Member]
Jun. 30, 2012
Non-employees [Member]
Jun. 30, 2012
Senior management [Member]
Jun. 30, 2011
Senior management [Member]
Jun. 30, 2012
Directors and non-employees [Member]
Jun. 30, 2011
Directors and non-employees [Member]
Jun. 30, 2012
2000 Long Term Incentive Plan [Member]
Jun. 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% 2.13%                                                                                
Expected volatility, Minimum (in hundredths)   89.70%                                                                                  
Expected volatility, Maximum (in hundredths) 97.70%                                                                                    
Expected Volatility (in hundredths)     87.69%                                                                                
Expected lives     10 years                                                           10 years 6 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 $ 1,200,000 $ 1,200,000                                                                                  
Unrecognized compensation cost, recognized as expense over a weighted-average period   1 year 1 month 2 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)                                                                 (2,500)   0            
Forfeited or expired (in shares)   (26,384)                                                                 (26,384)   0            
Outstanding at end of period (in shares) 1,932,113 1,932,113                                                                 1,788,541   143,572            
Options exercisable at end of period (in shares) 1,364,260 1,364,260                                                                 1,238,545   125,715            
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)   $ 4.97                                                                                  
Outstanding at end of period (in dollars per share) $ 5.99 $ 5.99                                                                                  
Options exercisable at end of period (in dollars per share) $ 6.94 $ 6.94                                                                                  
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)   (26,384)                                                                 (26,384)   0            
Vested (in shares)   (173,181)                                                                 (173,181)   0            
Non-vested at end of period (in shares) 565,298 565,298                                                                 547,441   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)   $ 3.88                                                                                  
Vested (in dollars per share)   $ 3.26                                                                                  
Non-vested at end of period (in dollars per share) $ 3.18 $ 3.18                                                                                  
Total stock-based compensation expense resulting from stock options and warrants [Abstract]                                                                                      
Allocated employee and non-employee stock-based compensation expense, Total                 361,249 431,572 630,445 712,595 176,074 62,484 228,492 129,789 98,242 87,890 193,366 171,321 0 19,576 0 41,484 263,007 343,682 437,079 541,274 176,074 42,908 228,492 88,305                      
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) 1,932,113 1,932,113     648,768 204,942 946,117 132,284                                                                      
Weighted-Average Remaining Contractual Life   6 years 5 months 26 days     8 years 9 months 29 days 5 years 10 months 17 days 5 years 7 months 20 days 2 years 3 months 29 days                                                                      
Weighted-Average Exercise Price (in dollars per share) $ 5.99 $ 5.99     $ 2.29 $ 5.40 $ 7.66 $ 12.75                                                                      
Number of Options Exercisable (in shares) 1,364,260 1,364,260     245,220 195,680 791,074 132,286                                                                      
Weighted-Average Contractual Life   6 years 5 months 26 days     8 years 9 months 29 days 5 years 10 months 17 days 5 years 7 months 20 days 2 years 3 months 29 days                                                                      
Weighted-Average Exercise Price, Options Exercisable (in dollars per share) $ 6.96 $ 6.96     $ 2.46 $ 5.39 $ 7.74 $ 12.75                                                                      
The aggregate intrinsic value of outstanding options $ 2,700,000 $ 2,700,000                                                                                  
Closing price of the common stock (in dollars per share)       $ 4.58