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Stockholders' Equity (Details Textual) (USD $)
 3 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Aug. 31, 2009
2009 Unit Offering [Member]
Nov. 30, 2010
2010 Unit Offering [Member]
Jun. 30, 2012
Series B preferred stock [Member]
Dec. 31, 2011
Series B preferred stock [Member]
Mar. 31, 1999
Series B preferred stock [Member]
Jun. 30, 2012
Sales Agreement [Member]
Dec. 31, 2011
Sales Agreement [Member]
Jun. 30, 2012
Stockholder Rights Plan [Member]
Aug. 31, 2009
Common stock [Member]
2009 Unit Offering [Member]
Nov. 30, 2010
Common stock [Member]
2010 Unit Offering [Member]
Aug. 31, 2009
Warrant [Member]
2009 Unit Offering [Member]
Jun. 30, 2012
Warrant [Member]
2009 Unit Offering [Member]
Nov. 30, 2010
Warrant [Member]
2010 Unit Offering [Member]
Jun. 30, 2012
Warrant [Member]
2010 Unit Offering [Member]
Dec. 31, 2011
Warrant [Member]
2010 Unit Offering [Member]
Stockholders' Equity (Textual) [Abstract]                                        
Preferred stock issued                   3,327                    
Preferred stock conversion basis to common shares               100                        
Common stock isssued to Fenwal     332,700                                  
Conversion of Preferred stock to Common Stock               3,327                        
Conversion of Preferred Stock To Common Stock Date     Jun. 30, 2012                                  
Redeemable preferred stock, amount                 $ 9,500,000                      
Proceeds from units sold under offering           12,100,000 19,700,000                          
Fees and Stock Issuance Costs Associated with Unit Offering           1,100,000 1,300,000                          
Each unit           One share of common stock and a warrant to purchase 4/10 of a share of common stock One share of common stock and a warrant to purchase 1/2 of a share of common stock                          
Units from offering           6,000,000 7,400,000                          
Common stock issued                           6,000,000 7,400,000          
Warrants to purchase an aggregate shares of common stock                               2,400,000   3,700,000    
Warrants Conversion Ratio                               0.4   0.5    
Common Stock Conversion Ratio                           1 1          
Unit price           $ 2.20 $ 2.85                          
Warrants exercise price                               2.90   3.20    
Exercisable Period                                 5 years   5 years  
Warrant liability 8,749,000   8,749,000   7,979,000                     2,800,000   5,800,000    
Risk-free rate                               2.48%   1.23%    
Expected term                               5 years   5 years    
Dividend yield                               0.00%   0.00%    
Volatility                               77.00%   85.00%    
Warrants exercised                                     5,084 0
Maximum common stock offering price                     20,000,000                  
Percentage of proceeds payable as compensation to underwriter                     3.00%                  
Common stock, sold                     3,100,000 3,500,000                
Minimum Percentage Of Common Stock Acquired By Stockholders                         15.00%              
Designated preferred stock for future issuance                         250,000              
Proceeds from common stock sold     9,876,000 0             9,500,000 9,700,000                
Stockholders' Equity (Additional Textual) [Abstract]                                        
Revaluation of warrant liability $ 3,674,000 $ (339,000) $ (787,000) $ (1,617,000)