Quarterly report pursuant to Section 13 or 15(d)

Common Stock (Details Textual)

v2.4.0.6
Common Stock (Details Textual) (USD $)
In Millions, except Share data, unless otherwise specified
 9 Months Ended 12 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Mar. 27, 2012
Mar. 21, 2012
Sep. 30, 2012
Stock Option [Member]
Sep. 30, 2012
March 2012 Public Offering [Member]
Sep. 30, 2011
March 2012 Public Offering [Member]
Sep. 30, 2012
Minimum [Member]
Sep. 30, 2012
Maximum [Member]
Sep. 30, 2012
Restricted Stock [Member]
Sep. 30, 2012
Restricted Stock [Member]
Dec. 31, 2011
Restricted Stock [Member]
Common Stock (Textual) [Abstract]                          
Options vesting period for directors                 1 year 3 years      
Options expiry period                 7 years 10 years      
Common shares reserved for issuance under various plans           1,273,770              
Common shares reserved for options currently outstanding 790,494   766,328     790,494              
Common shares available for future option grants           483,276              
Restricted stock awards, recognized                     $ 0.2 $ 0.4  
Weighted-average period, Restricted stock awards                       3 years 1 month 24 days  
Restricted stock awards granted                         0
Unrecognized compensation expense related to our restricted stock awards                     0.8 0.8  
Share-based compensation arrangement by share-based payment award, options, exercises in period (116,834)           116,834 54,761          
Common Stock (Additional Textual) [Abstract]                          
Common stock, shares authorized 25,000,000   25,000,000                    
Common stock, par value $ 0.001   $ 0.001                    
Preferred stock, shares authorized 5,000,000                        
Preferred stock, par value $ 0.001                        
Issuance of common stock 14,656,403   9,749,819   4,165,000                
Unrecognized compensation expense related to stock options granted 3.0   2.7                    
Total options and warrants 2,377,795   2,353,629                    
Warrants exercised outstanding 1,587,301                        
Exercise price warrants exercised outstanding $ 20                        
Warrants exercised 0 0                      
Options vesting period for employees over four years                        
Expected expense recognized over period 4 years                        
Purchase price         $ 12.00                
Additional issuance of common stock       624,750                  
Additional issuance of common stock per share       $ 12.00                  
Gross offering amount from the public offering 57.5                        
Net amount received from public offering       $ 53.8                  
Share base compensation by share base payment awards expiration dates expiring in October 2015