v2.4.0.6
Risks and Uncertainties (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Risks and Uncertainties [Abstract]          
Accumulated deficit $ (320,095,000)   $ (320,095,000)   $ (294,174,000)
Net loss (9,382,000) (34,591,000) (25,923,000) (51,502,000)  
Net cash used in operations     (22,086,000) (24,140,000)  
Borrowings under term loan 20,000,000   20,000,000    
Term loan funded at closing 10,000,000   10,000,000    
Number of shares of common stock issued (in shares)     6,304,102    
Common stock issued, price per share (in dollars per share)     $ 4.07    
Net proceeds from issuance of common stock     $ 25,659,000 $ 32,000