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Warrant Liability (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 1 Months Ended 3 Months Ended 9 Months Ended
Jul. 31, 2008
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Warrant Liability [Abstract]          
Units issued in direct offering 6,686,650     12,600,000  
Common shares per unit 1        
Proceeds from direct offering $ 17,500        
Shares entitled per warrant 0.5        
Aggregate shares common stock callable by warrants 3,343,325        
Exercise price of warrants 3.62        
Change in fair value of warrant liability      $ (401) $ 267 $ (401)
Equity issuance, price per share $ 2.68