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Capital Availability (Details) - USD ($)
 3 Months Ended 9 Months Ended
May. 05, 2015
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Oct. 31, 2014
Capital Availability [Line Items]              
Net income (loss)   $ 1,527,000 $ (9,385,000) $ (15,981,000) $ (31,612,000)    
Accumulated deficit   $ (354,255,000)   (354,255,000)   $ (338,273,000)  
Net cash used in operating activities       $ (15,946,000) $ (25,374,000)    
Institutional Investors [Member]              
Capital Availability [Line Items]              
Common stock issued, value $ 22,000,000            
Each unit consist of number of common stock and warrant (in shares) 1           1