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Capital Availability (Details) - USD ($)
 3 Months Ended 6 Months Ended
May. 05, 2015
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Oct. 31, 2014
Capital Availability [Line Items]              
Net income (loss)   $ 4,450,000 $ (11,828,000) $ (17,509,000) $ (22,228,000)    
Accumulated deficit   $ (355,782,000)   (355,782,000)   $ (338,273,000)  
Net cash used in operating activities       $ (9,788,000) $ (18,137,000)    
Institutional Investors [Member]              
Capital Availability [Line Items]              
Common stock issued, value $ 25,000,000            
Each unit consist of number of common stock and warrant (in shares) 1           1