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CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY - 9 months ended Sep. 30, 2015 - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Deficit [Member]
Treasury Stock [Member]
Beginning balance, shares at Dec. 31, 2014   130,146,341      
Beginning balance at Dec. 31, 2014 $ 37,059 $ 12 $ 256,377 $ (215,481) $ (3,849)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of common stock, shares   32,158,685      
Issuance of common stock 47,416 $ 3 47,413    
Issuance of common stock upon exercise of warrants, shares   0      
Common stock warrants issued in connection with March 2015 common stock offering (10,296) $ 0 (10,296)    
Issuance of common stock in connection with employee stock purchase plan, shares   231,312      
Issuance of common stock in connection with employee stock purchase plan 309   309    
Stock-based compensation for directors and employees $ 2,122   2,122    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 39,000 39,108      
Stock Issued During Period, Value, Stock Options Exercised $ 31   31    
Net loss (44,224)     (44,224)  
Ending balance, shares at Sep. 30, 2015   162,575,446      
Ending balance at Sep. 30, 2015 $ 32,417 $ 15 $ 295,956 $ (259,705) $ (3,849)