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CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY - 6 months ended Jun. 30, 2016 - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Deficit [Member]
Treasury Stock [Member]
Senior Notes [Member]
Senior Secured Debentures [Member]
Senior Notes [Member]
Senior Secured Debentures [Member]
Additional Paid-in Capital [Member]
Beginning balance, shares at Dec. 31, 2015   162,581,753          
Beginning balance at Dec. 31, 2015 $ 13,513 $ 15 $ 296,730 $ (279,383) $ (3,849)    
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Issuance of common stock, shares   19,772,727          
Issuance of common stock 20,189 $ 3 20,186        
Common stock warrants issued (5,590)   (5,590)     $ (1,139) $ (1,139)
Issuance of common stock upon exercise of warrants, shares   408,058          
Issuance of common stock upon exercise of warrants 557 $ 0 557        
Issuance of common stock in connection with employee stock purchase plan, shares   67,017          
Issuance of common stock in connection with employee stock purchase plan 78   78        
Stock-based compensation for directors and employees $ 1,278   1,278        
Exercise of stock options, shares 167,000 166,830          
Exercise of stock options $ 261   261        
Net loss (11,104)     (11,104)      
Ending balance, shares at Jun. 30, 2016   182,996,385          
Ending balance at Jun. 30, 2016 $ 20,321 $ 18 $ 314,639 $ (290,487) $ (3,849)