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CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY - 6 months ended Jun. 30, 2017 - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-In Capital
Accumulated Deficit
Treasury Stock
Beginning balance, shares at Dec. 31, 2016   15,224,223      
Beginning balance at Dec. 31, 2016 $ 28,657 $ 2 $ 335,436 $ (302,932) $ (3,849)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of common stock, shares   17,000,000      
Issuance of common stock, net of $356 in issuance costs 15,524 $ 2 15,522    
Common stock warrants issued (10,357)   (10,357)    
Issuance of common stock upon exercise of warrants, shares   5,150,660      
Issuance of common stock upon exercise of warrants 4,913   4,913    
Issuance of common stock in connection with employee stock purchase plan, shares   4,048      
Issuance of common stock in connection with employee stock purchase plan 5   5    
Stock-based compensation for directors and employees 425   425    
Fair value of common stock in exchange for services, shares   90,343      
Fair value of common stock in exchange for services 82   82    
Net loss (20,122)     (20,122)  
Ending balance, shares at Jun. 30, 2017   37,469,274      
Ending balance at Jun. 30, 2017 $ 19,127 $ 4 $ 346,026 $ (323,054) $ (3,849)