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Condensed Consolidated Statements of Stockholders' Deficit (Unaudited) - 9 months ended Sep. 30, 2018 - USD ($)
$ in Thousands
Total
Common Stock Issued [Member]
Treasury Stock [Member]
Additional Paid in Capital [Member]
Accumulated Deficit [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Balance at Dec. 31, 2017 $ 678 $ 3 $ (51) $ 325,516 $ (324,832) $ 42
Balance (in shares) at Dec. 31, 2017   263,275 (1)      
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Compensation income for issuance of stock options (40)     (40)    
Compensation expense for issuance of restricted stock 35 $ 1   34    
Compensation expense for issuance of restricted stock (in shares)   60,000        
Sale of common stock, net of expenses 11,277 $ 53   11,224    
Sale of common stock, net of expenses (in shares)   5,336,665        
Cashless exercise of warrants (in shares)   34,497        
Issuance of pre-funded warrants 520     520    
Fair value of warrants issued in Feb 2018 public offering (18,306)     (18,306)    
Fair value of warrants issued with Convertible Notes 5,007     5,007    
Fair value of warrants reclassified from liability to equity 4,210     4,210    
Beneficial conversion feature of convertible note 44     44    
Net loss (8,353)       (8,353)  
Total comprehensive loss 63         63
Balance at Sep. 30, 2018 $ (4,865) $ 57 $ (51) $ 328,209 $ (333,185) $ 105
Balance (in shares) at Sep. 30, 2018   5,694,437 (1)