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Consolidated Statements of Stockholders' Equity (Deficit) - USD ($)
$ in Thousands
Total
Series D Preferred Stock [Member]
Common Stock Issued [Member]
Preferred Stock Issued [Member]
Preferred Stock Issued [Member]
Series D Preferred Stock [Member]
In Treasury [Member]
Additional Paid-in Capital [Member]
Additional Paid-in Capital [Member]
Series D Preferred Stock [Member]
Accumulated Deficit [Member]
Accumulated Other Comprehensive (loss) income [Member]
Balance at Dec. 31, 2016 $ (1,490)         $ (51) $ 277,790   $ (279,188) $ (41)
Balance (in shares) at Dec. 31, 2016     24     (1)        
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Compensation expense for issuance of stock options 50           50      
Compensation expense for issuance of restricted stock 79           79      
Issuance of common stock and rights for payments made in shares on convertible notes payable 40,121   $ 2       40,119      
Issuance of common stock and rights for payments made in shares on convertible notes payable (in shares)     262,462              
Fair value of beneficial conversion feature of convertible note 4,908           4,908      
Series B preferred stock dividend (527)               (527)  
Warrants exercised 19           19      
Warrants exercised (in shares)     736              
Fair value of warrants exercised 2,552           2,552      
Adjustment for rounding related to Nov 2017 reverse stock split, (in shares)     93              
Net loss (45,117)               (45,117)  
Foreign currency translation 83                 83
Balance at Dec. 31, 2017 678   $ 2     $ (51) 325,517   (324,832) 42
Balance (in shares) at Dec. 31, 2017     263,315     (1)        
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Compensation income related to cancellation of stock options (40)           (40)      
Compensation expense for issuance of restricted stock 98   $ 2       96      
Compensation expense for issuance of restricted stock (in shares)     164,989              
Sale of common stock, net of expenses 10,916   $ 54       10,862      
Sale of common stock, net of expenses (in shares)     5,336,665              
Fair value of warrants issued in Feb 2018 public offering (18,306)           (18,306)      
Cashless exercise of warrants (in shares)     34,467              
Issuance of pre-funded warrants 520           520      
Exercise of pre-funded warrants     $ 37       (37)      
Exercise of pre-funded warrants (in shares)     3,675,516              
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      
Fair value of beneficial conversion feature of convertible note 44           44      
Issuance of Series D Preferred Stock   $ 1,004           $ 1,004    
Issuance of Series D Preferred Stock (in shares)         101          
Exchange of warrants for common stock     $ 8       (8)      
Exchange of warrants for common stock (in shares)     825,002              
Fair value of warrants exchanged for common stock 144           144      
Retirement of Treasury Stock           $ 51 (51)      
Retirement of Treasury Stock (in shares)           1        
Net loss (19,222)               (19,222)  
Foreign currency translation 8                 8
Balance at Dec. 31, 2018 $ (14,939)   $ 103     $ 0 $ 328,962   $ (344,054) $ 50
Balance (in shares) at Dec. 31, 2018     10,299,954 101