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Consolidated Statements of Stockholders' Equity (Deficit) - USD ($)
$ in Thousands
Total
Common Stock Issued [Member]
In Treasury [Member]
Additional Paid-in Capital [Member]
Accumulated Deficit [Member]
Accumulated Other Comprehensive (loss) income [Member]
Balance at Dec. 31, 2014 $ 18,145   $ (51) $ 264,689 $ (246,513) $ 20
Balance (in shares) at Dec. 31, 2014   1,740 (1)      
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Compensation expense for issuance of stock options 349     349    
Compensation expense for issuance of restricted stock 308     308    
Compensation expense for issuance of restricted stock (in shares)   103        
Sale of common stock, net of expenses 8,479     8,479    
Sale of common stock, net of expenses (in shares)   2,109        
Exercise of warrants 176     176    
Exercise of warrants (in shares)   39        
Fair value of warrants issued classified as liability (4,247)     (4,247)    
Fair value of warrants exercised 123     123    
Net loss (14,704)       (14,704)  
Foreign currency translation (28)         (28)
Balance at Dec. 31, 2015 8,601   $ (51) 269,877 (261,217) (8)
Balance (in shares) at Dec. 31, 2015   3,991 (1)      
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Compensation expense for issuance of stock options 161     161    
Compensation expense for issuance of restricted stock 266     266    
Compensation expense for issuance of restricted stock (in shares)   7        
Sale of common stock, net of expenses 1,011     1,011    
Sale of common stock, net of expenses (in shares)   1,223        
Issuance of common stock and rights for payments made in shares on convertible notes payable 649     649    
Issuance of common stock and rights for payments made in shares on convertible notes payable (in shares)   5,158        
Fair value of beneficial conversion feature of convertible note 4,435     4,435    
Exercise of warrants 1,372     1,372    
Exercise of warrants (in shares)   1,426        
Fair value of warrants issued classified as liability (707)     (707)    
Fair value of warrants exercised 726     726    
Net loss (17,971)       (17,971)  
Foreign currency translation (33)         (33)
Balance at Dec. 31, 2016 (1,490)   $ (51) 277,790 (279,188) (41)
Balance (in shares) at Dec. 31, 2016   11,805 (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 $ 0   79    
Compensation expense for issuance of restricted stock (in shares)   261        
Issuance of common stock and rights for payments made in shares on convertible notes payable 40,121 $ 1,137   38,984    
Issuance of common stock and rights for payments made in shares on convertible notes payable (in shares)   113,643,624        
Fair value of beneficial conversion feature of convertible note 4,908     4,908    
Series B preferred stock dividend (527)       (527)  
Exercise of warrants 19 $ 4   15    
Exercise of warrants (in shares)   367,950        
Fair value of warrants exercised 2,552     2,552    
Adjustment for rounding related to Nov 2017 reverse stock split, (in shares)   31,211        
Net loss (45,117)       (45,117)  
Foreign currency translation 83         83
Balance at Dec. 31, 2017 $ 678 $ 1,141 $ (51) $ 324,378 $ (324,832) $ 42
Balance (in shares) at Dec. 31, 2017   114,054,851 (1)