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Condensed Consolidated Statements of Stockholders' Equity Deficit - 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, 2014 $ 18,145   $ (51) $ 264,689 $ (246,513) $ 20
Balance (in shares) at Dec. 31, 2014   5 (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    
Sale of common stock, net of expenses 8,479     8,479    
Sale of common stock, net of expenses (in shares)   4        
Exercise of warrants 176     176    
Fair value of warrants issued classified as liability (4,247)     (4,247)    
Fair value of warrants exercised 123     123    
Net income (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   9 (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    
Sale of common stock, net of expenses 1,011     1,011    
Sale of common stock, net of expenses (in shares)   2        
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)   10        
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)   3        
Fair value of warrants issued classified as liability (707)     (707)    
Fair value of warrants exercised 726     726    
Net income (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   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 $ 0   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)   227,287        
Fair value of beneficial conversion feature of convertible note 4,908     4,908    
Series B preferred stock dividend (527)       (527)  
Exercise of warrants 19     19    
Exercise of warrants (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 income (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   228,140 (1)      
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Compensation expense for issuance of stock options 7     7    
Compensation expense for issuance of restricted stock 14     14    
Sale of common stock, net of expenses 4,252 $ 7   4,245    
Sale of common stock, net of expenses (in shares)   668,855        
Fair value of warrants issued (18,306)     (18,306)    
Net income (loss) 7,187       7,187  
Foreign currency translation (34)          
Total comprehensive loss (34)         (34)
Balance at Mar. 31, 2018 $ (6,202) $ 9 $ (51) $ 311,477 $ (317,645) $ 8
Balance (in shares) at Mar. 31, 2018   896,995 (1)