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Condensed Consolidated Statements of Stockholders' Deficit - USD ($)
$ in Thousands
Total
Common Stock Issued [Member]
Common Stock Issued [Member]
Previously Reported [Member]
Treasury Stock [Member]
Additional Paid in Capital [Member]
Additional Paid in Capital [Member]
Previously Reported [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/income for issuance of stock options 349       349      
Compensation expense (income) 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/income for issuance of stock options 161       161      
Compensation expense (income) 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/income for issuance of stock options 50       50      
Compensation expense (income) 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 $ 3 $ 2 $ (51) 325,516 $ 325,517 (324,832) 42
Balance (in shares) at Dec. 31, 2017   263,305 228,140 (1)        
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Compensation expense/income for issuance of stock options (40)       (40)      
Compensation expense (income) for issuance of restricted stock (81)       (81)      
Sale of common stock, net of expenses $ 4,210 $ 6     4,204      
Sale of common stock, net of expenses (in shares) 424,000 668,854            
Fair value of warrants issued $ (18,306)       (18,306)      
Net income (loss) 527           527  
Foreign currency translation (78)              
Total comprehensive loss (78)             (78)
Balance at Jun. 30, 2018 $ (13,090) $ 9   $ (51) $ 311,293   $ (324,305) $ (36)
Balance (in shares) at Jun. 30, 2018   932,159   (1)