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CONSOLIDATED CONDENSED STATEMENTS OF STOCKHOLDERS' EQUITY (DEFICIT) (UNAUDITED) - USD ($)
$ in Thousands
Total
Series C Convertible Preferred Stock [Member]
Convertible Preferred Stock [Member]
Convertible Preferred Stock [Member]
Series B Convertible Preferred Stock [Member]
Convertible Preferred Stock [Member]
Series C Convertible Preferred Stock [Member]
Convertible Preferred Stock [Member]
Series B And C Convertible Preferred Stock [Member]
Common Stock [Member]
Common Stock [Member]
Series B Convertible Preferred Stock [Member]
Common Stock [Member]
Series C Convertible Preferred Stock [Member]
Common Stock [Member]
Series B And C Convertible Preferred Stock [Member]
Additional Paid-in Capital [Member]
Additional Paid-in Capital [Member]
Series C Convertible Preferred Stock [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Deficit [Member]
Balance at Dec. 31, 2017 $ 13,000                   $ 413,362   $ 1,387 $ (401,749)
Balance (in shares) at Dec. 31, 2017     2,431       115,652              
Share-based compensation 143                   143      
Sale of common stock, net 27                   27      
Sale of common stock, net (in shares)             202              
Conversion of Convertible Preferred Stock into common stock (share)       (1,228)       7,375            
Foreign currency translation adjustment and accumulated other comprehensive income (281)                       (281)  
Net loss (4,409)                         (4,409)
Balance at Mar. 31, 2018 8,480                   413,532   1,106 (406,158)
Balance (in shares) at Mar. 31, 2018     1,203       123,229              
Balance at Dec. 31, 2017 13,000                   413,362   1,387 (401,749)
Balance (in shares) at Dec. 31, 2017     2,431       115,652              
Net loss (10,398)                          
Balance at Sep. 30, 2018 6,138                   417,103   1,182 (412,147)
Balance (in shares) at Sep. 30, 2018     4,624       233,826              
Balance at Mar. 31, 2018 8,480                   413,532   1,106 (406,158)
Balance (in shares) at Mar. 31, 2018     1,203       123,229              
Share-based compensation 96                   96      
Sale of common stock, net (297)                   (297)      
Sale of common stock, net (in shares)             192              
Conversion of Convertible Preferred Stock into common stock (share)       (17)       103            
Foreign currency translation adjustment and accumulated other comprehensive income 131                       131  
Net loss (3,659)                         (3,659)
Balance at Jun. 30, 2018 4,751                   413,331   1,237 (409,817)
Balance (in shares) at Jun. 30, 2018     1,186       123,524              
Share-based compensation 86                   86      
Sale of common stock, net 3,686                   3,686      
Sale of common stock, net (in shares)     6,723       29,407              
Conversion of Convertible Preferred Stock into common stock (share)           (3,285)       80,895        
Foreign currency translation adjustment and accumulated other comprehensive income (55)                       (55)  
Beneficial conversion feature related to Series C Convertible Preferred Stock   $ 2,487                   $ 2,487    
Accretion of beneficial conversion feature related to Series C Convertible Preferred Stock   (2,487)                   (2,487)    
Net loss (2,330)                         (2,330)
Balance at Sep. 30, 2018 6,138                   417,103   1,182 (412,147)
Balance (in shares) at Sep. 30, 2018     4,624       233,826              
Balance at Dec. 31, 2018 $ 5,225                   418,390   1,218 (414,383)
Balance (in shares) at Dec. 31, 2018 296,609   4,606       296,609              
Share-based compensation $ 49                   49      
Sale of common stock, net 1,873                   1,873      
Sale of common stock, net (in shares)             139,855              
Conversion of Convertible Preferred Stock into common stock (share)         (66)       1,653          
Foreign currency translation adjustment and accumulated other comprehensive income (140)                       (140)  
Net loss (3,150)                         (3,150)
Balance at Mar. 31, 2019 3,857                   420,312   1,078 (417,533)
Balance (in shares) at Mar. 31, 2019     4,540       438,117              
Balance at Dec. 31, 2018 $ 5,225                   418,390   1,218 (414,383)
Balance (in shares) at Dec. 31, 2018 296,609   4,606       296,609              
Exercise of warrants             1,672,000              
Net loss $ (11,771)                          
Balance at Sep. 30, 2019 $ 160           $ 3       426,311     (426,154)
Balance (in shares) at Sep. 30, 2019 2,841,588   1,959       2,841,588              
Balance at Mar. 31, 2019 $ 3,857                   420,312   1,078 (417,533)
Balance (in shares) at Mar. 31, 2019     4,540       438,117              
Share-based compensation 28                   28      
Sale of common stock, net 64                   64      
Sale of common stock, net (in shares)             5,000              
Foreign currency translation adjustment and accumulated other comprehensive income (1,078)                       $ (1,078)  
Net loss (9,147)                         (9,147)
Balance at Jun. 30, 2019 (6,276)                   420,404     (426,680)
Balance (in shares) at Jun. 30, 2019     4,540       443,117              
Share-based compensation 29                   29      
Sale of common stock and pre-funded warrants, net of offering costs $ 4,597           $ 3       $ 4,594      
Sale of common stock and pre-funded warrants, net of offering costs (in shares)             2,000,510              
Conversion of Convertible Preferred Stock into common stock (share)           (2,581)       332,546        
Exercise of warrants 490                   490      
Exercise of warrants (in shares)             65,415              
Warrant derivative liability reclasssified to equity due to exercise of warrants $ 794                   $ 794      
Beneficial conversion feature related to Series C Convertible Preferred Stock   554                   554    
Accretion of beneficial conversion feature related to Series C Convertible Preferred Stock   $ (554)                   $ (554)    
Net loss 526                         526
Balance at Sep. 30, 2019 $ 160           $ 3       $ 426,311     $ (426,154)
Balance (in shares) at Sep. 30, 2019 2,841,588   1,959       2,841,588