Consolidated Statements of Stockholders' Deficit - USD ($)
shares in Thousands, $ in Thousands
Total
Preferred Stock [Member]
Common Stock [Member]
Additional Paid-In Capital [Member]
Accumulated Other Comprehensive Loss [Member]
Accumulated Deficit [Member]
Beginning Balance at Dec. 31, 2017 $ (2,335)   $ 1 $ 7,578 $ (128) $ (9,786)
Beginning Balance, shares at Dec. 31, 2017   4,408 5,781      
Exchange of shares in connection with reverse merger 6,183 $ 1 $ 1 6,181    
Exchange of shares in connection with reverse merger, shares   (3,645) (3,994)      
Sale of common and preferred stock 5,335   $ 1 5,334    
Debt exchange 13,694   $ 3 13,691    
Debt exchange, shares     3,400      
Cashless warrant exercises, shares     81      
Exercise of Unitron option     $ 1 (1)    
Exercise of Unitron option, shares     625      
Issuance of warrants and beneficial conversion feature with convertible debt 2,060     2,060    
Conversions of preferred to common stock   $ (1) $ 1      
Conversion of preferred stock to common stock, shares   (739) 739      
Stock-based compensation expense 460     460    
Stock-based compensation expense, shares     101      
Sale of common and preferred stock, shares   298 1,060      
Foreign currency translation (883)       (883)  
Net loss (27,271)         (27,271)
Ending Balance at Dec. 31, 2018 (2,757)   $ 8 35,303 (1,011) (37,057)
Ending Balance, shares at Dec. 31, 2018   322 7,793      
Debt exchange 8,637   $ 17 8,620    
Debt exchange, shares     16,800      
Warrant exercises 1,154     1,154    
Warrant exercises     382      
Issuance of warrants and beneficial conversion feature with convertible debt 750     750    
Conversion of preferred stock to common stock, shares   (297) 297      
Stock-based compensation expense 3,266   $ 19 3,247    
Stock-based compensation expense, shares     18,505      
Foreign currency translation (58)       (58)  
Net loss (21,016)         (21,016)
Ending Balance at Dec. 31, 2019 $ (10,024)   $ 44 $ 49,074 $ (1,069) $ (58,073)
Ending Balance, shares at Dec. 31, 2019   25 43,777