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Consolidated Statements of Shareholders' Equity - USD ($)
$ in Thousands
Total
Common stock and paid-in capital
Accumulated other comprehensive loss
Accumulated deficit
Balance at Dec. 31, 2018   $ 57,857 $ (181) $ (5,475)
Issuance of common stock      
Issuance of warrants and senior convertible notes   440    
Share-based compensation expense   217    
Proceeds from employee stock purchase plan   23    
Unrealized gain on available-for-sale securities, net of tax     68  
Foreign currency translation adjustment $ (63)   (63)  
Net income (loss) (8,408)     (8,408)
Balance at Dec. 31, 2019 44,478 58,537 (176) (13,883)
Issuance of common stock   4,764    
Issuance of warrants and senior convertible notes      
Share-based compensation expense   63    
Proceeds from employee stock purchase plan   14    
Unrealized gain on available-for-sale securities, net of tax     8  
Foreign currency translation adjustment (18)   (18)  
Net income (loss) 505     505
Balance at Dec. 31, 2020 $ 49,814 $ 63,378 $ (186) $ (13,378)