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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Preferred Stock
Common Stock
Cumulative Effect, Period of Adoption, Adjustment
Common Stock
Additional Paid-in Capital
Additional Paid-in Capital
Preferred Stock
Accumulated Other Comprehensive Loss
Accumulated Deficit
Accumulated Deficit
Cumulative Effect, Period of Adoption, Adjustment
Preferred Stock
Preferred Stock
Preferred Stock
Preferred Stock
Common Stock
Beginning balance (in shares) at Dec. 31, 2018         2,418,000           0    
Beginning balance at Dec. 31, 2018 $ 11,052     $ (186) $ 0 $ 128,368   $ (1) $ (117,315) $ (186) $ 0    
Increase (Decrease) in Stockholders' Equity [Roll Forward]                          
Issuance of common stock under employee stock option and stock purchase plans (in shares)         78,000                
Issuance of common stock under employee stock option and stock purchase plans 5         5              
Common stock withheld in lieu of income tax withholding from share-based compensation (in shares)         (10,000)                
Common stock withheld in lieu of income tax withholding from share-based compensation (116)         (116)              
Stock-based compensation 616         616              
Foreign currency translation adjustment (2)             (2)          
Net loss (7,373)               (7,373)        
Ending balance at Dec. 31, 2019 3,996       $ 0 128,873   (3) (124,874)   $ 0    
Ending balance (in shares) at Dec. 31, 2019         2,486,000           0    
Increase (Decrease) in Stockholders' Equity [Roll Forward]                          
Issuance of common stock under employee stock option and stock purchase plans (in shares)         60,000                
Issuance of common stock under employee stock option and stock purchase plans 100         100              
Common stock withheld in lieu of income tax withholding from share-based compensation (3)         (3)              
Stock-based compensation 131         131              
Foreign currency translation adjustment 0                        
Net loss (5,981)               (5,981)        
Issuance of common stock and warrants (in shares)         688,000                
Issuance of common stock and warrants 2,749         2,749              
Offering costs on issuance of common stock and warrants (510)         (510)              
Issuance of common stock upon the exercise of warrants         269,000                
Issuance of common stock upon the exercise of warrants 2,235         2,235              
Warrant liability - issuance (1,636)         (1,636)              
Warrant liability - modification 1,405         1,405              
Conversion of convertible securities     22,000   22,310           111,548 2,709,000 112,000
Conversion of notes to preferred stock   $ 1,769         $ 1,769            
Ending balance at Dec. 31, 2020 $ 4,255       $ 0 $ 135,113   $ (3) $ (130,855)   $ 0    
Ending balance (in shares) at Dec. 31, 2020         3,525,000           2,597,000