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Condensed Consolidated Statements of Stockholders' Equity (Deficit) (Unaudited) - USD ($)
$ in Thousands
Total
Stock options
Employee Stock
Preferred F-3 Stock
Preferred Stock
Preferred Stock
Preferred F-3 Stock
Common Stock
Common Stock
Preferred F-3 Stock
Additional Paid in Capital
Additional Paid in Capital
Stock options
Additional Paid in Capital
Employee Stock
Additional Paid in Capital
Preferred F-3 Stock
Accumulated Deficit
Accumulated Other Comprehensive Income (Loss)
Beginning Balance (in shares) at Dec. 31, 2022         11,357   10,046,571              
Beginning Balance at Dec. 31, 2022 $ (5,859)       $ 0   $ 100   $ 451,607       $ (457,483) $ (83)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                            
Compensation expense for issuance of stock options   $ 1,661               $ 1,661        
Private placement -issuance of common shares, net of expenses (in shares)             19,646              
Private placement -issuance of common shares, net of expenses 56           $ 1   55          
Issuance of common stock with the employee stock purchase plan (in shares)             15,417              
Issuance of common stock with the employee stock purchase plan 47               47          
Net loss (9,000)                       (9,000)  
Foreign currency translation adjustments 19                         19
Ending Balance (in shares) at Mar. 31, 2023         11,357   10,081,634              
Ending Balance at Mar. 31, 2023 (13,076)       $ 0   $ 101   453,370       (466,483) (64)
Beginning Balance (in shares) at Dec. 31, 2023         24,819   22,761,554              
Beginning Balance at Dec. 31, 2023 15,777       $ 0   $ 228   520,576       (505,162) 135
Increase (Decrease) in Stockholders' Equity [Roll Forward]                            
Compensation expense for issuance of stock options   $ 2,895 $ 50             $ 2,895 $ 50      
Private placement -issuance of common shares, net of expenses (in shares)             876,627              
Private placement -issuance of common shares, net of expenses 6,912           $ 8   6,904          
Issuance of common stock with the employee stock purchase plan (in shares)             21,140              
Issuance of common stock with the employee stock purchase plan 74               74          
Conversion of shares (in shares)           (8,010)   1,779,998            
Conversion of shares       $ 1       $ 18       $ (17)    
Net loss (11,111)                       (11,111)  
Unrealized gain on investments 8                         8
Foreign currency translation adjustments 14                         14
Ending Balance (in shares) at Mar. 31, 2024         16,809   25,439,319              
Ending Balance at Mar. 31, 2024 $ 14,620       $ 0   $ 254   $ 530,482       $ (516,273) $ 157