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Condensed Consolidated Statements of Stockholders’ Equity (Unaudited) - USD ($)
$ in Thousands
Total
Series F Preferred Stock
Stock options
Assumed conversion of ESPP
Preferred Stock
Preferred Stock
Series F Preferred Stock
Common Stock
Common Stock
Series F Preferred Stock
Additional Paid in Capital
Additional Paid in Capital
Series F Preferred Stock
Additional Paid in Capital
Stock options
Additional Paid in Capital
Assumed conversion of ESPP
Accumulated Deficit
Accumulated Other Comprehensive Income
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     $ 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 - F-3 Preferred to Common (in shares)           (8,010)   1,779,998            
Conversion - F-3 Preferred to Common   $ 1           $ 18   $ (17)        
Net income (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
Beginning balance (in shares) at Dec. 31, 2024         14,192   33,061,002              
Beginning balance at Dec. 31, 2024 68,746       $ 0   $ 331   599,881       (531,548) 82
Increase (Decrease) in Stockholders' Equity [Roll Forward]                            
Compensation expense     $ 6,813 $ 50             $ 6,813 $ 50    
Issuance of common stock with the Employee Stock Purchase Plan (in shares)             35,513              
Issuance of common stock with the Employee Stock Purchase Plan $ 238               238          
Warrant Exercise - Series F (in shares)           0   238,500            
Warrant Exercise - Series F   $ 2,385           $ 2   $ 2,383        
Stock Option Exercise (in shares) 101,597           101,597              
Stock Option Exercise $ 630           $ 1   629          
Net income (loss) 1,069                       1,069  
Unrealized gain on investments 239                         239
Foreign currency translation adjustments 60                         60
Ending balance (in shares) at Mar. 31, 2025         14,192   33,436,612              
Ending balance at Mar. 31, 2025 $ 80,230       $ 0   $ 334   $ 609,994       $ (530,479) $ 381