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CONDENSED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
Total
Common Stock
Additional Paid-in Capital
Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2023   19,354,335    
Beginning balance at Dec. 31, 2023 $ 17,276,000 $ 19,000 $ 150,822,000 $ (133,565,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Stock-based compensation 600,000   600,000  
Stock option exercises, net of cashless exercises (in shares)   4,875    
Issuance of shares for vested restricted stock grants (in shares)   133,492    
Net loss (569,000)     (569,000)
Ending balance (in shares) at Jun. 30, 2024   19,492,702    
Ending balance at Jun. 30, 2024 17,307,000 $ 19,000 151,422,000 (134,134,000)
Beginning balance (in shares) at Mar. 31, 2024   19,404,561    
Beginning balance at Mar. 31, 2024 17,178,000 $ 19,000 151,166,000 (134,007,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Stock-based compensation 256,000   256,000  
Stock option exercises, net of cashless exercises (in shares)   4,875    
Issuance of shares for vested restricted stock grants (in shares)   83,266    
Net loss (127,000)     (127,000)
Ending balance (in shares) at Jun. 30, 2024   19,492,702    
Ending balance at Jun. 30, 2024 $ 17,307,000 $ 19,000 151,422,000 (134,134,000)
Beginning balance (in shares) at Dec. 31, 2024 19,782,311 19,782,311    
Beginning balance at Dec. 31, 2024 $ 17,747,000 $ 19,000 152,211,000 (134,483,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Stock-based compensation 381,000   381,000  
Stock option exercises, net of cashless exercises (in shares)   181,256    
Stock option exercises, net of cashless exercises 446,000 $ 1,000 445,000  
Issuance of shares for vested restricted stock grants (in shares)   62,276    
Net loss $ (569,000)     (569,000)
Ending balance (in shares) at Jun. 30, 2025 20,025,843 20,025,843    
Ending balance at Jun. 30, 2025 $ 18,005,000 $ 20,000 153,037,000 (135,052,000)
Beginning balance (in shares) at Mar. 31, 2025   19,816,043    
Beginning balance at Mar. 31, 2025 17,608,000 $ 19,000 152,390,000 (134,801,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Stock-based compensation 202,000   202,000  
Stock option exercises, net of cashless exercises (in shares)   181,256    
Stock option exercises, net of cashless exercises 446,000 $ 1,000 445,000  
Issuance of shares for vested restricted stock grants (in shares)   28,544    
Net loss $ (251,000)     (251,000)
Ending balance (in shares) at Jun. 30, 2025 20,025,843 20,025,843    
Ending balance at Jun. 30, 2025 $ 18,005,000 $ 20,000 $ 153,037,000 $ (135,052,000)