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INCOME TAXES - Deferred tax assets (Details) - USD ($)
Dec. 31, 2025
Dec. 31, 2024
Deferred tax assets    
Federal net operating loss $ 61,791,000 $ 47,909,000
Federal research and development tax credit carryforwards 22,530,000 21,359,000
State net operating losses and tax credit carryforwards 14,935,000 10,191,000
Capitalized research and development expenses 9,632,000 22,658,000
Stock-based compensation expense 5,092,000 5,072,000
Other 457,000 419,000
Total deferred tax assets 114,437,000 107,608,000
Deferred tax liabilities    
Depreciable assets (98,000) (123,000)
Total deferred tax liabilities (98,000) (123,000)
Net deferred tax assets 114,339,000 107,485,000
Less- valuation allowance $ (114,339,000) $ (107,485,000)