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INCOME TAXES - Deferred tax assets (Details) - USD ($) | Dec. 31, 2025 | Dec. 31, 2024
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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)

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