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INCOME TAXES - Tax reconciliation (Details) - USD ($)
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
INCOME TAXES    
Federal income tax expense at statutory rate 21.00% 21.00%
State income tax, net of federal benefit 10.40% 14.40%
Permanent differences 1.60% (0.50%)
Research and development tax credit   0.30%
Change in valuation allowance (33.00%) (35.20%)
Effective income tax rate 0.00% 0.00%
Unrecognized tax benefits $ 0 $ 0