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INCOME TAXES, Reconciliation of Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
INCOME TAXES [Abstract]      
Benefit at U.S. Federal statutory rate $ (5,930) $ (13,840) $ (15,046)
State taxes - deferred (763) (1,773) (252)
Increase in valuation allowance 4,696 15,117 14,619
Research and development credits 0 (211) (240)
Decrease in federal net operating loss 0 0 624
162(m) disallowance 1,183 862 64
Other 814 (155) 231
Benefit for income taxes $ 0 $ 0 $ 0