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INCOME TAXES - Statutory income tax rate (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Income tax benefits computed using the federal statutory income tax rate    
Statutory rate (21.00%) (21.00%)
State taxes, net of benefit (5.10%) (4.70%)
Permanent differences:    
Permanent differences 0.10% 0.40%
Research and development tax credit (0.70%) (0.90%)
Stock-based compensation 0.90% 0.20%
Other (0.10%)  
Increase in valuation reserve 25.90% 26.00%
Effective tax rate 0.00% 0.00%
Capitalized research expenses $ 1,226