SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Change in accrued liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Beginning balance	$ 634	$ 238
Accruals	790	692
Reversal from settlement	(168)
Cash payments	(870)	(296)
Ending balance	386	634
Current	386	349
Noncurrent		285
Total severance liability	$ 386	$ 634