SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Going Concern, Liquidity, and Capital Reserves (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Accounting Policies [Abstract]
Net loss	$ 17,390	$ 7,515
Working capital, amount	11,700
Accumulated deficit	81,052		$ 63,662
Net cash used in operating activities	$ 7,696	$ 7,608