STOCKHOLDERS’ DEFICIT - At-The-Market Equity Sales Agreement (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	May 31, 2021
Class of Stock [Line Items]
Net proceeds	$ 13.6
At-The-Market Equity Sales Agreement
Class of Stock [Line Items]
Aggregate offering price (of up)				$ 50.0
Commission percentage				3.00%
Sale of stock (in shares)	0	0	200,000
Net proceeds		$ 10.9