SHARE-BASED PAYMENTS - Share Compensation Expense (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
General and administrative expenses
SHARE-BASED PAYMENTS
Share based compensation expense	$ 0.5	$ 0.4	$ 1.0	$ 1.1
Research and development expenses
SHARE-BASED PAYMENTS
Share based compensation expense	$ 0.7	$ 0.6	$ 1.6	$ 1.3