STOCK-BASED COMPENSATION - Schedule of stock-based compensation expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Stock-Based Compensation (Details) [Line Items]
Total stock-based compensation expense	$ 90	$ 88	$ 181	$ 173
Research and development
Stock-Based Compensation (Details) [Line Items]
Total stock-based compensation expense	3	4	6	8
Selling, general and administrative
Stock-Based Compensation (Details) [Line Items]
Total stock-based compensation expense	$ 87	$ 84	$ 175	$ 165