PROPERTY AND EQUIPMENT, NET - Schedule of Property and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 5,301	$ 4,677
Less: Accumulated depreciation	(4,497)	(3,933)
Property and equipment, net	804	744
Furniture and office equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	1,808	1,712
Laboratory equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	20	20
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	2,945	2,945
Construction in progress
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 528	$ 0