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PROPERTY AND EQUIPMENT - Summary of Property and Equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Property, Plant and Equipment [Line Items]                
Property, plant and equipment, gross $ 3,747       $ 3,380      
Less accumulated depreciation and amortization (3,190)       (3,158)      
Total 557 $ 580 $ 297 $ 270 222 $ 173 $ 201 $ 239
Laboratory equipment                
Property, Plant and Equipment [Line Items]                
Property, plant and equipment, gross 2,817       2,415      
Leasehold improvements                
Property, Plant and Equipment [Line Items]                
Property, plant and equipment, gross 425       425      
Computer hardware and software                
Property, Plant and Equipment [Line Items]                
Property, plant and equipment, gross 327       305      
Office equipment                
Property, Plant and Equipment [Line Items]                
Property, plant and equipment, gross 36       93      
Furniture and fixtures                
Property, Plant and Equipment [Line Items]                
Property, plant and equipment, gross $ 142       $ 142