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PROPERTY AND EQUIPMENT
 12 Months Ended
Dec. 31, 2021
Property, Plant and Equipment [Abstract]  
PROPERTY AND EQUIPMENT PROPERTY AND EQUIPMENT
The following table sets forth the composition of property and equipment, net as of December 31, 2021 and 2020 (in thousands):
December 31,
20212020
Lab equipment$569 $570 
Furniture and fixtures16 16 
Computer equipment99 97 
Software32 28 
Leasehold improvements293 293 
     Property and equipment, gross1,009 1,004 
     Less: accumulated depreciation(966)(881)
          Total Property and Equipment, Net$43 $123 
Depreciation expense was $0.1 million, $0.1 million and $0.2 million for the years ended December 31, 2021, 2020 and 2019, respectively.