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Property and Equipment
 12 Months Ended
Dec. 31, 2022
Property, Plant and Equipment [Abstract]  
Property and Equipment Property and Equipment
Property and equipment, net of accumulated depreciation consisted of the following (in thousands):
 December 31,
 20222021
Lab equipment$2,299 $2,341 
Leasehold improvements1,713 1,713 
Computer equipment817 817 
Office furniture and equipment520 520 
     Property and equipment5,349 5,391 
     Less accumulated depreciation(5,122)(5,138)
          Property and equipment, net of accumulated depreciation$227 $253