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Property and Equipment
 3 Months Ended
Mar. 31, 2022
Property, Plant and Equipment [Abstract]  
Property and Equipment Property and Equipment
The following table presents the composition of property and equipment, net (in thousands):

As of March 31,
2022		As of December 31,
2021
Lab equipment$13,045 $12,995 
Computer hardware, software and telephone148 148 
Furniture and fixtures221 221 
Leasehold improvements104 105 
Construction in progress700 681 
14,218 14,150 
Less accumulated depreciation(4,521)(3,920)
Property and equipment, net$9,697 $10,230 

Depreciation expense was $0.6 million and $0.5 million for the three months ended March 31, 2022 and 2021, respectively.