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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 presents the composition of property and equipment, net (in thousands):
As of December 31,
20212020
Lab equipment
$12,995 $8,994 
Computer hardware, software and telephone
148 140 
Furniture and fixtures
221 107 
Leasehold improvements
105 67 
Construction in progress
681 1,042 
14,150 10,350 
Less accumulated depreciation
(3,920)(2,126)
Property and equipment, net
$10,230 $8,224 
Depreciation expense was $1.8 million and $0.5 million for the years ended December 31, 2021 and 2020, respectively.