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Property and Equipment
 9 Months Ended
Sep. 30, 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 September 30,
2021		As of December 31,
2020
Lab equipment$12,819 $8,994 
Computer hardware, software and telephone148 140 
Furniture and fixtures221 107 
Leasehold improvements104 67 
Construction in progress862 1,042 
14,154 10,350 
Less accumulated depreciation(3,313)(2,126)
Property and equipment, net$10,841 $8,224 

Depreciation expense was $0.1 million and $0.1 million for the three months ended September 30, 2021 and 2020, respectively, and $1.2 million and $0.2 million for the nine months ended September 30, 2021 and 2020, respectively.