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Property and Equipment, Net
 3 Months Ended
Mar. 31, 2021
Property, Plant and Equipment [Abstract]  
Property and Equipment, Net Property and Equipment, Net
Property and equipment, net consisted of the following (in thousands):
March 31, 2021December 31, 2020
Lab equipment
$23,774 $23,491 
Office equipment
3,122 2,928 
Furniture and fixtures
1,350 1,340 
Leasehold improvements
10,374 10,629 
Assets under construction
11,332 14,321 
Less: accumulated depreciation
(16,409)(14,663)
Total property and equipment, net
$33,543 $38,046 
Depreciation expense for the three months ended March 31, 2021 and 2020 was $1.8 million and $1.3 million, respectively.