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Property and Equipment, Net
 9 Months Ended
Sep. 30, 2020
Property, Plant and Equipment [Abstract]  
Property and Equipment, Net Property and Equipment, Net
Property and equipment, net consisted of the following (in thousands):
September 30, 2020December 31, 2019
Lab equipment
$21,191 $18,214 
Office equipment
2,505 2,211 
Furniture and fixtures
1,267 1,301 
Leasehold improvements
10,048 10,316 
Assets under construction
10,004 4,687 
Less: accumulated depreciation
(12,260)(8,565)
Total property and equipment, net
$32,755 $28,164 
Depreciation expense for the three months ended September 30, 2020 and 2019 was $1.5 million and $1.1 million, respectively, and for the nine months ended September 30, 2020 and 2019 was $4.0 million and $3.3 million, respectively.