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Property and Equipment, net
 12 Months Ended
Dec. 31, 2023
Property, Plant and Equipment [Abstract]  
Property and Equipment, net Property and Equipment, net
Property and equipment, net consisted of the following (in thousands):
December 31,
20232022
Computer software$903 $1,062 
Lab equipment(1)
11,392 10,260 
Office furniture267 267 
Leasehold improvements340 340 
Construction in progress13 13 
12,915 11,942 
Less: accumulated depreciation and amortization(2)
(6,151)(3,314)
$6,764 $8,628 
(1) Lab equipment includes failed sale lease-back assets of $3.4 million and $2.6 million, respectively, as of December 31, 2023 and 2022. Lab equipment includes finance lease ROU assets of $2.9 million as of December 31, 2023 and 2022.
(2) The accumulated amortization balance includes $0.9 million and $0.3 million, respectively, related to failed sale-leaseback assets as of December 31, 2023 and 2022. The accumulated amortization balance includes $1.7 million and $0.6 million, respectively, related to finance lease ROU assets as of December 31, 2023 and 2022.
Depreciation and amortization expense was $2.8 million and $1.9 million for the years ended December 31, 2023, and 2022, respectively.