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Property, Equipment and Software
 12 Months Ended
Dec. 31, 2021
Property, Plant and Equipment [Abstract]  
Property, Equipment and Software Property, Equipment and Software
Property, equipment and software consists of the following (in thousands):
December 31,
20212020
Computer equipment$2,890 $2,663 
Software9,453 8,242 
Furniture and office equipment713 713 
Motor vehicles50 50 
Lab equipment45,693 41,202 
Leasehold improvements51,056 48,884 
Construction in progress630 2,022 
Property, equipment and software110,485 103,776 
Less accumulated depreciation and amortization(72,809)(61,551)
Property, equipment and software, net$37,676 $42,225 

Depreciation and amortization expense related to property, equipment and software for the years ended December 31, 2021, 2020 and 2019 was $11.3 million, $12.0 million and $12.3 million, respectively.