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Property, Equipment and Software
12 Months Ended
Dec. 31, 2019
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,
20192018
Computer equipment$2,430  $2,360  
Software7,513  7,011  
Furniture and office equipment713  668  
Motor Vehicles50  —  
Lab equipment38,368  36,062  
Leasehold improvements48,675  48,328  
Construction in progress187  218  
Property, equipment and software97,936  94,647  
Less accumulated depreciation and amortization(49,725) (37,935) 
Property, equipment and software, net$48,211  $56,712  

There was $0.1 million in property, equipment and software at December 31, 2019 that was purchased in 2019 but was not paid for by year end. The property, equipment and software balance at December 31, 2018 includes approximately $0.6 million in assets that were purchased in 2018 but were not paid for by year end. Depreciation and amortization expense related to property, equipment and software for the years ended December 31, 2019, 2018 and 2017 was $12.3 million, $9.2 million and $7.0 million, respectively.