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Property, Equipment and Leasehold Improvements
 12 Months Ended
Dec. 31, 2021
Property, Plant and Equipment [Abstract]  
Property, Equipment and Leasehold Improvements Property, Equipment and Leasehold Improvements
Property, equipment and leasehold improvements consist of the following:
December 31,
(dollars in millions)20212020
Laboratory equipment$13.6 $11.1 
Office equipment1.4 1.2 
Leasehold improvements8.4 6.1 
Total property, equipment and leasehold improvements23.4 18.4 
Less: accumulated depreciation(10.8)(6.1)
Property, equipment and leasehold improvements, net$12.7 $12.3 
Depreciation expense totaled $4.8 million, $3.2 million, and $1.6 million for the years ended December 31, 2021, 2020, and 2019, respectively.