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Property, Equipment and Leasehold Improvements
 6 Months Ended
Jun. 30, 2022
Property, Plant and Equipment [Abstract]  
Property, Equipment and Leasehold Improvements Property, Equipment and Leasehold Improvements
Property, equipment and leasehold improvements consist of the following at:
(dollars in millions)June 30,
2022		December 31,
2021
Laboratory equipment$15.8 $13.6 
Leasehold improvements10.0 8.4 
Office equipment1.5 1.4 
Total property, equipment and leasehold improvements27.3 23.4 
Less: accumulated depreciation and amortization(13.7)(10.7)
Property, equipment and leasehold improvements, net$13.6 $12.7 
Depreciation and amortization expense totaled $1.5 million and $1.2 million for the three months ended June 30, 2022 and 2021, respectively, and $3.0 million and $2.3 million for the six months ended June 30, 2022 and 2021, respectively.