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Property, Equipment and Leasehold Improvements
 3 Months Ended
Mar. 31, 2023
Property, Plant and Equipment [Abstract]  
Property, Equipment and Leasehold Improvements Property, Equipment and Leasehold Improvements
Property, equipment and leasehold improvements consist of the following:
(dollars in millions)March 31,
2023		December 31,
2022
Laboratory equipment$17.4 $17.1 
Leasehold improvements11.4 10.9 
Office equipment2.2 2.0 
Total property, equipment and leasehold improvements31.0 30.0 
Less: accumulated depreciation and amortization(17.6)(16.6)
Property, equipment and leasehold improvements, net$13.4 $13.4 
Depreciation and amortization expense totaled $1.2 million and $1.5 million for the three months ended March 31, 2023 and 2022, respectively