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Leases
 12 Months Ended
Dec. 31, 2023
Leases [Abstract]  
Leases Leases
The Company currently has operating leases for office and research laboratory space, equipment, and vehicles under agreements expiring at various dates through 2034, which include renewal options on leases which the Company is reasonably certain to exercise.
For the years ended December 31, 2023 and 2022, operating lease expense was $9.5 million and $9.8 million and variable lease expense was $2.1 million and $1.7 million, respectively. For the years ended December 31, 2023 and 2022, the Company paid $9.5 million and $8.3 million, respectively, for amounts included in the measurement of operating lease liabilities and recorded right-of-use assets of $0.6 million and $8.9 million, respectively.
Commitments under finance leases are not significant for the year ended December 31, 2023.
Supplemental balance sheet information related to operating leases were as follows:
(in thousands, except year and discount rate amounts)December 31, 2023December 31, 2022
Operating lease ROU assets, net$26,312 $29,534 
Current portion of the operating lease liabilities$8,324 $8,552 
Non-current portion of the operating lease liabilities48,877 51,578 
Total operating lease liability$57,201 $60,130 
Weighted-average remaining lease terms (years)9.417.0
Weighted-average discount rate9.7 %12.2 %
At December 31, 2023, the future minimum operating lease payments were as follows:
(in thousands)Operating Lease
2024$9,236 
20259,157 
20269,213 
20279,351 
20289,144 
Thereafter43,715 
Total lease payments89,816 
Less lease incentives(22,299)
Less imputed interest(10,316)
Total operating lease liability$57,201