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Property and Equipment, net
 12 Months Ended
Dec. 31, 2023
Property, Plant and Equipment [Abstract]  
Property and Equipment, net
Note 8. Property and Equipment, net
Property and equipment, net consists of the following (in thousands):
December 31,
20232022
Office equipment$23,417 $22,734 
Laboratory equipment220,677 192,141 
Computer equipment147,570 92,115 
Land10,931 10,429 
Building and leasehold improvements584,755 564,170 
Operating lease right-of-use assets20,553 23,311 
Construction in progress13,544 47,224 
1,021,447 952,124 
Less accumulated depreciation and amortization(269,934)(212,814)
Property and equipment, net$751,513 $739,310 
Depreciation expense, including amortization expense of leasehold improvements, was $60.1 million, $46.3 million and $36.3 million for the years ended December 31, 2023, 2022 and 2021, respectively.
We are the lessee of several contracts, including those to secure fleet vehicles, buildings and equipment. Our lease agreements do not contain any material residual value guarantees or restrictive covenants. Some of our building leases include options to renew and the exercise of these options is at our discretion.
Our current operating lease liabilities are reflected in accrued and other current liabilities and our noncurrent operating lease liabilities are reflected in other liabilities on the consolidated balance sheets and are as follows (in thousands):
December 31,
20232022
Current
Operating lease liabilities$5,686$8,195
Finance lease liabilities3,4393,179
Noncurrent
Operating lease liabilities14,28414,109
Finance lease liabilities29,16230,083
Total lease liabilities$52,571$55,566
The maturity of our lease liabilities are as follows (in thousands):
OperatingFinance
2024$6,506$4,641
20253,4134,280
20262,8933,829
20272,9033,139
20282,3782,856
After 20284,55120,809
Total lease cash payments$22,644$39,554
Less: discount 2,6746,953
Present value of lease liabilities$19,970$32,601
The cash paid for amounts included in the measurement of our operating lease liabilities for the years ended December 31, 2023, 2022 and 2021 was $9.4 million, $11.8 million and $14.3 million, respectively, in operating cash flows. The cash paid for amounts included in the measurement of our finance lease liabilities for the years ended December 31, 2023, 2022 and 2021 was $3.4 million, $2.9 million and $2.4 million respectively, in financing cash flows.
As of December 31, 2023, our finance and operating leases had a weighted average lease term of approximately 10.8 years and 5.8 years, respectively. The discount rate of our leases is an approximation of an estimated incremental borrowing rate and is dependent upon the term and economics of each agreement. The weighted average discount rate of our finance and operating leases was approximately 4.0% and 3.9%, respectively.
As of December 31, 2022, our finance and operating leases had a weighted average lease term of approximately 12.0 years and 5.5 years, respectively. The weighted average discount rate of our finance and operating leases was approximately 4.2% and 4.4%, respectively.
As of December 31, 2021, our finance and operating leases had a weighted average lease term of approximately 13.4 years and 4.9 years, respectively. The weighted average discount rate of our finance and operating leases was approximately 4.1% and 4.8%, respectively.
For the year ended December 31, 2023, we incurred approximately $9.8 million of expense related to our operating leases, approximately $3.5 million of amortization on our finance lease right-of-use assets and approximately $1.3 million of interest expense on our finance lease liabilities. For the year ended December 31, 2022, we incurred approximately $11.7 million of expense related to our operating leases, approximately $3.1 million of amortization on our finance lease right-of-use assets and approximately $1.4 million of interest expense on our finance lease liabilities. For the year ended December 31, 2021, we incurred approximately $14.2 million of expense related to our operating leases, approximately $2.7 million of amortization on our finance lease right-of-use assets and approximately $1.3 million of interest expense on our finance lease liabilities.