We have operating lease agreements for laboratory, office and warehouse facilities in Seattle, Washington, Bothell, Washington, South San Francisco, California and New York City, New York. As of September 30, 2023, we were not party to any finance leases.

The following table reconciles our undiscounted operating lease cash flows to our operating lease liabilities, less current portion balance as of September 30, 2023 (in thousands):


2023 (excluding the nine months ended September 30, 2023)	$	3,678
2024		13,692
2025		14,098
2026		12,330
2027		11,944
Thereafter		69,244
Total undiscounted lease payments		124,986
Less: Imputed interest rate		(23,680	)
Total operating lease liabilities		101,306
Less: Current portion		(9,482	)
Operating lease liabilities, less current portion	$	91,824

During the nine months ended September 30, 2023, cash paid for amounts included in the measurement of lease liabilities was $10.3 million. During the nine months ended September 30, 2022, cash paid for amounts included in the measurement of lease liabilities was $6.9 million, net of $4.0 million of cash received for tenant improvement allowances.

We have $2.1 million in letters of credit with one of our financial institutions in connection with certain of our leases.