6. Leases

The Company has entered into operating leases primarily for commercial buildings. These leases have terms that range from 3 years to 11 years, some of which include options to extend the leases for up to 5 years. Rent expense, including short-term lease cost, was $1,073 and $972 for the three months ended March 31, 2024 and 2023, respectively.

In July 2023, the Company entered into an Assignment and Assumption of Lease Agreement in which a third party (Assignee) assumed the rights, title, and interest in the lease, including assumption of lease payments. Notwithstanding the Assignee's assumption of lease payments, Inogen remains the primary obligor under the lease to the landlord. Lease payments assumed by the Assignee are: