5. Leases

The Company has entered into operating leases primarily for commercial buildings. These leases have terms which range from 2 years to 11 years, some of which include options to extend the leases for up to 5 years. There are no economic penalties for the Company to extend the lease, and it is not reasonably assured that the Company will exercise the extension options. Operating lease right-of-use assets and liabilities commencing after January 1, 2019 are recognized at commencement date based on the present value of lease payments over the lease term. The operating leases do not contain material residual value guarantees or material restrictive covenants.

Rent expense, including short-term lease cost, was $987 and $751 for the three months ended March 31, 2021 and March 31, 2020, respectively.

Information related to the Company's right-of-use assets and related operating lease liabilities were as follows:

As of March 31, 2021, the Company has additional operating leases for its corporate headquarters in California that has not yet commenced, with total minimum lease payments of $11,359. Lease payments for its corporate headquarters will increase annually by the lesser of the change, if any, in the Consumer Price Index of the Bureau of Labor Statistics of the U.S. Department of Labor or three and one-half percent (3.5%) at each annual adjustment date thereafter. The operating lease for its corporate headquarters is estimated to commence in the second quarter of 2021 with a lease term of approximately 10 years. The table above excludes lease payments that were not fixed at commencement or modification.