Future minimum lease payments, excluding Lease Operating Costs, as of June 30, 2021 are as follows (in thousands):

2021	$	108
2022		181
2023		166
Thereafter		-
Total future minimum lease payments		455
Less: discount		36
Total lease liabilities	$	419

Lease expense under current leases was approximately $0.1 million and $0.2 million for the three and six months ended June 30, 2021, respectively. Lease expense under former leases was approximately $0.7 million and $1.4 million for the three and six months ended June 30, 2020, respectively. Cash paid for amounts included in the measurement of lease liabilities was $51,000 and $0.1 million for the three and six months ended June 30, 2021, respectively. Cash paid for amounts included in the measurement of lease liabilities was $1.0 and $1.9 million for the three and six months ended June 30, 2020, respectively. As of June 30, 2021, the weighted-average remaining lease term and the weighted-average discount rate for the Company’s only operating lease, the Waltham Sublease, was 2.3 years and 3.5%, respectively.

In December 2020, the Company entered into a sublease agreement for office space in Waltham, Massachusetts (the “Waltham Sublease”). The Waltham Sublease commenced on December 21, 2020 and expires on November 30, 2023. In addition to rent of approximately $15,000 per month, the Waltham Sublease requires the Company to pay certain taxes, insurance and operating costs relating to the leased premises (collectively, “Lease Operating Costs”). The Waltham Sublease contains customary default provisions, representations, warranties and covenants. The Waltham Sublease is classified as an operating lease. The Company recognizes the Waltham Sublease expense in the consolidated statements of operations and records a lease liability and right-of-use asset for this lease.

In September 2020, the Company entered into a sublease agreement for office space in San Diego, California with an entity of which the Chairman of the Company’s board of directors is also the chairman and chief executive officer (the “San Diego Sublease”). The San Diego Sublease term is approximately 7 years, and the rent is approximately $12,000 per month. The San Diego Sublease is cancellable without penalty by either party with 30-days’ written notice. The San Diego Sublease is a short-term lease for accounting purposes. The Company made payments of approximately $28,000 and $67,000 under the San Diego Sublease during the three and six months ended June 30, 2021. The Company recognizes the San Diego Sublease payments in the consolidated statements of operations and does not record a lease liability or right-of-use asset for this lease.

From time to time, the Company may become subject to claims and litigation arising in the ordinary course of business. The Company is not a party to any material legal proceedings, nor is it aware of any material pending or threatened litigation.