Commitments and Contingencies

12 Months Ended

Dec. 31, 2023

Commitments and Contingencies Disclosure [Abstract]

Leases

The Company leases its facilities under long-term operating leases that expire at various dates through 2026. The Company generally has options to renew lease terms on its facilities, which may be exercised at the Company’s sole discretion. In addition, certain lease arrangements may be terminated prior to their original expiration date at the Company’s discretion. The Company evaluates renewal and termination options at the lease commencement date to determine if it is reasonably certain to exercise the option and has concluded on all operating leases that it is not reasonably certain that any options will be exercised. The weighted-average remaining lease term for the Company’s operating leases as of December 31, 2023 was 2.58 years.

Expense related to leases is recorded on a straight-line basis over the lease term. Lease expense under operating leases, including common area maintenance fees, totaled approximately $0.7 million, $0.7 million and $0.7 million for the twelve months ended December 31, 2023, 2022 and 2021, respectively.

The discount rate implicit within the Company’s leases is generally not determinable and therefore the Company determines the discount rate based on its incremental borrowing rate based on the information available at commencement date. As of December 31, 2023, the operating lease liabilities reflect a weighted-average discount rate of 7.89%.

The following table sets forth the operating lease right-of-use assets and liabilities as of December 31, 2023 (in thousands):


Assets
Operating Lease Right-of-Use Assets	$	1,482

Liabilities
Operating Lease Short-term Liabilities (recorded within Accrued liabilities)	$	642
Operating Lease Long-term Liabilities (recorded within Lease-related obligations)	1,177
Total Operating Lease Liabilities	$	1,819

Operating lease payments over the remainder of the lease terms are as follows (in thousands):


Years Ending December 31,	As of December 31, 2023



2024	759
2025	781
2026	467
Total future minimum rental payments	$	2,007
Less amount of lease payments representing interest	188
Total present value of lease payments	$	1,819

For the twelve months ended December 31, 2023 and 2022, the Company made lease payments of approximately $0.7 million and $0.6 million, respectively, which are included in operating cash flows.

Significance of Revenue Source

The Company is the recipient of federal research contract funds from BARDA. Periodic audits are required under the grant and contract agreements and certain costs may be questioned as appropriate under the agreements. At December 31, 2023 and 2022, the Company had recorded a $0.1 million provision for potential refundable amounts.