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Related Party Transactions
 12 Months Ended
Dec. 31, 2023
Related Party Transactions [Abstract]  
Related Party Transactions Related Party Transactions
Plumbline Life Sciences, Inc.
The Company owned 597,808 shares of common stock in PLS as of December 31, 2023 and 2022, representing a 17.8% and 18.7% ownership interest, respectively. One of the Company's directors, Dr. David B. Weiner, acts as a consultant to PLS.
Revenue recognized from PLS consists of milestone, license and patent fees. For the years ended December 31, 2023, 2022 and 2021, the Company recognized revenue from PLS of $0, $34,000 and $245,000, respectively. At December 31, 2023 and 2022, the Company had an accounts receivable balance of $0 and $59,000, respectively, related to PLS.

The Wistar Institute
The Company's director Dr. David B. Weiner is a director of the Vaccine Center of The Wistar Institute ("Wistar"). Dr. Weiner is also the Executive Vice President of Wistar.
In March 2016, the Company entered into collaborative research agreements with Wistar for preventive and therapeutic DNA-based immunotherapy applications and products developed by Dr. Weiner and Wistar for the treatment of cancers and infectious diseases. Under the terms of the agreement, the Company reimbursed Wistar for all direct and indirect costs incurred
in the conduct of the collaborative research, not to exceed $3.1 million during the five-year term of the agreement. In March 2021, upon expiration of the March 2016 agreements, the Company entered into new collaborative research agreements with Wistar with the same terms. The Company has the exclusive right to in-license new intellectual property developed under this agreement.
In 2020, the Company received a $10.7 million sub-grant through Wistar, which was amended in 2021 to $13.6 million, for the preclinical development and translational studies of dMAbs as countermeasures for COVID-19, with funding extended through August 2024. The sub-grant also includes an option for an additional $1.6 million in funding through September 2025.
In December 2022, the Company received a $1.2 million sub-grant through Wistar with funding through November 2023, with an option for an additional $5.4 million in funding through November 2027. The Company will support the Wistar lead consortium in the research and development of synthetic DNA-launched nanoparticles (dLNPs) for vaccination against HIV infection.
Deferred grant funding recognized from Wistar and recorded as contra-research and development expense is related to work performed by the Company on the research sub-contract agreements. For the years ended December 31, 2023 and 2022, the Company recorded $1.0 million and $8.7 million, respectively, as contra-research and development expense from Wistar.
Research and development expenses recorded from Wistar relate primarily to the collaborative research agreements and sub-contract agreements related to Gates and CEPI (see Note 4). Research and development expenses recorded from Wistar for the years ended December 31, 2023, 2022 and 2021 were $1.8 million, $1.4 million and $2.9 million, respectively. At December 31, 2023 and 2022, the Company had an accounts receivable balance of $2.4 million and $9.9 million, respectively, and an accounts payable and accrued liability balance of $1.1 million and $1.2 million, respectively, related to Wistar. As of December 31, 2023 and 2022, the Company had a prepaid expense balance of $20,000 and $375,000, respectively, and recorded $22,000 and $88,000, respectively, as deferred grant funding on its consolidated balance sheet related to Wistar.