Related Party Transactions	6 Months Ended
Related Party Transactions	Jun. 30, 2021
Related Party Transaction, Due from (to) Related Party [Abstract]
Related Party Transactions	Related Party Transactions Plumbline Life Sciences, Inc. The Company owned 597,808 shares of common stock in PLS as of June 30, 2021, representing a 19.7% ownership interest, and 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 three and six months ended June 30, 2021, the Company recognized revenue from PLS of $75,000 and $125,000, respectively, and $64,000 and $1.2 million, for the three and six months ended June 30, 2020, respectively. At June 30, 2021 and December 31, 2020, the Company had an accounts receivable balance of $99,000 and $67,000, 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 agreements. 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 the agreements. In November 2016, the Company received a $6.1 million sub-grant through Wistar to develop a dMAb against the Zika infection, with funding extended through December 2021. The Company is also a collaborator with Wistar on an Integrated Preclinical/Clinical AIDS Vaccine Development grant from the NIAID, with funding through February 2022. In 2020, the Company received a $10.7 million sub-grant through Wistar for the preclinical development and translational studies of dMAbs as countermeasures for COVID-19, with funding through September 2022. The sub-grant also includes an option for an additional $6.0 million in funding through September 2024. 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 three and six months ended June 30, 2021, the Company recorded $381,000 and $610,000, respectively, and for the three and six months ended June 30, 2020 the Company recorded $73,000 and $691,000, 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 the Bill & Melinda Gates Foundation and CEPI (see Note 15). Research and development expenses recorded from Wistar for the three and six months ended June 30, 2021 were $1.2 million and $1.6 million, respectively. Research and development expenses recorded from Wistar for the three and six months ended June 30, 2020 were $408,000 and $770,000, respectively. At June 30, 2021 and December 31, 2020, the Company had an accounts receivable balance of $617,000 and $425,000, respectively, and an accounts payable and accrued liability balance of $1.8 million and $643,000, respectively, related to Wistar. As of June 30, 2021, the Company had a prepaid expense balance of $303,000 and recorded $69,000 as deferred grant funding on the condensed consolidated balance sheet related to Wistar.