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Revenue Recognition and Concentration of Credit Risk | 12 Months Ended
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Dec. 31, 2023
Revenue from Contract with Customer [Abstract] |
Revenue Recognition and Concentration of Credit Risk | Revenue Recognition and Concentration of Credit Risk During the years ended December 31, 2023, 2022 and 2021, the Company recognized revenue from various license and other agreements. The following table indicates the percentage of total revenues in excess of 10% with any single customer:
Customer | 2023 Revenue |  | % of Total Revenue |  | 2022 Revenue |  | % of Total Revenue |  | 2021 Revenue |  | % of Total Revenue
ApolloBio Corporation | $ | 245,056 |  |  | 29 | % |  | $ | — |  |  | — | % |  | $ | — |  |  | — | %
Plumbline Life Sciences, Inc. (affiliated entity) | — |  |  | — |  |  | 33,596 |  |  | — |  |  | 245,310 |  |  | 14 |
U.S. Department of Defense | — |  |  | — |  |  | 9,591,778 |  |  | 94 |  |  | 754,853 |  |  | 43 |
All other, including affiliated entities | 586,954 |  |  | 71 |  |  | 636,894 |  |  | 6 |  |  | 774,595 |  |  | 43 |
Total revenue | $ | 832,010 |  |  | 100 | % |  | $ | 10,262,268 |  |  | 100 | % |  | $ | 1,774,758 |  |  | 100 | %
No revenue recognized during the year ended December 31, 2023 was in deferred revenue as of December 31, 2022. During the year ended December 31, 2022, the Company recognized revenue of $14,000 that was included in deferred revenue at December 31, 2021. Performance obligations are generally satisfied within 12 months of the initial contract date. As of December 31, 2023, the Company had no accounts receivable balance. As of December 31, 2022, all of the Company's accounts receivable was attributable to the CEPI MERS grant. There is minimal credit risk with the Company's customers based upon the short-term nature of the accounts receivable, collection history, their size and financial condition. Accordingly, the Company does not record an allowance for potential credit losses against its accounts receivable.

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- Definition The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-9 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-10 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-15 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-12 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-12 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-12 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-12 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-12 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-13 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Topic 606 -Publisher FASB -URI https://asc.fasb.org//606/tableOfContent + Details
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