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Revenue Recognition and Concentration of Credit Risk | 12 Months Ended
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Dec. 31, 2021
Revenue from Contract with Customer [Abstract] |
Revenue Recognition and Concentration of Credit Risk | Revenue Recognition and Concentration of Credit RiskDuring the years ended December 31, 2021, 2020 and 2019, 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 | 2021 Revenue |  | % of Total Revenue |  | 2020 Revenue |  | % of Total Revenue |  | 2019 Revenue |  | % of Total Revenue
AstraZeneca | $ | 41,659 |  |  | 2 | % |  | $ | 170,587 |  |  | 2 | % |  | $ | 3,194,877 |  |  | 78 | %
Advaccine | — |  |  | — |  |  | 5,000,000 |  |  | 68 |  |  | — |  |  | — |
Plumbline Life Sciences, Inc. (affiliated entity) | 245,310 |  |  | 14 |  |  | 1,370,396 |  |  | 18 |  |  | — |  |  | — |
Department of Defense | 754,853 |  |  | 43 |  |  | — |  |  | — |  |  | — |  |  | — |
All other, including affiliated entities | 732,936 |  |  | 41 |  |  | 870,237 |  |  | 12 |  |  | 917,053 |  |  | 22 |
Total revenue | $ | 1,774,758 |  |  | 100 | % | 1 | $ | 7,411,220 |  |  | 100 | % |  | $ | 4,111,930 |  |  | 100 | %
Of the total revenue recognized during the year ended December 31, 2021, $46,000 was in deferred revenue as of December 31, 2020. During the year ended December 31, 2020, the Company recognized revenue of $127,000 that was included in deferred revenue at December 31, 2019. Performance obligations are generally satisfied within 12 months of the initial contract date. As of December 31, 2021, $3.6 million, or 65%, and $1.9 million, or 34%, of the Company's accounts receivable was attributable to the DoD and the CEPI MERS grant, respectively. As of December 31, 2020, $11.4 million, or 62%, and $7.1 million, or 38%, of the Company's accounts receivable was attributable to the DoD and Advaccine, respectively. There is minimal credit risk with these customers based upon collection history, their size and financial condition. Accordingly, the Company does not consider it necessary to record a reserve for uncollectible 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 -Publisher FASB -Name Accounting Standards Codification -Topic 606 -URI http://asc.fasb.org/topic&trid=49130388 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130551-203045 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130556-203045 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130554-203045 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130550-203045 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130554-203045 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130554-203045 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130554-203045 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130558-203045 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130554-203045 + Details
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