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Goodwill and Intangible Assets - Schedule Goodwill and Intangible Assets (Details) - USD ($) | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019 | Apr. 30, 2016 | Jun. 30, 2009 | Jan. 31, 2005
Indefinite lived: |  |  |  |  |
Goodwill, gross | $ 10,513,371 | $ 10,513,371 |  |  |
Goodwill, net book value | 10,513,371 | 10,513,371 |  |  |
Definite lived: |  |  |  |  |
Intangible assets, gross | 10,473,761 | 10,473,761 |  |  |
Intangible assets, accumulated amortization | (7,190,221) | (6,779,910) |  |  |
Intangible assets, net book value | 3,283,540 | 3,693,851 |  |  |
Total goodwill and intangible assets, gross | 20,987,132 | 20,987,132 |  |  |
Total goodwill and intangible assets, net book value | 13,796,911 | 14,207,222 |  |  |
Inovio AS |  |  |  |  |
Indefinite lived: |  |  |  |  |
Goodwill, net book value |  |  |  |  | $ 3,900,000
VGX |  |  |  |  |
Indefinite lived: |  |  |  |  |
Goodwill, net book value |  |  |  | $ 6,200,000 |
Bioject |  |  |  |  |
Indefinite lived: |  |  |  |  |
Goodwill, net book value |  |  | $ 400,000 |  |
Licenses |  |  |  |  |
Definite lived: |  |  |  |  |
Intangible assets, gross | 1,323,761 | 1,323,761 |  |  |
Intangible assets, accumulated amortization | (1,269,665) | (1,248,104) |  |  |
Intangible assets, net book value | 54,096 | 75,657 |  |  |
Bioject |  |  |  |  |
Definite lived: |  |  |  |  |
Intangible assets, gross | 5,100,000 | 5,100,000 |  |  |
Intangible assets, accumulated amortization | (2,395,556) | (2,175,556) |  |  |
Intangible assets, net book value | 2,704,444 | 2,924,444 |  |  |
Other |  |  |  |  |
Definite lived: |  |  |  |  |
Intangible assets, gross | 4,050,000 | 4,050,000 |  |  |
Intangible assets, accumulated amortization | (3,525,000) | (3,356,250) |  |  |
Intangible assets, net book value | $ 525,000 | $ 693,750 |  |  |
Weighted Average |  |  |  |  |
Definite lived: |  |  |  |  |
Useful life (in years) | 11 years |  |  |  |
Weighted Average | Licenses |  |  |  |  |
Definite lived: |  |  |  |  |
Useful life (in years) | 10 years |  |  |  |
Weighted Average | Bioject |  |  |  |  |
Definite lived: |  |  |  |  |
Useful life (in years) | 12 years |  |  |  |
Weighted Average | Other |  |  |  |  |
Definite lived: |  |  |  |  |
Useful life (in years) | 18 years |  |  |  |

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