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Goodwill and Intangible Assets - Schedule Goodwill and Intangible Assets (Details) - USD ($) | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018 | 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 | 24,717,873 | 24,717,873 |  |  |
Intangible assets, accumulated amortization | (20,757,416) | (19,957,728) |  |  |
Intangible assets, net book value | 3,960,457 | 4,760,145 |  |  |
Total goodwill and intangible assets, gross | 35,231,244 | 35,231,244 |  |  |
Total goodwill and intangible assets, net book value | $ 14,473,828 | 15,273,516 |  |  |
Minimum |  |  |  |  |
Definite lived: |  |  |  |  |
Useful life | 2 years |  |  |  |
Maximum |  |  |  |  |
Definite lived: |  |  |  |  |
Useful life | 18 years |  |  |  |
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 |  |
Patents |  |  |  |  |
Definite lived: |  |  |  |  |
Useful life | 17 years |  |  |  |
Intangible assets, gross | $ 5,802,528 | 5,802,528 |  |  |
Intangible assets, accumulated amortization | (5,787,384) | (5,742,079) |  |  |
Intangible assets, net book value | $ 15,144 | 60,449 |  |  |
Patents | Minimum |  |  |  |  |
Definite lived: |  |  |  |  |
Useful life | 8 years |  |  |  |
Patents | Maximum |  |  |  |  |
Definite lived: |  |  |  |  |
Useful life | 17 years |  |  |  |
Licenses |  |  |  |  |
Definite lived: |  |  |  |  |
Intangible assets, gross | $ 1,323,761 | 1,323,761 |  |  |
Intangible assets, accumulated amortization | (1,240,917) | (1,219,357) |  |  |
Intangible assets, net book value | $ 82,844 | 104,404 |  |  |
Licenses | Minimum |  |  |  |  |
Definite lived: |  |  |  |  |
Useful life | 8 years |  |  |  |
Licenses | Maximum |  |  |  |  |
Definite lived: |  |  |  |  |
Useful life | 17 years |  |  |  |
CELLECTRA |  |  |  |  |
Definite lived: |  |  |  |  |
Intangible assets, gross | $ 8,106,270 | 8,106,270 |  |  |
Intangible assets, accumulated amortization | (7,999,501) | (7,679,190) |  |  |
Intangible assets, net book value | $ 106,769 | 427,080 |  |  |
CELLECTRA | Minimum |  |  |  |  |
Definite lived: |  |  |  |  |
Useful life | 5 years |  |  |  |
CELLECTRA | Maximum |  |  |  |  |
Definite lived: |  |  |  |  |
Useful life | 11 years |  |  |  |
GHRH |  |  |  |  |
Definite lived: |  |  |  |  |
Useful life | 11 years |  |  |  |
Intangible assets, gross | $ 335,314 | 335,314 |  |  |
Intangible assets, accumulated amortization | (327,392) | (303,630) |  |  |
Intangible assets, net book value | 7,922 | 31,684 |  |  |
Bioject |  |  |  |  |
Definite lived: |  |  |  |  |
Intangible assets, gross | 5,100,000 | 5,100,000 |  |  |
Intangible assets, accumulated amortization | (2,102,222) | (1,882,222) |  |  |
Intangible assets, net book value | $ 2,997,778 | 3,217,778 |  |  |
Bioject | Minimum |  |  |  |  |
Definite lived: |  |  |  |  |
Useful life | 2 years |  |  |  |
Bioject | Maximum |  |  |  |  |
Definite lived: |  |  |  |  |
Useful life | 15 years |  |  |  |
Other |  |  |  |  |
Definite lived: |  |  |  |  |
Useful life | 18 years |  |  |  |
Intangible assets, gross | $ 4,050,000 | 4,050,000 |  |  |
Intangible assets, accumulated amortization | (3,300,000) | (3,131,250) |  |  |
Intangible assets, net book value | $ 750,000 | $ 918,750 |  |  |

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