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Goodwill and Intangible Assets - Schedule Goodwill and Intangible Assets (Details) - USD ($) | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017 | 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 | (19,112,206) | (18,708,144) |  |  |
Intangible assets, net book value | 5,605,667 | 6,009,729 |  |  |
Total goodwill and intangible assets, gross | 35,231,244 | 35,231,244 |  |  |
Total goodwill and intangible assets, net book value | $ 16,119,038 | 16,523,100 |  |  |
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 | (5,696,775) | (5,681,673) |  |  |
Intangible assets, net book value | $ 105,753 | 120,855 |  |  |
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 | (1,197,796) | (1,190,609) |  |  |
Intangible assets, net book value | $ 125,965 | 133,152 |  |  |
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 | (7,358,878) | (7,252,108) |  |  |
Intangible assets, net book value | $ 747,392 | 854,162 |  |  |
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 | (279,868) | (271,948) |  |  |
Intangible assets, net book value | 55,446 | 63,366 |  |  |
Bioject |  |  |  |  |
Definite lived: |  |  |  |  |
Intangible assets, gross | 5,100,000 | 5,100,000 |  |  |
Intangible assets, accumulated amortization | (1,616,389) | (1,405,556) |  |  |
Intangible assets, net book value | $ 3,483,611 | 3,694,444 |  |  |
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 | (2,962,500) | (2,906,250) |  |  |
Intangible assets, net book value | $ 1,087,500 | $ 1,143,750 |  |  |

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