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Goodwill and Intangible Assets (Tables) | 3 Months Ended
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Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Summary of intangible assets by major asset class | The following sets forth the goodwill and intangible assets by major asset class:
|  |  | March 31, 2018 |  | December 31, 2017
| Useful Life (Yrs) | Gross |  | Accumulated Amortization |  | Net Book Value |  | Gross |  | Accumulated Amortization |  | Net Book Value
Indefinite lived: |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill(a) |  |  | $ | 10,513,371 |  |  | $ | — |  |  | $ | 10,513,371 |  |  | $ | 10,513,371 |  |  | $ | — |  |  | $ | 10,513,371 |
Definite lived: |  |  |  |  |  |  |  |  |  |  |  |  |
Patents | 8 – 17 |  | 5,802,528 |  |  | (5,696,775 | ) |  | 105,753 |  |  | 5,802,528 |  |  | (5,681,673 | ) |  | 120,855 |
Licenses | 8 – 17 |  | 1,323,761 |  |  | (1,197,796 | ) |  | 125,965 |  |  | 1,323,761 |  |  | (1,190,609 | ) |  | 133,152 |
CELLECTRA®(b) | 5 – 11 |  | 8,106,270 |  |  | (7,358,878 | ) |  | 747,392 |  |  | 8,106,270 |  |  | (7,252,108 | ) |  | 854,162 |
GHRH(b) | 11 |  | 335,314 |  |  | (279,868 | ) |  | 55,446 |  |  | 335,314 |  |  | (271,948 | ) |  | 63,366 |
Bioject(c) | 2 – 15 |  | 5,100,000 |  |  | (1,616,389 | ) |  | 3,483,611 |  |  | 5,100,000 |  |  | (1,405,556 | ) |  | 3,694,444 |
Other(d) | 18 |  | 4,050,000 |  |  | (2,962,500 | ) |  | 1,087,500 |  |  | 4,050,000 |  |  | (2,906,250 | ) |  | 1,143,750 |
Total intangible assets |  |  | 24,717,873 |  |  | (19,112,206 | ) |  | 5,605,667 |  |  | 24,717,873 |  |  | (18,708,144 | ) |  | 6,009,729 |
Total goodwill and intangible assets |  |  | $ | 35,231,244 |  |  | $ | (19,112,206 | ) |  | $ | 16,119,038 |  |  | $ | 35,231,244 |  |  | $ | (18,708,144 | ) |  | $ | 16,523,100 |
(a) | Goodwill was recorded from the Inovio AS acquisition in January 2005, the acquisition of VGX in June 2009 and the acquisition of Bioject in April 2016 for $3.9 million, $6.2 million and $400,000, respectively.
(b) | CELLECTRA® and GHRH are developed technologies which were recorded from the acquisition of VGX.
(c) | Bioject intangible assets represent the estimated fair value of developed technology and intellectual property which were recorded from the Bioject asset acquisition.
(d) | Other intangible assets represent the estimated fair value of acquired intellectual property from the Inovio AS acquisition.

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- Definition Tabular disclosure of goodwill and intangible assets, which may be broken down by segment or major class. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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