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Goodwill and Intangible Assets | 3 Months Ended
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Mar. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Intangible Assets | Goodwill and Intangible Assets The following sets forth the goodwill and intangible assets by major asset class:
|  |  | March 31, 2020 |  | December 31, 2019
| Weighted Average 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: |  |  |  |  |  |  |  |  |  |  |  |  |
Licenses | 10 |  | 1,323,761 |  |  | (1,255,291 | ) |  | 68,470 |  |  | 1,323,761 |  |  | (1,248,104 | ) |  | 75,657 |
Bioject(b) | 12 |  | 5,100,000 |  |  | (2,248,889 | ) |  | 2,851,111 |  |  | 5,100,000 |  |  | (2,175,556 | ) |  | 2,924,444 |
Other(c) | 18 |  | 4,050,000 |  |  | (3,412,500 | ) |  | 637,500 |  |  | 4,050,000 |  |  | (3,356,250 | ) |  | 693,750 |
Total intangible assets | 11 |  | 10,473,761 |  |  | (6,916,680 | ) |  | 3,557,081 |  |  | 10,473,761 |  |  | (6,779,910 | ) |  | 3,693,851 |
Total goodwill and intangible assets |  |  | $ | 20,987,132 |  |  | $ | (6,916,680 | ) |  | $ | 14,070,452 |  |  | $ | 20,987,132 |  |  | $ | (6,779,910 | ) |  | $ | 14,207,222 |
(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) | Bioject intangible assets represent the estimated fair value of developed technology and intellectual property which were recorded from the Bioject asset acquisition.
(c) | Other intangible assets represent the estimated fair value of acquired intellectual property from the Inovio AS acquisition.
Aggregate amortization expense on intangible assets for the three months ended March 31, 2020 and 2019 was $137,000 and $267,000, respectively. Estimated aggregate amortization expense is $410,000 for the remainder of fiscal year 2020, $520,000 for 2021, $493,000 for 2022, $276,000 for 2023, $253,000 for 2024 and $1.6 million for 2025 and subsequent years combined.

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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