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Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of intangible assets | Intangible assets and Goodwill consisted of the following at December 31:
|  | 2018 |  | 2017
Product and license rights |  | $ | 36,573,941 |  | $ | 21,879,981
Less: accumulated amortization |  | (8,405,188) |  | (6,564,007)
Total product and license rights |  | 28,168,753 |  | 15,315,974
Patents |  | 9,428,266 |  | 9,177,647
Less: accumulated amortization |  | (4,087,273) |  | (3,158,990)
Total patents |  | 5,340,993 |  | 6,018,657
Trademarks |  | 154,373 |  | 118,934
Less: accumulated amortization |  | (9,020) |  | (9,020)
Total trademarks |  | 145,353 |  | 109,914
Total intangible assets |  | $ | 33,655,099 |  | $ | 21,444,545
Goodwill |  | $ | 784,000 |  | $ | —
Schedule of expected amortization expense of intangible assets | Amortization expense related to product and license rights, trademarks and patents were as follows for the years ended December 31:
|  | 2018 |  | 2017 |  | 2016
Amortization expense |  | $ | 2,769,466 |  | $ | 2,436,222 |  | $ | 2,194,039
The expected amortization expense for the Company's current balance of intangible assets are as follows:
Year ending December 31: |  |
2019 |  | $ | 3,658,612
2020 |  | 3,737,638
2021 |  | 3,737,638
2022 |  | 3,426,180
2023 and thereafter |  | 19,095,031
|  | $ | 33,655,099

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