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Intangible Assets (Schedule of Intangible Assets) (Details) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
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Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, net | $ 33,655,099 | $ 21,444,545
Product and License Rights |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, gross | 36,573,941 | 21,879,981
Accumulated amortization | (8,405,188) | (6,564,007)
Intangible assets, net | 28,168,753 | 15,315,974
Patents |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, gross | 9,428,266 | 9,177,647
Accumulated amortization | (4,087,273) | (3,158,990)
Intangible assets, net | 5,340,993 | 6,018,657
Trademarks |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, gross | 154,373 | 118,934
Accumulated amortization | (9,020) | (9,020)
Intangible assets, net | $ 145,353 | $ 109,914

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