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Fair Value Measurements - Schedule of Fair Value of Assets and Liabilities (Details) - USD ($) | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Investment securities, available for sale | $ 18,579,731 | $ 12,724,020
Earn-out milestone liability | 8,970,854 | 12,538,525
Fair Value, Measurements, Recurring [Member] |  |
Investment securities, available for sale | 18,579,731 | 12,724,020
Earn-out milestone liability | 8,970,854 | 12,538,525
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Investment securities, available for sale | 18,579,731 | 12,724,020
Earn-out milestone liability |  |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Investment securities, available for sale |  |
Earn-out milestone liability |  |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Investment securities, available for sale |  |
Earn-out milestone liability | $ 8,970,854 | $ 12,538,525

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