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Fair Values of Financial Instruments - Schedule of Fair Value of Assets and Liabilities (Details) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Investment securities, available for sale | $ 14,257,998 | $ 12,724,020
Earn-out milestone liability | 8,907,664 | 12,538,525
Corporate Debt Securities [Member] |  |
Investment securities, available for sale | 14,257,998 | 12,724,020
Fair Value, Measurements, Recurring [Member] |  |
Earn-out milestone liability | 8,907,664 | 12,538,525
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Earn-out milestone liability |  |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Earn-out milestone liability |  |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Earn-out milestone liability | 8,907,664 | 12,538,525
Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member] |  |
Investment securities, available for sale | 14,257,998 | 12,724,020
Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Investment securities, available for sale |  |
Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Investment securities, available for sale | 14,257,998 | 12,724,020
Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Investment securities, available for sale |  |
Fair Value, Measurements, Non-Recurring [Member] | In Process R&D [Member] |  |
Liabilities, fair value | 15,736,491 |
Fair Value, Measurements, Non-Recurring [Member] | In Process R&D [Member] |  |
Liabilities, fair value |  | 20,246,491
Fair Value, Measurements, Non-Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | In Process R&D [Member] |  |
Liabilities, fair value |  |
Fair Value, Measurements, Non-Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | In Process R&D [Member] |  |
Liabilities, fair value |  |
Fair Value, Measurements, Non-Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | In Process R&D [Member] |  |
Liabilities, fair value |  |
Fair Value, Measurements, Non-Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | In Process R&D [Member] |  |
Liabilities, fair value |  |
Fair Value, Measurements, Non-Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | In Process R&D [Member] |  |
Liabilities, fair value | $ 15,736,491 |
Fair Value, Measurements, Non-Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | In Process R&D [Member] |  |
Liabilities, fair value |  | $ 20,246,491

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as current. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26626-111562 + Details
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