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Geneos Therapeutics, Inc. - Investment In Geneos (Details) - USD ($) | Jun. 30, 2020 | Jun. 01, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Noncontrolling Interest [Line Items] |  |  |
Investment in equity method investments | $ 2,717,241 |  | $ 0
Geneos Therapeutics, Inc. |  |  |
Noncontrolling Interest [Line Items] |  |  |
Investment owned (in shares) |  | 5,113,206 |
Investment in equity method investments |  | $ 3,618,998 |
Common stock | Geneos Therapeutics, Inc. |  |  |
Noncontrolling Interest [Line Items] |  |  |
Investment owned (in shares) |  | 3,000,000 |
Share price (in dollars per share) |  | $ 0.273 |
Investment in equity method investments | $ 0 | $ 819,000 |
Preferred stock | Geneos Therapeutics, Inc. |  |  |
Noncontrolling Interest [Line Items] |  |  |
Investment owned (in shares) |  | 2,113,206 |
Share price (in dollars per share) |  | $ 1.325 |
Investment in equity method investments |  | $ 2,799,998 |

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