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Earn-out Milestone Liability (Tables) | 12 Months Ended
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Dec. 31, 2019
Hercules Warrant [Member] |
Schedule of Changes in Earn-out Milestone Liability | The following is a summary of the changes in the earn-out milestone liability for 2018 and 2019:
Balance at January 1, 2018 |  | $ | 12,538,525 |
Non-cash gain from the adjustment for the change in fair value included in 2018 net loss |  |  | (3,630,861 | )
Balance at December 31, 2018 |  |  | 8,907,664 |
Non-cash gain from the adjustment for the change in fair value included in 2019 net loss |  |  | (3,189,955 | )
Balance at December 31, 2019 |  | $ | 5,717,709 |

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