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Earn-out Milestone Liability (Tables) | 12 Months Ended
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Dec. 31, 2018
Earn-out Milestone Liability |
Schedule of Changes in Earn-out Milestone Liability | The following is a summary of the changes in the earn-out milestone liability for 2017 and 2018:
Balance at January 1, 2017 |  | $ | 13,188,226 |
Non-cash gain from the adjustment for the change in fair value included in 2017 net loss |  |  | (649,701 | )
Balance at December 31, 2017 |  |  | 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 |

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