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Earn-out Milestone Liability (Tables)
12 Months Ended
Dec. 31, 2020
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 2019 and 2020:

 

Balance at January 1, 2019   $ 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  
Non-cash loss from the adjustment for the change in fair value included in 2020 net loss     1,300,291  
Balance at December 31, 2020   $ 7,018,000