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Fair Value Measurements - Schedule of Fair Value of Assets and Liabilities (Details) - USD ($)
Sep. 30, 2018
Dec. 31, 2017
Investment securities, available for sale $ 18,579,731 $ 12,724,020
Earn-out milestone liability 8,970,854 12,538,525
Fair Value, Measurements, Recurring [Member]    
Investment securities, available for sale 18,579,731 12,724,020
Earn-out milestone liability 8,970,854 12,538,525
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Investment securities, available for sale 18,579,731 12,724,020
Earn-out milestone liability
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Investment securities, available for sale
Earn-out milestone liability
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Investment securities, available for sale
Earn-out milestone liability $ 8,970,854 $ 12,538,525