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Fair Value of Financial INstruments - Narrative (Details) - USD ($)
Sep. 30, 2019
Dec. 31, 2018
Sep. 02, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of warrant $ 6,433,427 $ 12,380,939  
Loan outstanding 78,911,307 $ 75,547,597  
Warrants      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of warrant 6,400,000   $ 5,800,000
Senior Secured Term Loan      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Loan outstanding 78,900,000    
Fair Value, Measurements, Recurring | Senior Secured Term Loan | Fair Value, Inputs, Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Loan outstanding $ 85,800,000