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Fair Value of Financial INstruments - Narrative (Details) - USD ($) | Sep. 30, 2019 | Dec. 31, 2018 | Sep. 02, 2016
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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 |  |

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