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Fair Value of Financial INstruments - Narrative (Details) - USD ($)	Jun. 30, 2018	Dec. 31, 2017	Sep. 02, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of warrant	$ 14,408,991	$ 11,466,162
Loan outstanding	73,280,477	$ 71,050,324
Warrants
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of warrant	14,400,000		$ 5,800,000
Senior Secured Term Loan
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loan outstanding	73,300,000
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	$ 75,700,000

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price.

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