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Term Loan Agreements and Long Term Debt - Term Loan Agreement and Revolving Loan (Details) |  |  | 12 Months Ended
--- | --- | --- | ---
Oct. 26, 2016 | Oct. 25, 2016 USD ($) item | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Debt Instrument [Line Items] |  |  |  |  |
Exit fee percent |  | 5.00% |  |  |
Debt issuance costs |  |  | $ 29,472 | $ 800,847 | $ 180,139
Three Peaks Loan |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Payments of Debt Extinguishment Costs |  | $ 2,300,000 |  |  |
MidCap Loan |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Proceeds from issuance of debt |  | 25,000,000 |  |  |
Debt issuance costs |  | 800,000 |  |  |
Term Loan Agreement | MidCap Loan |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Face amount |  | $ 21,000,000 | $ 21,000,000 | $ 21,000,000 |
Number of months requiring principal and interest payments | item |  | 30 |  |  |
Interest payable, percent |  | 8.00% | 8.00% | 8.00% |
Interest rate spread |  | 0.50% | 0.50% | 0.50% |
Effective interest rate (as a percent) |  |  | 9.36% | 9.36% |
Annual agency fee, percent of aggregate principal amount |  | (0.25%) |  |  |
Minimum prepayment amount |  | $ 2,500,000 |  |  |
Integral multiple of the minimum prepayment amount |  | $ 1,000,000 |  |  |
Maximum number of partial voluntary prepayments allowed | item |  | 3 |  |  |
Prepayment fee percent, year one |  | 3.00% |  |  |
Prepayment fee percent, year two |  | 2.00% |  |  |
Prepayment fee percent, thereafter |  | 1.00% |  |  |
Revolver Loan Agreement | MidCap Loan |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest payable, percent |  | 4.50% | 4.50% | 4.50% |
Interest rate spread |  | 0.50% | 0.50% | 0.50% |
Effective interest rate (as a percent) |  |  | 5.86% | 5.86% |
Prepayment fee percent, year one | 3.00% |  |  |  |
Prepayment fee percent, year two | 2.00% |  |  |  |
Prepayment fee percent, thereafter | 1.00% |  |  |  |
Percent of Borrowing Base which accrues interest |  | 30.00% |  |  |
Maximum line of credit amount |  | $ 10,000,000 | $ 10,000,000 | $ 10,000,000 |
Borrowing amount available |  | $ 7,700,000 | $ 4,000,000 |  |
Collateral management fee, percent |  | (0.50%) |  |  |
Unused line fee, percent |  | 0.50% |  |  |
Revolver Loan Agreement | MidCap Loan | Maximum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maximum line of credit amount |  | $ 15,000,000 |  |  |

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