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Loans Payable (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2017 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) Payment | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Line of Credit Facility [Abstract] |  |  |  |  |  |
Loans payable, current |  | $ 2,750 |  | $ 2,750 |  | $ 0
Amortization expense, deferred debt issuance costs and debt discounts |  | 374 | $ 471 | 1,297 | $ 1,391 |
Unamortized deferred debt issuance cost and deferred debt discounts |  | 3,196 |  | 3,196 |  | $ 4,493
Perceptive Credit Opportunities Fund, LP [Member] | Line of Credit [Member] |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |
Borrowing amount |  | $ 45,000 |  | $ 45,000 |  |
Warrant to purchase senior common equity interest ratio to fully diluted common units |  | 4.50% |  | 4.50% |  |
Credit facility, remaining borrowing capacity | $ 5,000 |  |  |  |  |
Credit facility, maximum borrowing capacity |  | $ 50,000 |  | $ 50,000 |  |
Debt maturity date |  |  |  | Dec. 16, 2020 |  |
Debt instrument base rate |  | 2.00% |  | 2.00% |  |
Debt instrument variable interest rate |  |  |  | 9.75% |  |
Loans payable, current |  | $ 2,750 |  | $ 2,750 |  |
Financial covenant requirement, Consecutive period for maintaining minimum revenues |  |  |  | 12 months |  |
Perceptive Credit Opportunities Fund, LP [Member] | Line of Credit [Member] | Minimum [Member] |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |
Debt instrument effective interest rate |  | 11.75% |  | 11.75% |  |
Financial covenant requirement, monthly cash balance |  | $ 4,000 |  | $ 4,000 |  |
Perceptive Credit Opportunities Fund, LP [Member] | Line of Credit [Member] | May 2019 [Member] |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |
Frequency of periodic principal payment |  |  |  | Monthly |  |
Number of loan principal payments | Payment |  |  |  | 7 |  |
Monthly principal payment amount |  |  |  | $ 550 |  |
Perceptive Credit Opportunities Fund, LP [Member] | Line of Credit [Member] | December 2019 [Member] |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |
Frequency of periodic principal payment |  |  |  | Monthly |  |
Monthly principal payment amount |  |  |  | $ 750 |  |
Perceptive Credit Opportunities Fund, LP [Member] | Line of Credit [Member] | LIBOR [Member] |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |
Term of variable rate |  |  |  | 1 month |  |
White Oaks Global Advisors, LLC [Member] | Line of Credit [Member] |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |
Payment of existing debt obligation | $ (37,500) |  |  |  |  |

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