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Borrowings - Narrative (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Oct. 31, 2017 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term borrowings |  | $ 39,093 |  | $ 39,093 |  | $ 38,963
Term Loan | Pharmakon Term Loan |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total loan proceeds | $ 40,000 |  |  |  |  |
Debt issuance costs | $ 1,300 |  |  |  |  |
Debt period payment, interest only period | 35 months |  |  |  |  |
Debt interest stated percentage (percent) | 11.50% |  |  |  |  |
Debt closing fee percentage (percent) | 1.50% |  |  |  |  |
Debt instrument fee amount | $ 600 |  |  |  |  |
Debt covenant minimum cash balance | $ 5,000 |  |  |  |  |
Effective interest rate during the period (percent) |  | 12.30% | 12.30% | 12.20% | 12.20% |
Term Loan | Pharmakon Term Loan | Prepayment Penalty, 31-48 Months |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt prepayment penalty percentage (percent) | 2.00% |  |  |  |  |
Term Loan | Pharmakon Term Loan | Prepayment Penalty, 49-60 Months |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt prepayment penalty percentage (percent) | 1.00% |  |  |  |  |

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