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Borrowings - Narrative (Details) - USD ($) | 1 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Oct. 31, 2017 | Aug. 31, 2016 | Oct. 31, 2015 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Debt Instrument [Line Items] |  |  |  |  |  |
Long term borrowings |  |  |  | $ 38,899,000 |  | $ 38,700,000
Amortization of debt discount |  |  |  | 194,000 | $ 235,000 |
Debt covenant minimum cash balance |  |  |  | 5,000,000 |  |
SVB and Oxford Term Loan |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Repayment of debt extinguishment | $ 1,500,000 |  |  |  |  |
Loss on extinguishment of debt | 2,200,000 |  |  |  |  |
Term Loan | SVB and Oxford Term Loan |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt face amount |  | $ 35,200,000.0 |  |  |  |
Debt period payment, interest only period |  | 6 months |  |  |  |
Debt period payment, principal and interest period |  | 27 months |  |  |  |
Debt interest stated percentage |  | 11.00% |  |  |  |
Repayment of debt financing | 29,100,000 |  |  |  |  |
Amortization of debt discount | 700,000 |  |  |  |  |
Term Loan | SVB and Oxford Term Loan | Prime Rate |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate |  | 7.75% |  |  |  |
Term Loan | Pharmakon Term Loan |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long term borrowings |  |  |  | 38,900,000 |  | $ 38,700,000
Debt face amount | $ 40,000,000.0 |  |  |  |  |
Debt period payment, interest only period | 35 months |  |  |  |  |
Debt interest stated percentage | 11.50% |  |  |  |  |
Debt issuance costs | $ 1,300,000 |  |  |  |  |
Debt closing fee percentage | 1.50% |  |  |  |  |
Debt instrument fee amount | $ 600,000 |  |  |  |  |
Debt covenant minimum cash balance | $ 5,000,000 |  |  |  |  |
Debt borrowing capacity |  |  |  | $ 10,000,000 |  |
Debt effective percentage |  |  |  | 12.30% |  | 12.00%
Term Loan | Pharmakon Term Loan | Prepayment Penalty, 31-48 Months |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt prepayment penalty percentage | 2.00% |  |  |  |  |
Term Loan | Pharmakon Term Loan | Prepayment Penalty, 49-60 Months |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt prepayment penalty percentage | 1.00% |  |  |  |  |
Line of Credit | Revolving Credit Facility | SVB and Oxford Term Loan |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of credit maximum borrowing capacity |  |  | $ 4,000,000.0 |  |  |
Line of credit percent of customer accounts receivable |  |  | 80.00% |  |  |
Line of Credit | Revolving Credit Facility | SVB and Oxford Term Loan | Prime Rate |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate |  |  | 3.00% |  |  |

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