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Long-Term Debt (Tables) | 3 Months Ended
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Mar. 31, 2019
Debt Disclosure [Abstract] |
Interest Expense and Amortization of Debt Issuance Costs and Discounts | Amortization of debt issuance costs and discounts are included in interest expense. Interest expense in the condensed consolidated statements of operations and comprehensive income (loss) relates to the following debt instruments (in thousands):
| Three Months Ended March 31, |
| 2019 |  |  | 2018 |
Novartis note | $ | 186 |  |  | $ | 139 |
SVB loan |  | 242 |  |  |  | — |
Other |  | 1 |  |  |  | 31 |
Total interest expense | $ | 429 |  |  | $ | 170 |

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- Definition Tabular disclosure of aggregate amount of interest expense and the amortization of debt issuance costs and discounts on all borrowings. + References No definition available. + Details
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