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Oxford Term Loans (Tables) | 3 Months Ended
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Mar. 31, 2019
Debt Disclosure [Abstract] |
Schedule of Maturities of Long-term Debt | As of March 31, 2019, the principal amounts of long-term debt maturities during each of the next five fiscal years, and the Final Payment in 2024 which is accreted through interest expense over the life of the Term Loans are as follows (in thousands):
| Principal |  | Final Payment |  | Total
2022 | $ | 26,087 |  |  | $ | — |  |  | $ | 26,087 |
2023 | 39,130 |  |  | — |  |  | 39,130 |
2024 | 9,783 |  |  | 4,125 |  |  | 13,908 |
| $ | 75,000 |  |  | $ | 4,125 |  |  | $ | 79,125 |

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- Definition Tabular disclosure of the combined aggregate amount of maturities and sinking fund requirements for all long-term borrowings for each of the five years following the date of the latest balance sheet date presented. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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