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Debt (Tables) | 9 Months Ended
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Sep. 30, 2018
Debt Disclosure [Abstract] |
Debt | Debt at September 30, 2018, consisted of the following (in thousands):
|  | September 30, 2018 |
|  | Principal |  |  | Unamortized Discount |  |  | Total |
Loan and Security Agreement |  | $ | 30,000 |  |  | $ | (148 | ) |  | $ | 29,852 |
Less: debt – current |  |  | (5,714 | ) |  |  | — |  |  |  | (5,714 | )
Debt – non-current |  | $ | 24,286 |  |  | $ | (148 | ) |  | $ | 24,138 |
Debt at December 31, 2017, consisted of the following (in thousands):
|  | December 31, 2017 |
|  | Principal |  |  | Unamortized Discount |  |  | Net Carrying Value |
Loan and Security Agreement |  | $ | 30,000 |  |  | $ | (202 | ) |  | $ | 29,798 |
Less: debt – current |  |  | — |  |  |  | — |  |  |  | — |
Debt – non-current |  | $ | 30,000 |  |  | $ | (202 | ) |  | $ | 29,798 |
Expected Principal and Interest Payments on Debt | Principal and interest payments on debt at September 30, 2018, are expected to be as follows (in thousands):
Year ended December 31, |  | Principal |  |  | Interest |  |  | Total |
2018 |  | $ | — |  |  | $ | 689 |  |  | $ | 689 |
2019 |  |  | 7,857 |  |  |  | 2,470 |  |  |  | 10,327 |
2020 |  |  | 8,571 |  |  |  | 1,689 |  |  |  | 10,260 |
2021 |  |  | 8,572 |  |  |  | 891 |  |  |  | 9,463 |
2022 |  |  | 5,000 |  |  |  | 2,554 |  |  |  | 7,554 |
Total |  | $ | 30,000 |  |  | $ | 8,293 |  |  | $ | 38,293 |

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- Definition Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. + References No definition available. + Details
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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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