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Borrowings (Tables) | 6 Months Ended
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Jun. 30, 2018
Debt Disclosure [Abstract] |
Summary of Borrowings | Borrowings consist of the following (in thousands):
|  | June 30, 2018 |  |  | December 31, 2017 |
Facility Financing Obligation (2019 Notes and Tranche B notes) |  |  |  |  |  |  |  |
Principal amount |  | $ | 39,000 |  |  | $ | 54,407 |
Unamortized debt issuance costs and debt discount |  |  | (998 | ) |  |  | (1,662 | )
Net carrying amount |  | $ | 38,002 |  |  | $ | 52,745 |
Senior Convertible Notes (2021 Notes) |  |  |  |  |  |  |  |
Principal amount |  | $ | 18,690 |  |  | $ | 23,690 |
Unamortized premium |  |  | 471 |  |  |  | 721 |
Net carrying amount |  | $ | 19,161 |  |  | $ | 24,411 |
Note payable to related party - net carrying amount |  | $ | 72,196 |  |  | $ | 79,666 |
Total debt - net carrying amount |  | $ | 129,359 |  |  | $ | 156,822 |
Accretion of Debt Issuance Cost and Debt Discount | Accretion of debt issuance cost and debt discount during the three and six months ended June 30, 2018 and 2017, are as follows (in thousands):
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Accretion expense - debt issuance cost |  | $ | 10 |  |  | $ | 24 |  |  | $ | 17 |  |  | $ | 32 |
Accretion expense - debt discount |  | $ | 385 |  |  | $ | 686 |  |  | $ | 698 |  |  | $ | 1,133 |
Schedule of Amortization of Premium and Accretion of Debt Issuance Costs | Amortization of the premium and accretion of debt issuance costs related to the 2021 and 2018 notes for the three and six months ended June 30, 2018 and 2017 are as follows:
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Amortization of debt premium |  | $ | 40 |  |  | $ | 61 |  |  | $ | 83 |  |  | $ | 120 |
Accretion expense - debt issuance cost |  |  | 1 |  |  | $ | 68 |  |  | $ | 1 |  |  | $ | 134 |

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