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Borrowings (Tables) | 3 Months Ended
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Mar. 31, 2018
Debt Disclosure [Abstract] |
Summary of Borrowings | Borrowings consist of the following (in thousands):
|  | March 31, 2018 |  |  | December 31, 2017 |
Facility Financing Obligation (2019 Notes and Tranche B Notes) |  |  |  |  |  |  |  |
Principal amount |  | $ | 45,000 |  |  | $ | 54,407 |
Unamortized debt issuance costs and debt discount |  |  | (1,346 | ) |  |  | (1,662 | )
Net carrying amount |  | $ | 43,654 |  |  | $ | 52,745 |
Senior Convertible Notes (2021 Notes) |  |  |  |  |  |  |  |
Principal amount |  | $ | 23,690 |  |  | $ | 23,690 |
Unamortized premium |  |  | 678 |  |  |  | 721 |
Net carrying amount |  | $ | 24,368 |  |  | $ | 24,411 |
Note payable to related party - net carrying amount |  | $ | 72,247 |  |  | $ | 79,666 |
Total debt - net carrying amount |  | $ | 140,269 |  |  | $ | 156,822 |
Accretion of Debt Issuance Cost and Debt Discount | Accretion of debt issuance cost and debt discount during the three months ended March 31, 2018 and 2017, are as follows (in thousands):
|  | Three Months Ended March 31, |
|  | 2018 |  |  | 2017 |
Accretion expense - debt issuance cost |  | $ | 6 |  |  | $ | 9 |
Accretion expense - debt discount |  | $ | 310 |  |  | $ | 447 |
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 months ended March 31, 2018 and 2017 are as follows:
|  | Three Months Ended March 31, |
|  | 2018 |  |  | 2017 |
Amortization of debt premium |  | $ | 43 |  |  | $ | 59 |
Accretion expense - debt issuance cost |  |  | — |  |  | $ | 66 |

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