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Borrowings (Tables) | 12 Months Ended
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Dec. 31, 2018
Debt Disclosure [Abstract] |
Summary of Borrowings | Borrowings consist of the following (in thousands):
|  | December 31, |
|  | 2018 |  |  | 2017 |
Facility Financing Obligation (2019 Notes and Tranche B Notes) |  |  |  |  |  |  |  |
Principal amount |  | $ | 11,495 |  |  | $ | 54,407 |
Unamortized debt issuance costs and debt discount |  |  | (197 | ) |  |  | (1,662 | )
Net carrying amount |  | $ | 11,298 |  |  | $ | 52,745 |
Senior Convertible Notes (2021 Notes) |  |  |  |  |  |  |  |
Principal amount |  | $ | 18,690 |  |  | $ | 23,690 |
Unamortized premium |  |  | 409 |  |  |  | 721 |
Net carrying amount |  | $ | 19,099 |  |  | $ | 24,411 |
Note payable to related party - net carrying amount |  | $ | 72,089 |  |  | $ | 79,666 |
Accretion of Debt Issuance Cost and Debt Discount | Accretion of debt issuance cost and debt discount in connection with the Facility Agreement does not include the acceleration of the debt discount and issuance costs related to the transactions disclosed above as the amounts were included in the loss on extinguishment of debt in the consolidated statement of operations. Accretion of debt issuance cost and debt discount during the years ended December 31, 2018, 2017 and 2016 were as follows (in thousands):
|  | December 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
Accretion expense - debt issuance cost |  | $ | 46 |  |  | $ | 31 |  |  |  | 35 |
Accretion expense - debt discount |  | $ | 1,155 |  |  | $ | 1,700 |  |  |  | 1,722 |
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 notes for the years ended December 31, 2018, 2017 and 2016 are as follows (in thousands):
|  | December 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
Amortization of debt premium |  | $ | 154 |  |  | $ | 232 |  |  |  | 234 |
Accretion expense - debt issuance cost |  | $ | 4 |  |  | $ | 227 |  |  |  | 257 |

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