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Borrowings (Tables) | 12 Months Ended
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Dec. 31, 2017
Debt Disclosure [Abstract] |
Summary of Borrowings | Borrowings consist of the following (in thousands):
|  | December 31, |
|  | 2017 |  |  | 2016 |
Facility Financing Obligation (2019 Notes and Tranche B Notes) |  |  |  |  |  |  |  |
Principal amount |  | $ | 54,407 |  |  | $ | 75,000 |
Unamortized debt issuance costs and debt discount |  |  | (1,662 | ) |  |  | (3,661 | )
Net carrying amount |  | $ | 52,745 |  |  | $ | 71,339 |
Senior Convertible Notes (2021 Notes) |  |  |  |  |  |  |  |
Principal amount |  | $ | 23,690 |  |  | $ | 27,690 |
Unamortized premium |  |  | 721 |  |  |  | 426 |
Unaccreted debt issuance costs |  |  | — |  |  |  | (481 | )
Net carrying amount |  | $ | 24,411 |  |  | $ | 27,635 |
Note payable to principal stockholder - net carrying amount |  | $ | 79,666 |  |  | $ | 49,521 |
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, 2017, 2016 and 2015 were as follows (in thousands):
|  | December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Accretion expense - debt issuance cost |  | $ | 31 |  |  | $ | 35 |  |  |  | 35 |
Accretion expense - debt discount |  | $ | 1,700 |  |  | $ | 1,722 |  |  |  | 1,553 |

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