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Borrowings (Tables) | 3 Months Ended
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Mar. 31, 2017
Summary of Borrowings | Borrowings consist of the following (in thousands):
|  | March 31, 2017 |  |  | December 31, 2016 |
Facility Financing Obligation (2019 Notes) |  |  |  |  |  |  |  |
Principal amount |  | $ | 75,000 |  |  | $ | 75,000 |
Unamortized debt discount |  |  | (3,205 | ) |  |  | (3,661 | )
Net carrying amount |  | $ | 71,795 |  |  | $ | 71,339 |
Senior Convertible Notes (2018 Notes) |  |  |  |  |  |  |  |
Principal amount |  | $ | 27,690 |  |  | $ | 27,690 |
Unamortized premium |  |  | 367 |  |  |  | 426 |
Unaccreted debt issuance costs |  |  | (415 | ) |  |  | (481 | )
Net carrying amount |  | $ | 27,642 |  |  | $ | 27,635 |
Note payable to principal stockholder - net carrying amount |  | $ | 49,521 |  |  | $ | 49,521 |
Accretion of Debt Issuance Cost and Debt Discount | Accretion of debt issuance cost and debt discount in connection with the Facility Agreement during the three months ended March 31, 2017 and 2016 are as follows (in thousands):
|  | Three Months Ended March 31, |
|  | 2017 |  |  | 2016 |
Accretion expense - debt issuance cost |  | $ | 9 |  |  | $ | 9 |
Accretion expense - debt discount |  | $ | 447 |  |  | $ | 419 |

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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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