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Borrowings (Tables) | 12 Months Ended
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Dec. 31, 2016
Summary of Borrowings | Borrowings consist of the following (in thousands):
|  | December 31, |
|  | 2016 |  |  | 2015 |
Facility Financing Obligation (2019 Notes) |  |  |  |  |  |  |  |
Principal amount |  | $ | 75,000 |  |  | $ | 80,000 |
Unamortized debt discount |  |  | (3,661 | ) |  |  | (5,418 | )
Net carrying amount |  | $ | 71,339 |  |  | $ | 74,582 |
Senior Convertible Notes (2018 Notes) |  |  |  |  |  |  |  |
Principal amount |  | $ | 27,690 |  |  | $ | 27,690 |
Unamortized premium |  |  | 426 |  |  |  | 660 |
Unaccreted debt issuance costs |  |  | (481 | ) |  |  | (737 | )
Net carrying amount |  | $ | 27,635 |  |  | $ | 27,613 |
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 Deerfield financing during the years ended December 31, 2016, 2015 and 2014 are as follows (in thousands):
|  | December 31, |
|  | 2016 |  |  | 2015 |  |  | 2014 |
Accretion expense — debt issuance cost |  | $ | 35 |  |  | $ | 35 |  |  | $ | 326 |
Accretion expense — debt discount |  | $ | 1,722 |  |  | $ | 1,553 |  |  | $ | 7,550 |

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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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