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Borrowings (Tables) | 6 Months Ended
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Jun. 30, 2017
Summary of Borrowings | Borrowings consist of the following (in thousands):
|  | June 30, 2017 |  |  | December 31, 2016 |
Facility Financing Obligation (2019 Notes) |  |  |  |  |  |  |  |
Principal amount |  | $ | 60,000 |  |  | $ | 75,000 |
Unamortized debt discount |  |  | (2,516 | ) |  |  | (3,661 | )
Net carrying amount |  | $ | 57,484 |  |  | $ | 71,339 |
Senior Convertible Notes (2018 Notes) |  |  |  |  |  |  |  |
Principal amount |  | $ | 27,690 |  |  | $ | 27,690 |
Unamortized premium |  |  | 306 |  |  |  | 426 |
Unaccreted debt issuance costs |  |  | (347 | ) |  |  | (481 | )
Net carrying amount |  | $ | 27,649 |  |  | $ | 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 during the three and six months ended June 30, 2017 and 2016, which includes the acceleration of the debt discount and issuance costs related to the transactions disclosed above, are as follows (in thousands):
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
Accretion expense—debt issuance cost |  | $ | 24 |  |  | $ | 9 |  |  | $ | 32 |  |  | $ | 17 |
Accretion expense—debt discount |  | $ | 686 |  |  | $ | 433 |  |  | $ | 1,133 |  |  | $ | 852 |
Schedule of Amortization of Premium and Accretion of Debt Issuance Costs | Amortization of the premium and accretion of debt issuance costs related to the 2018 notes for the three and six months ended June 30, 2017 and 2016 are as follows:
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
Amortization of debt premium |  | $ | 61 |  |  | $ | 58 |  |  | $ | 120 |  |  | $ | 115 |
Accretion expense—debt issuance cost |  | $ | 68 |  |  | $ | 63 |  |  | $ | 134 |  |  | $ | 126 |

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