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Borrowings (Tables) | 3 Months Ended
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Mar. 31, 2019
Debt Disclosure [Abstract] |
Summary of Borrowings | Borrowings consist of the following (in thousands):
|  | March 31, 2019 |  |  | December 31, 2018 |
Facility Financing Obligation (2019 Notes and Tranche B Notes) |  |  |  |  |  |  |  |
Principal amount |  | $ | 11,495 |  |  | $ | 11,495 |
Unamortized debt issuance costs and debt discount |  |  | (110 | ) |  |  | (197 | )
Net carrying amount |  | $ | 11,385 |  |  | $ | 11,298 |
Senior Convertible Notes (2021 Notes) |  |  |  |  |  |  |  |
Principal amount |  | $ | 18,690 |  |  | $ | 18,690 |
Unamortized debt issuance costs and debt premium |  |  | 375 |  |  |  | 409 |
Net carrying amount |  | $ | 19,065 |  |  | $ | 19,099 |
Note payable to related party - net carrying amount |  | $ | 72,036 |  |  | $ | 72,089 |
Total debt - net carrying amount |  | $ | 102,486 |  |  | $ | 102,486 |
Schedule of Principal Payment Settlement in Cash or Exchange for Issuance of Shares |
Date |  | 2019 notes |  | Tranche B notes
July 2016 |  | $5.0 million (cash) |  |
April 2017 |  | $5.0 million (equity exchange) |  | $4.0 million (cash) $1.0 million (equity exchange)
June 2017 |  | $5.0 million (equity exchange) |  |
November 2017 |  | $5.6 million (equity exchange) |  |
January 2018 |  | $3.2 million (equity exchange) |  |
March 2018 |  | $1.3 million (equity exchange) |  | $5.0 million (equity exchange)
June 2018 |  | $3.0 million (equity exchange) |  | $3.0 million (equity exchange)
July 2018 |  | $2.0 million (cash) $10.0 million (equity exchange) |  | $2.0 million (equity exchange)
September 2018 |  | $8.0 million (equity exchange) |  | $2.5 million (equity exchange)
October 2018 |  | $3.0 million (cash) |  |
Accretion of Debt Issuance Cost and Debt Discount | Accretion of debt issuance cost and debt discount during the three months ended March 31, 2019 and 2018, are as follows (in thousands):
|  | Three Months Ended March 31, |
|  | 2019 |  |  | 2018 |
Accretion expense - debt issuance cost |  | $ | 14 |  |  | $ | 6 |
Accretion expense - debt discount |  | $ | 72 |  |  | $ | 310 |
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 three months ended March 31, 2019 and 2018 are as follows:
|  | Three Months Ended March 31, |
|  | 2019 |  |  | 2018 |
Amortization of debt premium |  | $ | 36 |  |  | $ | 43 |
Accretion expense - debt issuance cost |  |  | 2 |  |  | $ | — |

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