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Borrowings (Tables) | 6 Months Ended
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Jun. 30, 2019
Debt Disclosure [Abstract] |
Summary of Carrying Amount of Borrowings | Carrying amount of borrowings consist of the following, exclusive of $9.1 million accrued interest owed to the related party that will be capitalized and paid-in-kind (in thousands):
|  | June 30, 2019 |  |  | December 31, 2018 |
Facility financing obligation |  | $ | 8,974 |  |  | $ | 11,298 |
Senior convertible notes |  |  | 19,031 |  |  |  | 19,099 |
Note payable to related party |  |  | 71,981 |  |  |  | 72,089 |
Total debt - net carrying amount |  | $ | 99,986 |  |  | $ | 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) |  |
May 2019 |  |  |  | $2.5 million (cash)
July 2019 |  | $2.4 million (cash) |  |
|  | $1.6 million (equity exchange) |  |
Accretion of Debt Issuance Cost and Debt Discount | Accretion of debt issuance cost and debt discount during the three and six months ended June 30, 2019 and 2018, are as follows (in thousands):
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
Amortization of debt discount |  | $ | 69 |  |  | $ | 385 |  |  | $ | 141 |  |  | $ | 698 |
Accretion expense - debt issuance cost |  | $ | 21 |  |  | $ | 10 |  |  |  | 35 |  |  | $ | 17 |
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 and six months ended June 30, 2019 and 2018 are as follows (in thousands):
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
Amortization of debt premium |  | $ | 36 |  |  | $ | 40 |  |  | $ | 72 |  |  | $ | 83 |
Accretion expense - debt issuance cost |  |  | 2 |  |  | $ | 1 |  |  | $ | 4 |  |  | $ | 1 |

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