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Borrowings (Tables) | 12 Months Ended
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Dec. 31, 2019
Debt Disclosure [Abstract] |
Summary of Carrying Amount of Borrowings | Carrying amount of borrowings consist of the following (in thousands):
|  | December 31, |
|  | 2019 |  |  | 2018 |
Mann Group promissory notes |  | $ | 70,020 |  |  | $ | 72,089 |
MidCap Credit Facility |  |  | 38,851 |  |  |  | — |
Senior notes |  |  | 10,028 |  |  |  | 19,099 |
Deerfield Credit Facility |  |  | — |  |  |  | 11,298 |
Total debt — net carrying amount |  | $ | 118,899 |  |  | $ | 102,486 |
Schedule of Line of Credit Facility Debt and Key Terms | During the year ended December 31, 2019, the Company discharged its obligations under the Deerfield Credit Facility, entered into the MidCap Credit Facility and restructured the obligations owed to its other lenders. The following table provides a summary of the Company’s debt and key terms:
|  | December 31, |
|  | 2019 |  |  | 2018 |
|  | Amount Due |  |  | Annual interest rate |  |  | Maturity date |  |  | Conversion price |  |  | Amount Due |  |  | Annual interest rate |  |  | Maturity date |  |  | Conversion price |
Mann Group convertible note |  | $35.0 million (plus $1.0 million accrued interest paid-in-kind) |  |  | 7.00% |  |  | November 2024 |  |  | $2.50 per share |  |  | $71.5 million (plus $6.8 million accrued interest paid-in-kind) |  |  |  | 5.84 | % |  | July 2021 |  |  | $4.00 per share |
Mann Group non- convertible note |  | $35.1 million (plus $1.0 million accrued interest paid-in-kind) |  |  | 7.00% |  |  | November 2024 |  |  | N/A |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
MidCap Credit Facility |  | $40.0 million |  |  | one-month LIBOR (2% floor) plus 6.75% |  |  | August 2024 |  |  | N/A |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
2024 convertible notes |  | $5.0 million |  |  | 5.75% |  |  | November 2024 |  |  | $3.00 per share |  |  | $18.7 million |  |  |  | 5.75 | % |  | October 2021 |  |  | $5.15 per share |
June 2020 note |  | $2.6 million |  |  |  | — |  |  | June 2020 |  |  | N/A |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
December 2020 note |  | $2.6 million |  |  |  | — |  |  | December 2020 |  |  | N/A |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Deerfield Credit Facility |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  | $4.0 million |  |  |  | 9.75 | % |  | July 2019 |  |  | N/A |
|  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  | $5.0 million |  |  |  | 9.75 | % |  | August 2019 |  |  | N/A |
|  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  | $2.5 million |  |  |  | 8.75 | % |  | May 2019 |  |  | N/A |
Schedule of Maturities of Our Borrowings | The maturities of our borrowings as of December 31, 2019 are as follows (in thousands):
| Amounts |
2020 | $ | 5,262 |
2021 |  | 4,444 |
2022 |  | 13,333 |
2023 |  | 13,333 |
2024 |  | 83,940 |
Thereafter |  | — |
Total principal payments |  | 120,312 |
Unamortized discount |  | (539 | )
Debt issuance costs |  | (874 | )
Total debt | $ | 118,899 |
Schedule of Amortization of Premium and Accretion of Debt Issuance Costs | Amortization of the premium and accretion of debt issuance costs related to all borrowings for the years ended December 31, 2019 and 2018 are as follows (in thousands):
|  | Year Ended December 31, |
|  | 2019 |  |  | 2018 |
Amortization of debt premium |  | $ | (1,049 | ) |  | $ | (339 | )
Amortization of debt discount |  |  | 295 |  |  |  | 1,155 |
Accretion expense — debt issuance cost |  |  | (111 | ) |  |  | (69 | )

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