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Borrowings (Tables) | 12 Months Ended
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Dec. 31, 2020
Debt Disclosure [Abstract] |
Summary of Carrying Amount of Borrowings | Carrying amount of borrowings consist of the following (in thousands):
|  | December 31, |
|  | 2020 |  |  | 2019 |
Mann Group promissory notes |  | $ | 63,027 |  |  | $ | 70,020 |
MidCap Credit Facility |  |  | 49,335 |  |  |  | 38,851 |
Senior notes (2024 convertible notes) |  |  | 5,000 |  |  |  | 10,028 |
PPP Loan |  |  | 4,873 |  |  |  | — |
Total debt — net carrying amount |  | $ | 122,235 |  |  | $ | 118,899 |
Schedule of Line of Credit Facility Debt and Key Terms | The following table provides a summary of the Company’s debt and key terms:
|  | Amount Due |  |  | Terms
|  | December 31, 2020 |  |  | December 31, 2019 |  |  | Annual Interest Rate |  |  | Maturity Date |  | Conversion Price
Mann Group convertible note |  | $28.0 million (plus $0.6 million accrued interest paid-in-kind) |  |  | $35.0 million (plus $1.0 million accrued interest paid-in-kind) |  |  | 7.00% |  |  | November 2024 |  | $2.50 per share
Mann Group non- convertible note |  | $35.1 million (plus $3.6 million accrued interest paid-in-kind) |  |  | $35.1 million (plus $1.0 million accrued interest paid-in-kind) |  |  | 7.00% |  |  | November 2024 |  | N/A
MidCap Credit Facility |  | $50.0 million |  |  | $40.0 million |  |  | one-month LIBOR (2% floor) plus 6.75% |  |  | August 2024 |  | N/A
2024 convertible notes |  | $5.0 million |  |  | $5.0 million |  |  | 5.75% |  |  | November 2024 |  | $3.00 per share
June 2020 note |  |  | — |  |  | $2.6 million |  |  |  | — |  |  | June 2020 |  | N/A
December 2020 note |  |  | — |  |  | $2.6 million |  |  |  | — |  |  | December 2020 |  | N/A
PPP Loan |  | $4.9 million |  |  |  | — |  |  | 0.98% |  |  | April 2022 |  | N/A
Schedule of Maturities of Our Borrowings | The maturities of our borrowings as of December 31, 2020 are as follows (in thousands):
| Amounts |
2021 |  | 4,061 |
2022 |  | 9,145 |
2023 |  | 25,000 |
2024 |  | 84,718 |
Total principal payments |  | 122,924 |
Unamortized discount |  | (665 | )
Debt issuance costs |  | (24 | )
Total debt | $ | 122,235 |
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, 2020 and 2019 are as follows (in thousands):
|  | Year Ended December 31, |
|  | 2020 |  |  | 2019 |
Amortization of debt premium |  | $ | — |  |  | $ | (1,049 | )
Amortization of debt discount |  |  | 268 |  |  |  | 295 |
Accretion expense — debt issuance cost |  |  | (101 | ) |  |  | (111 | )

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