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Borrowings (Tables) | 3 Months Ended
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Mar. 31, 2021
Debt Disclosure [Abstract] |
Summary of Carrying Amount of Principal Borrowings | Carrying amount of principal borrowings consist of the following (in thousands):
|  | March 31, 2021 |  |  | December 31, 2020 |
Senior convertible notes |  | $ | 222,855 |  |  | $ | — |
MidCap credit facility |  |  | 49,406 |  |  |  | 49,335 |
Mann Group promissory notes |  |  | 53,453 |  |  |  | 63,027 |
PPP loan |  |  | 4,873 |  |  |  | 4,873 |
2024 convertible notes |  |  | — |  |  |  | 5,000 |
Total debt — net carrying amount |  | $ | 330,587 |  |  | $ | 122,235 |
Schedule of Line of Credit Facility Debt and Key Terms | The following table provides a summary of the Company’s debt and key terms as of March 31, 2021:
|  | Amount Due |  |  | Terms
|  | March 31, 2021 |  |  | December 31, 2020 |  |  | Annual Interest Rate |  |  | Maturity Date |  | Conversion Price
Senior convertible notes |  | $230.0 million |  |  | $ | — |  |  | 2.50% |  |  | March 2026 |  | $5.21 per share
MidCap credit facility(1) |  | $50.0 million |  |  | $50.0 million |  |  | one-month LIBOR (2% floor) plus 6.75% |  |  | August 2024 |  | N/A
Mann Group convertible note |  | $18.4 million (plus $0.5 million accrued interest paid-in-kind) |  |  | $28.0 million (plus $0.6 million accrued interest paid-in-kind) |  |  | 7.00% |  |  | November 2024 |  | $2.50 per share
Mann Group non-convertible note(2) |  | $35.1 million (plus $4.3 million accrued interest paid-in-kind) |  |  | $35.1 million (plus $3.6 million accrued interest paid-in-kind) |  |  | 7.00% |  |  | November 2024 |  | N/A
PPP loan |  | $4.9 million |  |  | $4.9 million |  |  | 0.98% |  |  | April 2022 |  | N/A
2024 convertible notes(3) |  | $ | — |  |  | $5.0 million |  |  | 5.75% |  |  | November 2024 |  | $3.00 per share
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| (1) | Subsequent to March 31, 2021, $10.0 million of the outstanding principal amount was repaid.
| (2) | Subsequent to March 31, 2021, $35.1 million of the outstanding principal amount was repaid, together with all accrued and unpaid interest.
| (3) | In February 2021, the $5.0 million principal balance was converted into 1,666,667 shares of the Company’s common stock.
Schedule of Maturities of Our Borrowings | The maturities of our borrowings as of March 31, 2021 are as follows (in thousands):
|  | Amounts |
2021 |  | $ | 4,061 |
2022 |  |  | 9,145 |
2023 |  |  | 25,000 |
2024 |  |  | 70,142 |
Thereafter |  |  | 230,000 |
Total principal payments |  |  | 338,348 |
Unamortized discount |  |  | (594 | )
Unamortized debt issuance costs |  |  | (7,167 | )
Total debt — net carrying amount |  | $ | 330,587 |
Schedule of Accretion of Debt Discount and Amortization of Debt Issuance Costs | Accretion of debt discount and amortization of debt issuance costs related to all borrowings for the three months ended March 31, 2021 and 2020 are as follows (in thousands):
|  | Three Months Ended March 31, |
|  | 2021 |  |  | 2020 |
Accretion of debt discount |  | $ | 60 |  |  | $ | 89 |
Amortization of debt issuance cost |  |  | (124 | ) |  |  | (27 | )

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