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Borrowings (Tables) | 12 Months Ended
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Dec. 31, 2021
Debt Disclosure [Abstract] |
Summary of Carrying Amount of Borrowings | Carrying amount of borrowings consist of the following (in thousands):
|  | December 31, |
|  | 2021 |  |  | 2020 |
Senior convertible notes |  | $ | 223,944 |  |  | $ | — |
Mann Group promissory notes(1) |  |  | 18,425 |  |  |  | 63,027 |
MidCap credit facility |  |  | 38,833 |  |  |  | 49,335 |
2024 convertible notes |  |  | — |  |  |  | 5,000 |
PPP Loan |  |  | — |  |  |  | 4,873 |
Total debt — net carrying amount |  | $ | 281,202 |  |  | $ | 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:
|  | Amount Due |  |  | Terms
|  | December 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) |  | $40.0 million |  |  | $50.0 million |  |  | one-month LIBOR (1% floor) plus 6.25% |  | (1) | August 2025 | (1) | N/A
Mann Group convertible note |  | $18.4 million (plus $0.4 million accrued interest paid-in-kind) |  |  | $28.0 million (plus $0.6 million accrued interest paid-in-kind) |  |  | 2.50% |  | (2) | December 2025 | (2) | $2.50 per share
Mann Group non-convertible note(3) |  |  | — |  |  | $35.1 million (plus $3.6 million accrued interest paid-in-kind) |  |  | 7.00% |  |  | November 2024 |  | N/A
PPP loan(4) |  |  | — |  |  | $4.9 million |  |  | 0.98% |  |  | April 2022 |  | N/A
2024 convertible notes(5) |  |  | — |  |  | $5.0 million |  |  | 5.75% |  |  | November 2024 |  | $3.00 per share
Schedule of Maturities of Our Borrowings | The maturities of our borrowings as of December 31, 2021 are as follows (in thousands):
| Amounts |
2022 | $ | — |
2023 |  | 6,667 |
2024 |  | 20,000 |
2025 |  | 31,758 |
Thereafter |  | 230,000 |
Total principal payments |  | 288,425 |
Unamortized discount |  | (1,167 | )
Debt issuance costs |  | (6,056 | )
Total debt | $ | 281,202 |
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, 2021 and 2020 are as follows (in thousands):
|  | Year Ended December 31, |
|  | 2021 |  |  | 2020 |
Amortization of debt discount |  |  | 377 |  |  |  | 268 |
Amortization of debt issuance cost |  |  | 1,215 |  |  |  | 101 |

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