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Borrowings (Tables) | 12 Months Ended
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Dec. 31, 2022
Debt Disclosure [Abstract] |
Summary of Carrying Amount of Borrowings | Carrying amount of the Company’s borrowings consist of the following (in thousands):
|  | December 31, |
|  | 2022 |  |  | 2021 |
Senior convertible notes |  | $ | 225,397 |  |  | $ | 223,944 |
Mann Group promissory notes(1) |  |  | 8,829 |  |  |  | 18,425 |
MidCap credit facility |  |  | 39,264 |  |  |  | 38,833 |
Total debt — net carrying amount |  | $ | 273,490 |  |  | $ | 281,202 |
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, 2022 |  | December 31, 2021 |  | Annual Interest Rate |  |  |  |  | Maturity Date |  |  |  | Conversion Price
Senior convertible notes |  | $230.0 million |  | $230.0 million |  | 2.50% |  |  |  |  | March 2026 |  |  |  | $5.21 per share
MidCap credit facility(1) |  | $40.0 million |  | $40.0 million |  | one-month SOFR (1% floor) plus 6.25%; cap of 8.25% |  |  | (1 | ) | August 2025 |  | (1 | ) | N/A
Mann Group convertible note |  | $8.8 million |  | $18.4 million (plus $0.4 million accrued interest paid-in-kind) |  | 2.50% |  |  | (2 | ) | December 2025 |  | (2 | ) | $2.50 per share
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(1) | In April 2021, the Company prepaid $10.0 million principal balance and amended the MidCap credit facility. The interest rate prior to the amendment was one-month LIBOR (2% floor) plus 6.75% and the maturity date was in August 2024. In August 2022, the Company amended the MidCap credit facility and transitioned to the benchmark interest rate from LIBOR to the Secured Overnight Financing Rate (“SOFR”). The interest rate prior to the amendment was one-month LIBOR (1% floor) plus 6.25% (cap of 8.25%).
(2) | In April 2021, the Mann Group convertible note was amended. The interest rate prior to the amendment was 7.00% and the maturity date was in November 2024.
Schedule of Maturities of the Company's Borrowings | The maturities of the Company’s borrowings as of December 31, 2022 are as follows (in thousands):
| Amounts |
2023 | $ | 6,667 |
2024 |  | 20,000 |
2025 |  | 22,163 |
2026 |  | 230,000 |
Total principal payments |  | 278,830 |
Unamortized discount |  | (235 | )
Debt issuance costs |  | (5,105 | )
Total debt | $ | 273,490 |
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, 2022, 2021 and 2020 are as follows (in thousands):
|  | Year Ended December 31, |
|  | 2022 |  |  | 2021 |  |  | 2020 |
Amortization of debt discount |  | $ | 431 |  |  | $ | 377 |  |  | $ | 268 |
Amortization of debt issuance cost |  |  | 1,453 |  |  |  | 1,215 |  |  |  | 101 |

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