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Borrowings (Tables) | 6 Months Ended
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Jun. 30, 2022
Debt Disclosure [Abstract] |
Summary of Carrying Amount of Principal Borrowings | Carrying amount of borrowings consist of the following (in thousands):
|  | June 30, 2022 |  |  | December 31, 2021 |
Senior convertible notes |  | $ | 224,670 |  |  | $ | 223,944 |
MidCap credit facility |  |  | 39,047 |  |  |  | 38,833 |
Mann Group convertible note |  |  | 8,829 |  |  |  | 18,425 |
Total debt — net carrying amount |  | $ | 272,546 |  |  | $ | 281,202 |
Schedule of Line of Credit Facility Debt and Key Terms | The following table provides a summary of the Company’s principal balance of debt and key terms:
|  | Amount Due |  | Terms
|  | June 30, 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 LIBOR (1% floor) plus 6.25% |  |  | (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.
(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 Our Borrowings | The maturities of the Company’s borrowings as of June 30, 2022 are as follows (in thousands):
|  | Amounts |
2022 |  | $ | — |
2023 |  |  | 6,667 |
2024 |  |  | 20,000 |
2025 |  |  | 22,163 |
Thereafter |  |  | 230,000 |
Total principal payments |  |  | 278,830 |
Unamortized discount |  |  | (954 | )
Debt issuance costs |  |  | (5,330 | )
Total debt — net carrying amount |  | $ | 272,546 |
Schedule of Amortization of Debt Premium and Accretion of Debt Discount and Debt Issuance Cost | Amortization of debt discount and debt issuance cost related to all borrowings for the three and six months ended June 30, 2022 and 2021 were as follows (in thousands):
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
Amortization of debt discount |  | $ | 106 |  |  | $ | 86 |  |  | $ | 212 |  |  | $ | 146 |
Amortization of debt issuance cost |  |  | 363 |  |  |  | 363 |  |  |  | 726 |  |  |  | 488 |

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