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Convertible Senior Notes (Tables) | 6 Months Ended
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Jun. 30, 2022
Debt Disclosure [Abstract] |
Summary of Notes Net of Discount and Deferred Financing Costs | The following table presents a summary of the 2024 Notes as of June 30, 2022.
| Principal Amount |  | Unamortized Debt |  | Net Carrying Amount (1) |  | Fair Value
(in millions) |  | Discount |  | Issuance Costs |  |  | Amount |  | Leveling
2024 Notes | $ | 170.4 |  |  | $ | — |  |  | $ | (1.4) |  |  | $ | 169.0 |  |  | $ | 224.8 |  |  | Level 2
_________________________ (1) While the 2024 Notes were classified as a long-term liability as of June 30, 2022, the future convertibility and associated balance sheet classification will be monitored at each quarterly reporting date and determined based on the market prices of our common stock during the prescribed measurement period. In the event that we have the election to redeem the 2024 Notes or the holders of the 2024 Notes have the election to convert the 2024 Notes at any time during the prescribed measurement period, the 2024 Notes would be classified as a current obligation. The following table presents a summary of the 2024 Notes as of December 31, 2021.
| Principal Amount |  | Unamortized Debt |  | Net Carrying Amount |  | Fair Value
(in millions) |  | Discount |  | Issuance Costs |  |  | Amount |  | Leveling
2024 Notes | $ | 381.2 |  |  | $ | (43.2) |  |  | $ | (2.9) |  |  | $ | 335.1 |  |  | $ | 464.7 |  |  | Level 2
The following table presents a summary of the interest expense of the 2024 Notes.
| Three Months Ended June 30, |  | Six Months Ended June 30,
(in millions) | 2022 |  | 2021 |  | 2022 |  | 2021
Coupon interest | $ | 1.8 |  |  | $ | 1.9 |  |  | $ | 4.0 |  |  | $ | 4.1 |
Amortization of debt discount and issuance costs | 0.4 |  |  | 4.3 |  |  | 0.8 |  |  | 8.5 |
Total | $ | 2.2 |  |  | $ | 6.2 |  |  | $ | 4.8 |  |  | $ | 12.6 |

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