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Debt (Tables) | 3 Months Ended
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Mar. 31, 2022
Debt Disclosure [Abstract] |
Schedule of Convertible Debt | The net carrying amounts of the Notes were as follows:
| March 31, 2022 |  | December 31, 2021
| 2026 Notes | 2025 Notes |  | 2026 Notes | 2025 Notes
| (in thousands)
Principal | $ | 1,293,750 |  | $ | 158,429 |  |  | $ | 1,293,750 |  | $ | 175,000 |
Unamortized debt discount(1) | — |  | — |  |  | (248,179) |  | (45,382) |
Unamortized debt issuance costs | (17,316) |  | (2,158) |  |  | (14,541) |  | (1,654) |
Carrying amount, net | $ | 1,276,434 |  | $ | 156,271 |  |  | $ | 1,031,030 |  | $ | 127,964 |
(1)The carrying value of the equity components of the 2025 Notes and 2026 Notes as of December 31, 2021 was eliminated upon the adoption of ASU 2020-06. Refer to Note 2 to these condensed consolidated financial statements.
Schedule of Interest Expense | The following table sets forth total interest expense recognized related to the Notes:
| Three Months Ended March 31, |  |
| 2022 |  | 2021 |  |  |  |
| 2026 Notes | 2025 Notes |  | 2026 Notes | 2025 Notes |  |  |  |
| (in thousands)
Coupon interest expense | $ | — |  | $ | 310 |  |  | $ | — |  | $ | 1,078 |  |  |  |  |
Amortization of debt discount(1) | — |  | — |  |  | — |  | 8,568 |  |  |  |  |
Amortization of debt issuance costs | 990 |  | 180 |  |  | — |  | 403 |  |  |  |  |
Total | $ | 990 |  | $ | 490 |  |  | $ | — |  | $ | 10,049 |  |  |  |  |
(1)As a result of the adoption of ASU 2020-06 on January 1, 2022, there is no debt discount associated with either the 2025 Notes or the 2026 Notes. Refer to Note 2 to these condensed consolidated financial statements.

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