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Convertible Senior Notes (Tables) | 9 Months Ended
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Sep. 30, 2021
Debt Disclosure [Abstract] |
Convertible Debt Balances | The Notes consisted of the following balances reported in the Condensed Consolidated Balance Sheets as of September 30, 2021 and December 31, 2020:
| September 30, 2021 |  | December 31, 2020
| (In thousands)
Liability: |  |  |
Principal amount | $ | 575,000 |  |  | $ | 575,000 |
Unamortized discount | (81,870) |  |  | (95,744) |
Unamortized debt issuance costs | (10,308) |  |  | (12,055) |
Convertible senior notes, liability component | $ | 482,822 |  |  | $ | 467,201 |
Convertible senior notes, equity component (1) | $ | 72,732 |  |  | $ | 72,732 |
_________________________________________________ (1) Included in additional paid-in capital in the Condensed Consolidated Balance Sheets.
Summary of Components of Interest Expense | The following table summarizes the components of interest expense resulting from the Notes recognized in interest and other income (expense), net in the Condensed Consolidated Statements of Operations for the three and nine months ended September 30, 2021:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
| (In thousands)
Contractual coupon interest | $ | 359 |  |  | $ | 20 |  |  | $ | 1,078 |  |  | $ | 20 |
Amortization of discount | $ | 4,679 |  |  | $ | 249 |  |  | $ | 13,874 |  |  | $ | 249 |
Amortization of debt issuance costs | $ | 589 |  |  | $ | 31 |  |  | $ | 1,747 |  |  | $ | 31 |

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