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Convertible Senior Notes and Capped Call Transactions (Tables) | 6 Months Ended
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Jun. 30, 2021
Debt Disclosure [Abstract] |
Schedule of Carrying Amount of Liability Component of Convertible Debt | The net carrying amount of the liability component of the Notes was as follows:
| June 30, 2021 |  | December 31, 2020
| (In thousands)
Principal | $ | 747,500 |  |  | $ | 747,500 |
Unamortized discount | (179,896) |  |  | (196,269) |
Unamortized issuance costs | (11,572) |  |  | (12,799) |
Net carrying amount | $ | 556,032 |  |  | $ | 538,432 |
Schedule of Carrying Amount of Equity Component of Convertible Debt | The net carrying amount of the equity component of the Notes was as follows:
| June 30, 2021
| (In thousands)
Proceeds allocated to the conversion options (debt discount) | $ | 215,434 |
Issuance costs | (5,783) |
Net carrying amount | $ | 209,651 |
Schedule of Interest Expense Incurred | The following table sets forth the interest expense recognized related to the Notes:
| Three Months Ended |  | Six Months Ended
| June 30, |  | June 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
| (In thousands)
Contractual interest expense | $ | 432 |  |  | $ | 431 |  |  | $ | 863 |  |  | $ | 863 |
Amortization of issuance costs | 619 |  |  | 303 |  |  | 1,228 |  |  | 600 |
Amortization of debt discount | 8,256 |  |  | 2,409 |  |  | 16,374 |  |  | 4,776 |
Total interest expense | $ | 9,307 |  |  | $ | 3,143 |  |  | $ | 18,465 |  |  | $ | 6,239 |

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- Definition Tabular disclosure of borrowings which can be exchanged for a specified number of another security at the option of the issuer or the holder. Disclosures include, but are not limited to, principal amount, amortized premium or discount, and amount of liability and equity components. + References No definition available. + Details
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