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Convertible Senior Notes (Tables) | 3 Months Ended
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Mar. 31, 2020
Debt Disclosure [Abstract] |
Schedule of Long-term Debt Instruments | The total net proceeds from the notes are as follows (in thousands):
| 2025 Notes |  | 2023 Notes
Principal amount | $ | 800,000 |  |  | $ | 345,000 |
Less initial purchasers’ discount | (18,998 | ) |  | (8,625 | )
Less other issuance costs | (822 | ) |  | (757 | )
Net proceeds | $ | 780,180 |  |  | $ | 335,618 |
Schedule of Debt | The net carrying amount of the liability component of the notes is as follows (in thousands):
| March 31, 2020 |  | December 31, 2019
| 2025 Notes |  | 2023 Notes |  | 2025 Notes |  | 2023 Notes
Principal | $ | 800,000 |  |  | $ | 345,000 |  |  | $ | 800,000 |  |  | $ | 345,000 |
Unamortized debt discount | (175,857 | ) |  | (39,155 | ) |  | (184,698 | ) |  | (42,280 | )
Unamortized issuance costs | (12,084 | ) |  | (4,655 | ) |  | (12,691 | ) |  | (5,028 | )
Net carrying amount (liability) | $ | 612,059 |  |  | $ | 301,190 |  |  | $ | 602,611 |  |  | $ | 297,692 |
The net carrying amount of the equity component of the notes is as follows (in thousands):
| March 31, 2020 |  | December 31, 2019
| 2025 Notes |  | 2023 Notes |  | 2025 Notes |  | 2023 Notes
Debt discount for conversion option | $ | 212,000 |  |  | $ | 64,193 |  |  | $ | 212,000 |  |  | $ | 64,193 |
Issuance costs | (5,253 | ) |  | (1,749 | ) |  | (5,253 | ) |  | (1,749 | )
Net carrying amount (equity) | $ | 206,747 |  |  | $ | 62,444 |  |  | $ | 206,747 |  |  | $ | 62,444 |
Schedule Of Interest Expense Recognized | The following table sets forth the total interest expense recognized related to the notes (in thousands):
| Three Months Ended March 31,
| 2020 |  | 2019
| 2025 Notes |  | 2023 Notes |  | 2025 Notes |  | 2023 Notes
Contractual interest expense | $ | 249 |  |  | $ | 215 |  |  | $ | 14 |  |  | $ | 213 |
Amortization of debt discount | 8,841 |  |  | 3,125 |  |  | 510 |  |  | 3,091 |
Amortization of issuance costs | 608 |  |  | 372 |  |  | 35 |  |  | 369 |
Total interest expense | $ | 9,698 |  |  | $ | 3,712 |  |  | $ | 559 |  |  | $ | 3,673 |

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