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v3.20.2

Convertible Senior Notes (Tables) | 9 Months Ended
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Sep. 30, 2020
Debt Disclosure [Abstract] |
Schedule of Long-term Debt Instruments | The total net proceeds from the notes are as follows (in thousands):
| 2026 Notes |  | 2025 Notes |  | 2023 Notes
Principal amount | $ | 1,000,000 |  |  | $ | 800,000 |  |  | $ | 345,000 |
Less initial purchasers’ discount | (15,000) |  |  | (18,998) |  |  | (8,625) |
Less other issuance costs | (904) |  |  | (822) |  |  | (757) |
Net proceeds | $ | 984,096 |  |  | $ | 780,180 |  |  | $ | 335,618 |
Schedule of Debt | The net carrying amount of the liability component of the notes is as follows (in thousands):
| September 30, 2020 |  |  |  |  |  | December 31, 2019 |  |
| 2026 Notes |  | 2025 Notes |  | 2023 Notes |  | 2025 Notes |  | 2023 Notes
Principal | $ | 1,000,000 |  |  | $ | 800,000 |  |  | $ | 173,018 |  |  | $ | 800,000 |  |  | $ | 345,000 |
Unamortized debt discount | (236,809) |  |  | (158,077) |  |  | (16,484) |  |  | (184,698) |  |  | (42,280) |
Unamortized issuance costs | (11,842) |  |  | (10,862) |  |  | (1,960) |  |  | (12,691) |  |  | (5,028) |
Net carrying amount (liability) | $ | 751,349 |  |  | $ | 631,061 |  |  | $ | 154,574 |  |  | $ | 602,611 |  |  | $ | 297,692 |
The net carrying amount of the equity component of the notes is as follows (in thousands):
| September 30, 2020 |  |  |  |  |  | December 31, 2019 |  |
| 2026 Notes |  | 2025 Notes |  | 2023 Notes |  | 2025 Notes |  | 2023 Notes
Debt discount for conversion option | $ | 241,300 |  |  | $ | 212,000 |  |  | $ | 32,193 |  |  | $ | 212,000 |  |  | $ | 64,193 |
Issuance costs | (3,838) |  |  | (5,253) |  |  | (877) |  |  | (5,253) |  |  | (1,749) |
Net carrying amount (equity) | $ | 237,462 |  |  | $ | 206,747 |  |  | $ | 31,316 |  |  | $ | 206,747 |  |  | $ | 62,444 |
Schedule Of Interest Expense Recognized | The following tables set forth the total interest expense recognized related to the notes (in thousands):
| Three Months Ended September 30, |  |  |  |  |  |  |  |
| 2020 |  |  |  |  |  | 2019 |  |
| 2026 Notes |  | 2025 Notes |  | 2023 Notes |  | 2025 Notes |  | 2023 Notes
Contractual interest expense | $ | — |  |  | $ | 252 |  |  | $ | 169 |  |  | $ | 252 |  |  | $ | 217 |
Amortization of debt discount | 4,491 |  |  | 8,938 |  |  | 2,458 |  |  | 8,939 |  |  | 3,161 |
Amortization of issuance costs | 225 |  |  | 614 |  |  | 292 |  |  | 614 |  |  | 375 |
Total interest expense | $ | 4,716 |  |  | $ | 9,804 |  |  | $ | 2,919 |  |  | $ | 9,805 |  |  | $ | 3,753 |
| Nine Months Ended September 30, |  |  |  |  |  |  |  |
| 2020 |  |  |  |  |  | 2019 |  |
| 2026 Notes |  | 2025 Notes |  | 2023 Notes |  | 2025 Notes |  | 2023 Notes
Contractual interest expense | $ | — |  |  | $ | 750 |  |  | $ | 599 |  |  | $ | 517 |  |  | $ | 645 |
Amortization of debt discount | 4,491 |  |  | 26,621 |  |  | 8,709 |  |  | 18,363 |  |  | 9,377 |
Amortization of issuance costs | 225 |  |  | 1,829 |  |  | 1,035 |  |  | 1,262 |  |  | 1,112 |
Total interest expense | $ | 4,716 |  |  | $ | 29,200 |  |  | $ | 10,343 |  |  | $ | 20,142 |  |  | $ | 11,134 |

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