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The following table summarizes information about the equity and liability components of the 2019 Notes and 2023 Notes (in thousands).
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September 30, 2018 |
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December 31, 2017 |
| Principal amount of 2019 Notes outstanding |
$ |
223,215 |
|
$ |
245,000 |
| Unamortized discount (including unamortized debt issuance cost) |
(10,071) |
|
(20,471) |
| Total current portion of notes payable |
$ |
213,144 |
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$ |
224,529 |
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| Principal amount of 2023 Notes outstanding |
$ |
750,000 |
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$ |
— |
| Unamortized discount (including unamortized debt issuance cost) |
(147,161) |
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— |
| Total long-term portion of notes payable |
$ |
602,839 |
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$ |
— |
| Carrying value of equity component of 2023 Notes |
$ |
143,986 |
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$ |
— |
| Fair value of convertible senior notes outstanding (Level 2) |
$ |
1,729,179 |
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$ |
446,360 |
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