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0.25% Convertible Senior Notes, Convertible Note Hedge and Warrant (Tables) | 9 Months Ended
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Sep. 30, 2017
Debt Instrument [Line Items] |
Schedule of Interest Expense | Interest expense related to the 2022 Notes is as follows:
| Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
| 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
| (in thousands) |  |  | (in thousands) |
Contractual interest expense | $ | 250 |  |  | $ | — |  |  | $ | 390 |  |  | $ | — |
Amortization of debt discount |  | 4,465 |  |  |  | — |  |  |  | 6,963 |  |  |  | — |
Amortization of issuance costs |  | 334 |  |  |  | — |  |  |  | 519 |  |  |  | — |
Total interest expense | $ | 5,049 |  |  | $ | — |  |  | $ | 7,872 |  |  | $ | — |
Schedule of Net Equity Impact, Included in Additional Paid-in Capital, of the Liability and Equity Components | The net equity impact, included in additional paid-in capital, of the above components of the 2022 Notes is as follows:
| (in thousands) |
Conversion Option | $ | 106,006 |
Purchase of Convertible Note Hedges |  | (78,920 | )
Sales of warrants |  | 59,080 |
Issuance costs |  | (3,054 | )
Deferred tax liability |  | (9,399 | )
Total | $ | 73,713 |
0.25% Convertible Senior Notes Due 2022 as Liability Component [Member] |
Debt Instrument [Line Items] |
Schedule of Net Carrying Amount of Notes | The net carrying amount of the liability component of the 2022 Notes is as follows:
| As of September 30, 2017 |  |  | As of December 31, 2016 |
| (in thousands) |
Principal | $ | 400,000 |  |  | $ | — |
Unamortized debt discount |  | (99,042 | ) |  |  | — |
Unamortized issuance costs |  | (7,395 | ) |  |  | — |
Net carrying amount | $ | 293,563 |  |  | $ | — |
0.25% Convertible Senior Notes Due 2022 as Equity Component [Member] |
Debt Instrument [Line Items] |
Schedule of Net Carrying Amount of Notes | The net carrying amount of the equity component of the 2022 Notes is as follows:
| As of September 30, 2017 |  |  | As of December 31, 2016 |
| (in thousands) |
Debt discount for conversion option | $ | 106,006 |  |  |  | — |
Issuance costs |  | (2,854 | ) |  |  | — |
Net carrying amount | $ | 103,152 |  |  | $ | — |

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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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