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Debt (Tables) | 12 Months Ended
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Dec. 31, 2018
Debt Disclosure [Abstract] |
Components of Debt Balance | The following table presents the carrying value of the Company’s debt balance as of December 31, 2018 (in thousands):
| As of December 31, 2018
1.75% convertible senior notes due 2025 | $ | 450,000 |
Debt issuance costs, unamortized | (8,440 | )
Discount on debt | (125,002 | )
Long-term debt, net | $ | 316,558 |
Schedule of Future Principal Repayments of Debt | As of December 31, 2018, future principal repayments of the debt for each of the fiscal years through maturity were as follows (in thousands):
Year Ending December 31: |  |
2019 | $ | — |
2020 | — |
2021 | — |
2022 | — |
2023 and thereafter | 450,000 |
| $ | 450,000 |

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- Definition Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. + References No definition available. + Details
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- Definition Tabular disclosure of the combined aggregate amount of maturities and sinking fund requirements for all long-term borrowings for each of the five years following the date of the latest balance sheet date presented. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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