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Debt (Tables) | 6 Months Ended
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Jun. 30, 2020
Debt Disclosure [Abstract] |
Components of Debt Balance | The following table presents the carrying value of the Company's debt balance (in thousands):
| June 30, 2020 |  | December 31, 2019
1.75% convertible senior notes due 2025 | $ | 450,000 |  |  | $ | 450,000 |
Debt issuance costs, unamortized | (6,345) |  |  | (7,043) |
Discount on debt | (97,654) |  |  | (107,017) |
Debt, long-term | $ | 346,001 |  |  | $ | 335,940 |
Schedule of Future Principal Repayments of Debt | As of June 30, 2020, future principal repayments of the debt for each of the fiscal years through maturity were as follows (in thousands):
Year Ending December 31: |
2020 | $ | — |
2021 | — |
2022 | — |
2023 | — |
2024 | — |
2025 | 450,000 |
| $ | 450,000 |
Summary of Interest Expense | Interest expense related to the Convertible Notes for the three and six months ended June 30, 2020 and June 30, 2019, which includes the contractual interest coupon payable semi-annually in cash, the amortization of the issuance costs, accretion of debt discount and finance lease interest expense is as follows (in thousands):
| Three Months Ended June 30, |  |  |  | Six Months Ended June 30, |  |
| 2020 |  | 2019 |  | 2020 |  | 2019
Contractual interest expense | $ | 1,975 |  |  | $ | 1,970 |  |  | $ | 3,948 |  |  | $ | 3,941 |
Amortization of debt issuance costs | 349 |  |  | 349 |  |  | 698 |  |  | 698 |
Accretion of debt discount | 4,713 |  |  | 4,466 |  |  | 9,363 |  |  | 8,872 |
Total convertible debt interest expense | 7,037 |  |  | 6,785 |  |  | 14,009 |  |  | 13,511 |
Finance lease interest expense | 432 |  |  | — |  |  | 871 |  |  | — |
Total interest expense | $ | 7,469 |  |  | $ | 6,785 |  |  | $ | 14,880 |  |  | $ | 13,511 |

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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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