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Debt (Tables) | 9 Months Ended
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Sep. 30, 2020
Debt Disclosure [Abstract] |
Schedule of Liability and Equity Components of Convertible Debt | The following table presents details of the Notes (number of shares in millions):
| Initial Conversion Price per $1,000 Principal |  | Initial Conversion Price |  | Initial Number of Shares
2023 Notes | 24.0460 |  | $ | 41.59 |  |  | 5.5
2025 Notes | 16.3875 |  | $ | 61.02 |  |  | 3.8
The net carrying amounts of the liability components of the 2023 Notes and the 2025 Notes were as follows (in thousands):
|  | As of September 30, 2020 |  | As of December 31, 2019
|  | 2023 Notes |  | 2025 Notes |  | Total |  | 2023 Notes
Principal |  | $ | 230,000 |  |  | $ | 230,000 |  |  | $ | 460,000 |  |  | $ | 230,000 |
Unamortized debt discount |  | (33,101) |  |  | (45,012) |  |  | (78,113) |  |  | (40,768) |
Unamortized issuance costs |  | (3,274) |  |  | (5,295) |  |  | (8,569) |  |  | (4,032) |
Net carrying amount |  | $ | 193,625 |  |  | $ | 179,693 |  |  | $ | 373,318 |  |  | $ | 185,200 |
The net carrying amount of the equity component as of September 30, 2020 and December 31, 2019 (for the 2023 Notes only) was as follows (in thousands):
|  | 2023 Notes |  | 2025 Notes |  | Total
Debt discount for conversion option |  | $ | 53,820 |  |  | $ | 48,346 |  |  | $ | 102,166 |
Issuance costs |  | (1,626) |  |  | (1,514) |  |  | (3,140) |
Net carrying amount |  | $ | 52,194 |  |  | $ | 46,832 |  |  | $ | 99,026 |
Interest expense related to the 2023 Notes and the 2025 Notes was as follows (in thousands):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2020 |  | 2019 |  | 2020 |  | 2019
| 2023 |  | 2025 |  |  |  | 2023 |  | 2025 |  |  |  | 2023 |  | 2025 |  |  |  | 2023 |  | 2025 |  |
| Notes |  | Notes |  | Total |  | Notes |  | Notes |  | Total |  | Notes |  | Notes |  | Total |  | Notes |  | Notes |  | Total
Contractual interest expense | $ | 718 |  |  | $ | 1,293 |  |  | $ | 2,011 |  |  | $ | 719 |  |  | $ | — |  |  | $ | 719 |  |  | $ | 2,156 |  |  | $ | 2,156 |  |  | $ | 4,312 |  |  | $ | 2,156 |  |  | $ | — |  |  | $ | 2,156 |
Amortization of debt discount | 2,627 |  |  | 2,041 |  |  | 4,668 |  |  | 2,437 |  |  | — |  |  | 2,437 |  |  | 7,666 |  |  | 3,334 |  |  | 11,000 |  |  | 7,082 |  |  | — |  |  | 7,082 |
Amortization of issuance costs | 260 |  |  | 241 |  |  | 501 |  |  | 242 |  |  | — |  |  | 242 |  |  | 758 |  |  | 393 |  |  | 1,151 |  |  | 701 |  |  | — |  |  | 701 |
Total interest expense | $ | 3,605 |  |  | $ | 3,575 |  |  | $ | 7,180 |  |  | $ | 3,398 |  |  | $ | — |  |  | $ | 3,398 |  |  | $ | 10,580 |  |  | $ | 5,883 |  |  | $ | 16,463 |  |  | $ | 9,939 |  |  | $ | — |  |  | $ | 9,939 |
The net impact to our stockholders' equity, included in additional paid-in capital, of the above components of the 2023 Notes and the 2025 Notes was as follows (in thousands):
|  | 2023 Notes |  | 2025 Notes
Conversion option |  | $ | 53,820 |  |  | $ | 48,346 |
Purchase of capped calls |  | (26,910) |  |  | (27,255) |
Issuance costs |  | (1,626) |  |  | (1,514) |
Total |  | $ | 25,284 |  |  | $ | 19,577 |

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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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- References No definition available. + Details
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