v3.20.2

Convertible Senior Notes (Tables) | 6 Months Ended
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Jun. 30, 2020
Convertible Notes Payable [Abstract] |
Summary of Convertible Senior Notes |
| Convertible Date |  | Initial Conversion Price per Share |  | Initial Conversion Rate per $1,000 Par Value |  | Initial Number of Shares
2022 Notes | February 1, 2022 |  | $ | 134.75 |  |  | 7.42 shares |  | 5,807 |
The 2022 Notes consisted of the following (in thousands):
| June 30, 2020 |  | December 31, 2019
Liability component: |  |  |
Principal | $ | 764,778 |  |  | $ | 782,491 |
Less: debt issuance cost and debt discount, net of amortization | (68,655) |  |  | (87,510) |
Net carrying amount | $ | 696,123 |  |  | $ | 694,981 |
| 2022 Notes |  |
Equity component recorded at issuance: |  |  |
Note | $ | 162,039 |  |  |
Issuance cost | (2,148) |  |  |
Net amount recorded in equity | $ | 159,891 |  |  |
Schedule of Estimated Fair Values of Convertible Senior Notes | he estimated fair value of the 2022 Notes at June 30, 2020 and December 31, 2019 based on the closing trading price per $100 of the 2022 Notes was as follows (in thousands):
| June 30, 2020 |  | December 31, 2019
2022 Notes | $ | 2,244,623 |  |  | $ | 1,645,970 |
Schedule of Interest Expense Related to Convertible Senior Notes | As of June 30, 2020, the remaining life of the 2022 Notes is 23 months. The following table sets forth total interest expense recognized related to the 2022 Notes (in thousands):
| Three Months Ended June 30, |  |  |  | Six Months Ended June 30, |  |
| 2020 |  | 2019 |  | 2020 |  | 2019
Amortization of debt issuance cost | $ | 410 |  |  | $ | 398 |  |  | $ | 823 |  |  | $ | 792 |
Amortization of debt discount | 8,078 |  |  | 7,871 |  |  | 16,235 |  |  | 15,645 |
Total | $ | 8,488 |  |  | $ | 8,269 |  |  | $ | 17,058 |  |  | $ | 16,437 |
Effective interest rate of the liability component | 4.75% |  |  |  |  |  |
Schedule of Note Hedges |
| Purchase |  | Initial Shares |  | Shares as of June 30, 2020
| (in thousands) |  |  |  |
2022 Note Hedge | $ | 128,017 |  |  | 5,807 |  |  | 5,675 |
Schedule of Warrants |
| Proceeds |  | Initial Shares |  | Strike Price |  | First Expiration Date |  | Shares as of June 30, 2020
| (in thousands) |  | (in thousands) |  |  |  |  |  | (in thousands)
2022 Warrants | $ | 54,071 |  |  | 5,807 |  |  | $ | 203.40 |  |  | September 1, 2022 |  | 5,807 |

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