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Convertible Senior Notes (Tables) | 9 Months Ended
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Sep. 30, 2021
Debt Disclosure [Abstract] |
Summary of Convertible Debt | The net carrying amount of the liability and equity components of the Notes was as follows (in thousands):
| September 30, 2021 |  | December 31, 2020
Liability component: |  |  |
Principal | $ | 345,000 |  |  | $ | 345,000 |
Unamortized discount | (43,255) |  |  | (49,346) |
Unamortized issuance costs | (5,404) |  |  | (6,164) |
Net carrying amount | $ | 296,341 |  |  | $ | 289,490 |
Equity component, net of purchase discounts and issuance costs | $ | 58,560 |  |  | $ | 58,560 |
Interest expense related to the Notes is as follows (in thousands):
| Three months ended September 30, |  | Nine months ended September 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Contractual interest expense | $ | 970 |  |  | $ | 970 |  |  | $ | 2,911 |  |  | $ | 2,910 |
Amortization of debt discount | 2,045 |  |  | 1,983 |  |  | 6,091 |  |  | 5,903 |
Amortization of issuance costs | 256 |  |  | 248 |  |  | 760 |  |  | 738 |
Total interest expense | $ | 3,271 |  |  | $ | 3,201 |  |  | $ | 9,762 |  |  | $ | 9,551 |

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- Definition Tabular disclosure of convertible debt instrument. Includes, but is not limited to, principal amount and amortized premium or discount. + References No definition available. + Details
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- References No definition available. + Details
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