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Debt (Tables) | 9 Months Ended
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Sep. 30, 2021
Debt Disclosure [Abstract] |
Schedule of Net Carrying Amount of Debt | The 2025 Notes consist of the following (in thousands):
| September 30, 2021 |  | December 31, 2020 |  |
Liability component |  |  |  |  |
Principal | $ | 161,898 |  |  | $ | 166,898 |  |  |
Add: fair value of embedded derivative | 1,317 |  |  | 4,898 |  |  |
Less: unamortized debt discount | (2,972) |  |  | (3,703) |  |  |
Less: unamortized issuance costs | (2,364) |  |  | (2,946) |  |  |
Net carrying amount | $ | 157,879 |  |  | $ | 165,147 |  |  |
Schedule of Interest Expense | The following table sets forth total interest expense recognized related to the Term Loan (in thousands):
|  |  | Three Months Ended September 30, |  | Nine Months Ended September 30, |  |
|  |  | 2021 |  | 2020 |  | 2021 |  | 2020 |  |  |  |
Contractual interest expense |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 1,667 |  |  |  |  |
Amortization of debt discount |  |  | — |  |  | — |  |  | — |  |  | 859 |  |  |  |  |
Amortization of debt issuance costs |  |  | — |  |  | — |  |  | — |  |  | 103 |  |  |  |  |
Total interest expense |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 2,629 |  |  |  |  |
The following table sets forth total interest expense recognized related to the 2025 Notes (in thousands):
|  | Three Months Ended September 30, |  | Nine Months Ended September 30, |  |  |
|  | 2021 |  | 2020 |  | 2021 |  | 2020 |  |  |  |
Contractual interest expense |  | $ | 1,315 |  |  | $ | 1,278 |  |  | $ | 3,899 |  |  | $ | 2,078 |  |  |  |  |
Amortization of debt discount |  | 207 |  |  | 217 |  |  | 622 |  |  | 341 |  |  |  |  |
Amortization of debt issuance costs |  | 165 |  |  | 172 |  |  | 495 |  |  | 268 |  |  |  |  |
Total interest expense |  | $ | 1,687 |  |  | $ | 1,667 |  |  | $ | 5,016 |  |  | $ | 2,687 |  |  |  |  |
The following table sets forth total interest expense recognized related to the 2022 Notes (in thousands):
|  |  | Three Months Ended September 30, |  | Nine Months Ended September 30, |  |
|  |  | 2021 |  | 2020 |  | 2021 |  | 2020 |  |  |  |
Contractual interest expense |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 768 |  |  |  |  |
Amortization of debt discount |  |  | — |  |  | — |  |  | — |  |  | 1,952 |  |  |  |  |
Amortization of debt issuance costs |  |  | — |  |  | — |  |  | — |  |  | 111 |  |  |  |  |
Total interest expense |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 2,831 |  |  |  |  |

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