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Debt (Tables) | 6 Months Ended
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Jun. 30, 2022
Debt Disclosure [Abstract] |
Schedule of Net Carrying Amount of Debt | The 2025 Notes consist of the following (in thousands):
| June 30, 2022 |  | December 31, 2021 |  |
Principal | $ | 161,898 |  |  | $ | 161,898 |  |  |
Add: fair value of embedded derivative | 24 |  |  | 926 |  |  |
Less: unamortized debt discount | (2,346) |  |  | (2,761) |  |  |
Less: unamortized issuance costs | (1,868) |  |  | (2,197) |  |  |
Net carrying amount | $ | 157,708 |  |  | $ | 157,866 |  |  |
Schedule of Interest Expense | The following table sets forth total interest expense recognized related to the 2025 Notes (in thousands):
| Three Months Ended June 30, |  | Six Months Ended June 30, |  |  |
| 2022 |  | 2021 |  | 2022 |  | 2021 |  |  |  |
Contractual interest expense | $ | 1,315 |  |  | $ | 1,315 |  |  | $ | 2,631 |  |  | $ | 2,584 |  |  |  |  |
Amortization of debt discount | 207 |  |  | 207 |  |  | 414 |  |  | 415 |  |  |  |  |
Amortization of debt issuance costs | 165 |  |  | 165 |  |  | 330 |  |  | 330 |  |  |  |  |
Total interest expense | $ | 1,687 |  |  | $ | 1,687 |  |  | $ | 3,375 |  |  | $ | 3,329 |  |  |  |  |

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