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Debt (Tables) | 9 Months Ended
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Sep. 30, 2020
Debt Disclosure [Abstract] |
Schedule of Net Carrying Amount of Debt | The Term Loan consisted of the following (in thousands):
|  |  | December 31, 2019
Principal |  |  | $ | 47,500 |
Less: unamortized debt discount and issuance costs |  |  | (962) |
Net carrying amount |  |  | $ | 46,538 |
The 2025 Notes consist of the following (in thousands):
| September 30, 2020 |  |
Liability component |  |  |
Principal | $ | 166,898 |  |  |
Add: fair value of embedded derivative | 2,929 |  |  |
Less: unamortized debt discount | (3,915) |  |  |
Less: unamortized issuance costs | (3,073) |  |  |
Net carrying amount | $ | 162,839 |  |  |
The 2022 Notes consist of the following (in thousands):
| September 30, 2020 |  | December 31, 2019
Liability component |  |  |
Principal | $ | — |  |  | $ | 105,125 |
Less: unamortized debt discount and issuance costs | — |  |  | (3,791) |
Net carrying amount | $ | — |  |  | $ | 101,334 |
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,
| 2020 |  | 2019 |  | 2020 |  | 2019
Contractual interest expense | $ | — |  |  | $ | 1,225 |  |  | $ | 1,667 |  |  | $ | 3,615 |
Amortization of debt discount | — |  |  | 333 |  |  | 859 |  |  | 999 |
Amortization of debt issuance costs | — |  |  | 40 |  |  | 103 |  |  | 120 |
Total interest expense | $ | — |  |  | $ | 1,598 |  |  | $ | 2,629 |  |  | $ | 4,734 |
The following table sets forth total interest expense recognized related to the 2025 Notes (in thousands):
| Three Months Ended September 30, 2020 |  | Nine Months Ended September 30, 2020
Contractual interest expense | $ | 1,278 |  |  |  | $ | 2,078 |  |
Amortization of debt discount | 217 |  |  |  | 341 |  |
Amortization of debt issuance costs | 172 |  |  |  | 268 |  |
Total interest expense | $ | 1,667 |  |  |  | $ | 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,
| 2020 |  | 2019 |  | 2020 |  | 2019
Contractual interest expense | $ | — |  |  | $ | 1,446 |  |  | $ | 768 |  |  | $ | 4,337 |
Amortization of debt discount | — |  |  | 1,955 |  |  | 1,952 |  |  | 5,866 |
Amortization of debt issuance costs | — |  |  | 115 |  |  | 111 |  |  | 344 |
Total interest expense | $ | — |  |  | $ | 3,516 |  |  | $ | 2,831 |  |  | $ | 10,547 |

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