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Debt (Tables) | 6 Months Ended
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Jun. 30, 2020
Debt Disclosure [Abstract] |
Schedule of Net Carrying Amount of Debt | The Term Loan consists 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):
| June 30, 2020 |  |
Liability component |  |  |
Principal | $ | 180,375 |  |  |
Add: fair value of embedded derivative | 3,756 |  |  |
Less: unamortized debt discount | (4,458) |  |  |
Less: unamortized issuance costs | (3,502) |  |  |
Net carrying amount | $ | 176,171 |  |  |
The 2022 Notes consist of the following (in thousands):
| June 30, 2020 |  | December 31, 2019
Liability component |  |  |
Principal | $ | 2 |  |  | $ | 105,125 |
Less: unamortized debt discount and issuance costs | — |  |  | (3,791) |
Net carrying amount | $ | 2 |  |  | $ | 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 June 30, |  |  |  | Six Months Ended June 30, |  |
| 2020 |  | 2019 |  | 2020 |  | 2019
Contractual interest expense | $ | 516 |  |  | $ | 1,210 |  |  | $ | 1,667 |  |  | $ | 2,390 |
Amortization of debt discount | 526 |  |  | 333 |  |  | 859 |  |  | 666 |
Amortization of debt issuance costs | 63 |  |  | 40 |  |  | 103 |  |  | 80 |
Total interest expense | $ | 1,105 |  |  | $ | 1,583 |  |  | $ | 2,629 |  |  | $ | 3,136 |
The following table sets forth total interest expense recognized related to the 2025 Notes (in thousands):
| Three Months Ended June 30, 2020 |  |  | Six Months Ended June 30, 2020 |
Contractual interest expense | $ | 800 |  |  |  | $ | 800 |  |
Amortization of debt discount | 124 |  |  |  | 124 |  |
Amortization of debt issuance costs | 96 |  |  |  | 96 |  |
Total interest expense | $ | 1,020 |  |  |  | $ | 1,020 |  |
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
Contractual interest expense | $ | 286 |  |  | $ | 1,445 |  |  | $ | 768 |  |  | $ | 2,891 |
Amortization of debt discount | 700 |  |  | 1,955 |  |  | 1,952 |  |  | 3,911 |
Amortization of debt issuance costs | 39 |  |  | 115 |  |  | 111 |  |  | 229 |
Total interest expense | $ | 1,025 |  |  | $ | 3,515 |  |  | $ | 2,831 |  |  | $ | 7,031 |

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