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Debt (Tables) | 9 Months Ended
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Sep. 30, 2022
Debt Disclosure [Abstract] |
Summary of Long-Term Debt | As of September 30, 2022 and December 31, 2021, long-term debt consisted of the following (in thousands):
| September 30, 2022 |  | December 31, 2021
| 2026 Notes |  | 2025 Notes |  | Total |  | 2026 Notes |  | 2025 Notes |  | Total
Outstanding principal balance | $ | 212,750 |  |  | $ | 150,000 |  |  | $ | 362,750 |  |  | $ | 212,750 |  |  | $ | 150,000 |  |  | $ | 362,750 |
Less: Debt issuance costs | (4,157) |  |  | (3,526) |  |  | (7,683) |  |  | (4,915) |  |  | (4,271) |  |  | (9,186) |
Carrying amount, long-term debt | $ | 208,593 |  |  | $ | 146,474 |  |  | $ | 355,067 |  |  | $ | 207,835 |  |  | $ | 145,729 |  |  | $ | 353,564 |
Summary of Total Interest Expense | The following tables set forth the total interest expense recognized related to the term loans and the convertible notes for the three and nine months ended September 30, 2022 and 2021 (in thousands):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2022 |  | 2021 |  | 2022 |  | 2021
Cash interest expense | $ | 2,274 |  |  | $ | 2,274 |  |  | $ | 6,801 |  |  | $ | 7,511 |
Payment in kind interest | — |  |  | — |  |  | — |  |  | 2,178 |
Amortization of debt discount | — |  |  | — |  |  | — |  |  | 1,750 |
Amortization of debt issuance costs | 529 |  |  | 511 |  |  | 1,504 |  |  | 1,671 |
Total interest expense | $ | 2,803 |  |  | $ | 2,785 |  |  | $ | 8,305 |  |  | $ | 13,110 |
Summary of Contractual Cash Obligations and Rights | The following table summarizes the Company's contractual obligation to settle commitments related to the 2026 Notes and 2025 Notes as of September 30, 2022 (in thousands):
| Payments due by Year
| Total |  | 2022 |  | 2023 |  | 2024 |  | 2025 |  | 2026 |  | Thereafter
Convertible Senior Notes Due 2026 | $ | 212,750 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 212,750 |  |  | $ | — |
Interest obligations on 2026 Notes (1) | 6,384 |  |  | — |  |  | 1,596 |  |  | 1,596 |  |  | 1,596 |  |  | 1,596 |  |  | — |
Convertible Senior Notes Due 2025 | 150,000 |  |  | — |  |  | — |  |  | — |  |  | 150,000 |  |  | — |  |  | — |
Interest obligations on 2025 Notes (1) | 26,250 |  |  | 3,750 |  |  | 7,500 |  |  | 7,500 |  |  | 7,500 |  |  | — |  |  | — |
(1) The 2026 Notes and 2025 Notes bear interest at a fixed rate of 0.750% and 5.000% per year, respectively.

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- Definition Tabular disclosure of contractual obligation by timing of payment due. Includes, but is not limited to, long-term debt obligation, lease obligation, and purchase obligation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 303 -Paragraph (a) -Subparagraph (5) + Details
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