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Intangible Assets and Goodwill (Tables) | 12 Months Ended
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Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of finite-lived intangible assets, net | The components of intangible assets were as follows (in thousands, except for useful life):
|  |  | Balance at December 31, 2023 |  | Balance at December 31, 2022
| Weighted- Average Useful Lives (Years) |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Finite-lived intangible assets: |  |  |  |  |  |  |  |  |  |  |  |  |
Licensed IP | 12.5 |  | $ | 271,000 |  | $ | 163,318 |  | $ | 107,682 |  | $ | 271,000 |  | $ | 141,781 |  | $ | 129,219
Capitalized milestone payments | 13.3 |  | $ | 17,000 |  | $ | 1,137 |  | $ | 15,863 |  | $ | — |  | $ | — |  | $ | —
Schedule of estimated aggregate amortization expense | Estimated aggregate amortization expense based on the current carrying value of amortizable intangible assets will be as follows for the years ending December 31 (in thousands):
| 2024 |  | 2025 |  | 2026 |  | 2027 |  | 2028 |  | Thereafter
Amortization expense | $ | 22,817 |  | $ | 22,817 |  | $ | 22,817 |  | $ | 22,817 |  | $ | 22,817 |  | $ | 9,460

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