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Intangible Assets and Goodwill | 12 Months Ended
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Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets and Goodwill | Note 9. Intangible Assets and Goodwill 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 |  | $ | — |  | $ | — |  | $ | —
Amortization expense was $22.5 million for the year ended December 31, 2023, and amortization expense was $21.5 million for the years ended December 31, 2022 and 2021 and is recorded in cost of product revenues on the consolidated statement of operations. 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
Goodwill There were no changes to the carrying amount of goodwill for the years ended December 31, 2023 and 2022.

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 350 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//350/tableOfContent + Details
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