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Intangible Assets and Goodwill | 3 Months Ended
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Mar. 31, 2025
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets and Goodwill | 6. Intangible assets and goodwill Intangible assets, net Intangible assets, net consisted of the following as of March 31, 2025:
|  | Gross value |  |  | Accumulated amortization |  |  | Net book value |  |  | Weighted- average remaining useful life |
|  | (in thousands) |  |  | (in years) |
In-process research and development — RAS Programs |  | $ | 55,800 |  |  | $ | — |  |  | $ | 55,800 |  |  | n/a |
Developed technology — tri-complex platform |  |  | 7,480 |  |  |  | (6,877 | ) |  |  | 603 |  |  |  | 0.6 |
Total |  | $ | 63,280 |  |  | $ | (6,877 | ) |  | $ | 56,403 |  |  |  |
Amortization expense for the three months ended March 31, 2025 and 2024 was $0.3 million. As of March 31, 2025, future amortization expense was as follows:
|  | Amount |
|  | (in thousands) |
2025 (remaining seven months) |  | $ | 603 |
Total |  | $ | 603 |
Intangible assets, net consisted of the following as of December 31, 2024:
|  | Gross value |  |  | Accumulated amortization |  |  | Net book value |  |  | Weighted- average remaining useful life |
|  | (in thousands) |  |  | (in years) |
In-process research and development — RAS Programs |  | $ | 55,800 |  |  | $ | — |  |  | $ | 55,800 |  |  | n/a |
Developed technology — tri-complex platform |  |  | 7,480 |  |  |  | (6,610 | ) |  |  | 870 |  |  |  | 0.9 |
Total |  | $ | 63,280 |  |  | $ | (6,610 | ) |  | $ | 56,670 |  |  |  |
Goodwill The following summarizes the change in the carrying value of goodwill for the three months ended March 31, 2025:
|  | Amount |
|  | (in thousands) |
Balance at December 31, 2024 |  | $ | 14,608 |
Adjustment |  |  | — |
Balance at March 31, 2025 |  | $ | 14,608 |
No impairment had been recognized as of March 31, 2025. Goodwill recorded is not deductible for income tax purposes.

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/350-30/tableOfContent Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/350-20/tableOfContent + Details
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