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Related Party Transactions (Tables) | 9 Months Ended
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Sep. 30, 2025
Related Party Transactions [Abstract] |
Schedule of Expenses Related to Related Party Which are Settled in Cash | The following is the summary of expenses related to the Paragon Agreement and License Agreements, which are ultimately settled in cash (in millions) and recorded within Research and development in the consolidated statement of operations for the periods presented:
| Three Months Ended September 30, |  | Nine Months Ended September 30, |  |
| 2025 |  | 2024 |  | 2025 |  | 2024 |
Reimbursable costs under the Paragon Agreement | $ | — |  |  | $ | 1.3 |  |  | $ | 0.1 |  |  | $ | 15.3 |  |  |
License Agreements milestone and sublicensing fees | 7.0 |  |  | 0.3 |  |  | 9.5 |  |  | 5.9 |  |  |
Total related party expense (excludes stock-based compensation) | $ | 7.0 |  |  | $ | 1.6 |  |  | $ | 9.6 |  |  | $ | 21.2 |  |  |
Schedule of Related Party Accounts Payable and Other Current Liabilities | The following is the summary of Related party accounts payable and other current liabilities (in millions):
| September 30, 2025 |  | December 31, 2024
Reimbursable costs under the Paragon Agreement | $ | — |  |  | $ | 0.1 |
License Agreements development milestone liability (see Note 6) | 4.0 |  |  | 0.5 |
Total related party accounts payable | $ | 4.0 |  |  | $ | 0.6 |

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- Definition Tabular disclosure of related party transactions. Examples of related party transactions include, but are not limited to, transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners and (d) affiliates. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 850 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483326/850-10-50-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 850 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483326/850-10-50-1 + Details
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