Related Party Transactions - Narrative (Details) - Related Party	Jun. 30, 2025
Crescent Biopharma \| Paragon Therapeutics
Related Party Transaction [Line Items]
Ownership percentage (less than for Paragon and Parascent, and more than for Fairmount) (in percent)	5.00%
Crescent Biopharma \| Parascent Holding LLC
Related Party Transaction [Line Items]
Ownership percentage (less than for Paragon and Parascent, and more than for Fairmount) (in percent)	5.00%
Crescent Biopharma \| Fairmount Healthcare Fund II L.P.
Related Party Transaction [Line Items]
Ownership percentage (less than for Paragon and Parascent, and more than for Fairmount) (in percent)	5.00%
Paragon Therapeutics \| Fairmount Healthcare Fund II L.P.
Related Party Transaction [Line Items]
Ownership percentage (less than for Paragon and Parascent, and more than for Fairmount) (in percent)	5.00%

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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+ Details