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Segment - Summary of Reconciles Reported Revenues to Net (Loss) Income under Significant Expense Principle (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Collaboration revenue $ 20,000 $ 0
Research and development expenses 32,716 19,572
Selling, general and administrative expense 11,499 7,536
Loss from operations (24,215) (27,108)
Interest income 4,358 3,045
Net loss (19,857) (24,063)
RAP-219 Program External Expenses    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Research and development expenses 15,821 7,963
Preclinical Programs External Expenses    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Research and development expenses 4,289 3,246
R & D Personnel-Related Costs (Including Stock-based Compensation)    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Research and development expenses 10,640 6,786
Other Costs    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Research and development expenses 1,966 1,577
G & A Personnel Related Costs (Including Stock-based Compensation)    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Selling, general and administrative expense 6,983 4,959
Professional and Consulting Costs    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Selling, general and administrative expense 3,672 1,664
Facility Related and Other    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Selling, general and administrative expense $ 844 $ 913