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Paragon Option Agreements - Narrative (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Sep. 26, 2025
USD ($)
Apr. 28, 2025
USD ($)
Mar. 18, 2025
USD ($)
Jan. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Nov. 30, 2024
USD ($)
Sep. 30, 2024
USD ($)
employee
vote
Sep. 19, 2024
USD ($)
$ / shares
shares
Mar. 31, 2027
Mar. 31, 2026
Dec. 31, 2024
USD ($)
Sep. 30, 2025
USD ($)
employee
vote
Dec. 31, 2026
Dec. 31, 2025
USD ($)
Related Party                            
Asset Acquisition [Line Items]                            
Accounts payable and other current liabilities         $ 7,221           $ 7,221 $ 6,273    
License Agreement Terms | Paragon Option Agreements                            
Asset Acquisition [Line Items]                            
Number of employees overseeing and coordinating the project | employee             2         2    
Paragon Therapeutics | Paragon Option Agreements                            
Asset Acquisition [Line Items]                            
Accounts payable and other current liabilities                       $ 6,300    
Paragon Therapeutics | Paragon Option Agreements | Forecast                            
Asset Acquisition [Line Items]                            
Percent of outstanding shares                 1.00% 1.00%     1.00% 1.00%
Paragon Therapeutics | Paragon Option Agreements | Forecast | Related Party                            
Asset Acquisition [Line Items]                            
Percent of outstanding shares                     1.00%      
Paragon Therapeutics | License Agreement Terms | Paragon Option Agreements                            
Asset Acquisition [Line Items]                            
Number of employees overseeing and coordinating the project | employee             2         2    
Number of votes | vote             1         1    
Option agreement termination period, maximum contractual period             30 days         30 days    
Expiration period             30 days         30 days    
Termination period             30 days         30 days    
Research and development expense, paid       $ 3,300                    
Paragon Therapeutics | License Agreement Terms | Paragon Option Agreements | Research and development                            
Asset Acquisition [Line Items]                            
Development costs incurred                     $ 13,200      
Paragon Therapeutics | License Agreement Terms | Paragon Option Agreements | Related Party                            
Asset Acquisition [Line Items]                            
Accounts payable and other current liabilities         7,200           7,200      
Paragon Therapeutics | License Agreement Terms | Paragon Option Agreements | Related Party | Research and development                            
Asset Acquisition [Line Items]                            
Development costs incurred                     13,200      
Paragon Therapeutics | License Agreement Terms | Paragon Option Agreements | Related Party | General and administrative                            
Asset Acquisition [Line Items]                            
Development costs incurred                     100      
Paragon Therapeutics | License Agreement Terms | CR-001 | Paragon Option Agreements                            
Asset Acquisition [Line Items]                            
Non-refundable milestone payments     $ 22,000       $ 22,000              
Milestone payment   $ 2,500                        
Percent reduction to royalty payment due to invalid patent                       30.00%    
Termination period due to breach of contract                       60 days    
Sublicense agreement period                       30 days    
Upfront research and development cost reimbursement           $ 1,500   $ 1,500            
Research plan finalization payment         1,300                  
Milestone payment       $ 1,500                    
Research and development expense incurred                     10,500      
Research and development expense, paid                     5,200      
Research and development expense, accrued                     600      
Paragon Therapeutics | License Agreement Terms | CR-001 | Paragon Option Agreements | Research and development                            
Asset Acquisition [Line Items]                            
Upfront development costs (less than)                     1,500      
Development costs incurred                     4,600      
Paragon Therapeutics | License Agreement Terms | CR-001 | Paragon Option Agreements | General and administrative                            
Asset Acquisition [Line Items]                            
Upfront development costs (less than)                     100      
Development costs incurred                     100      
Paragon Therapeutics | License Agreement Terms | CR-001 | Paragon Option Agreements | Related Party                            
Asset Acquisition [Line Items]                            
Non-refundable milestone payments                     12,000      
Accounts payable and other current liabilities         6,200           6,200      
Milestone payment                     10,000      
Paragon Therapeutics | License Agreement Terms | CR-001 | Paragon Option Agreements | Paragon Therapeutics                            
Asset Acquisition [Line Items]                            
Non-cash upfront consideration, common stock issued (in shares) | shares               722,500            
Non-cash upfront consideration, common stock, value per share (in dollars per share) | $ / shares               $ 1.38            
Non-cash upfront consideration, common stock issued, value               $ 1,000            
Development costs incurred                     4,700      
Paragon Therapeutics | License Agreement Terms | CR-001 | Paragon Option Agreements | Parascent Holding LLC                            
Asset Acquisition [Line Items]                            
Non-cash upfront consideration, common stock issued (in shares) | shares               361,250            
Paragon Therapeutics | License Agreement Terms | CR-001 | Paragon Option Agreements | Forecast                            
Asset Acquisition [Line Items]                            
Research and development expense, paid                           $ 4,700
Paragon Therapeutics | License Agreement Terms | CR-002 | Paragon Option Agreements                            
Asset Acquisition [Line Items]                            
Non-refundable milestone payments $ 46,000           $ 46,000              
Accounts payable and other current liabilities         800           800      
Development costs incurred                     800      
Research plan finalization payment         $ 2,500                  
Pre-development costs incurred                     0      
Paragon Therapeutics | License Agreement Terms | CR-002 | Paragon Option Agreements | Research and development                            
Asset Acquisition [Line Items]                            
Development costs incurred                     800      
Paragon Therapeutics | License Agreement Terms | CR-002 | Paragon Option Agreements | General and administrative                            
Asset Acquisition [Line Items]                            
Development costs incurred                     100      
Paragon Therapeutics | License Agreement Terms | CR-002 | Paragon Option Agreements | Related Party                            
Asset Acquisition [Line Items]                            
Non-refundable milestone payments                     26,000      
Milestone payment                     $ 20,000      
Paragon Therapeutics | License Agreement Terms | CR-003 | Paragon Option Agreements                            
Asset Acquisition [Line Items]                            
Non-refundable milestone payments   $ 46,000