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Stockholders' (Deficit) Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 07, 2023
Mar. 31, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Jun. 06, 2023
Jun. 05, 2023
May 12, 2023
Apr. 17, 2023
Class of Stock [Line Items]                    
Sale of common stock under Open Market Sales Agreement, net of issuance costs (in shares) 3,730,608                  
Issue price per share (in USD per share) $ 8.21                  
Sale of common stock under Open Market Sales Agreement, net of issuance costs $ 30,600 $ 2,282     $ 2,383 $ 597        
Issuance of common stock upon settlement of convertible promissory note, accrued interest, and related derivative liability (in shares) 5,059,338                  
Issuance of common stock upon settlement of convertible promissory note, accrued interest, and related derivative liability $ 35,000         $ 42,447        
Shares issued upon conversion of convertible preferred stock and exchangeable shares previously presented as noncontrolling interests (in shares) 18,872,711                  
Issuance of common stock to Sesen Bio shareholders in reverse capitalization (in shares) 10,374,272                  
Stock offering, amount                   $ 300,000
Sale of stock, maximum aggregate offering price                 $ 100,000  
Common stock, par value (in USD per share)     $ 0.001   $ 0.001 $ 0.001        
Common stock, shares authorized (in shares)     350,000,000   350,000,000 350,000,000 350,000,000 100,000,000    
Preferred stock, shares authorized (in shares)     5,000,000   5,000,000 5,000,000 5,000,000      
Preferred stock, par value (in USD per share)     $ 0.001   $ 0.001 $ 0.001 $ 0.001      
At-the-Market                    
Class of Stock [Line Items]                    
Sale of stock, maximum aggregate offering price                 $ 100,000  
Sale of stock (in shares)     0 931,250 1,136,384 226,533        
Gross proceeds       $ 2,300 $ 2,400 $ 600