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Common Stock (Details) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 13, 2024
Sep. 30, 2024
Sep. 30, 2024
Jun. 30, 2024
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2024
Dec. 31, 2023
Sep. 14, 2024
Sep. 12, 2024
Mar. 31, 2024
Dec. 31, 2022
Class of Stock [Line Items]                          
Common stock, shares authorized (in shares) 500,000,000 500,000,000 500,000,000         500,000,000 365,000,000        
Common stock, par value (in usd per share) $ 0.0001 $ 0.0001 $ 0.0001         $ 0.0001 $ 0.0001        
Common stock, shares issued (in shares)   54,424,994 54,424,994         54,424,994 711,895        
Common stock, shares outstanding (in shares)   54,409,708 54,409,708         54,409,708 640,386        
Issuance of common stock upon exercise of stock options (in shares)               393,216          
Proceeds from issuance on common stock, net of issuance costs $ 332.4 $ 332.4                      
Offering expenses $ 29.8                        
Number of shares issued in transaction (in shares)   20,125,000                      
Redeemable convertible preferred stock, shares outstanding (in shares)                   0      
Biocon Limited                          
Class of Stock [Line Items]                          
Common stock, shares outstanding (in shares)                 115,757        
2019 Stock Option And Grant Plan                          
Class of Stock [Line Items]                          
Common stock, capital shares reserved for future issuance (in shares)   5,881,181 5,881,181         5,881,181          
Issuance of common stock upon exercise of stock options (in shares)                 87,404        
Common stock                          
Class of Stock [Line Items]                          
Common stock, shares outstanding (in shares)   54,409,708 54,409,708 1,023,541 579,975 575,746 514,972 54,409,708 640,386     640,386 504,544
Issuance of common stock upon exercise of stock options (in shares)     43,232 349,962 4,229 6,739 10,428            
Vesting of restricted common stock (in shares)     7,059 33,193   54,035              
Conversion of convertible preferred stock into common stock upon initial public offering (in shares)     33,210,876                    
IPO                          
Class of Stock [Line Items]                          
Number of shares issued in transaction (in shares) 17,500,000                        
IPO | Common stock                          
Class of Stock [Line Items]                          
Conversion of convertible preferred stock into common stock upon initial public offering (in shares) 33,210,876                        
Restricted Stock                          
Class of Stock [Line Items]                          
Vesting of restricted common stock (in shares)               40,252          
Restricted Stock | 2019 Stock Option And Grant Plan                          
Class of Stock [Line Items]                          
Vesting of restricted common stock (in shares)                 437,203        
Seed Series Redeemable Convertible Preferred Stock                          
Class of Stock [Line Items]                          
Redeemable convertible preferred stock, shares outstanding (in shares)   0 0 81,790,144 81,790,144 81,790,144 81,790,144 0 81,790,144   81,790,144 81,790,144 81,790,144
Series B Redeemable Convertible Preferred Stock                          
Class of Stock [Line Items]                          
Redeemable convertible preferred stock, shares outstanding (in shares)   0 0 105,595,101 76,097,548 37,073,162 37,073,162 0 105,595,101   105,595,101 105,595,101 0
Series C Redeemable Convertible Preferred Stock                          
Class of Stock [Line Items]                          
Redeemable convertible preferred stock, shares outstanding (in shares)   0 0 119,599,872       0 119,599,872   119,599,872 119,599,872