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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 |

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