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Redeemable Convertible Preferred Stock - Additional Information (Details) $ / shares in Units, $ in Thousands |  |  |  |  |  |  | 1 Months Ended | 2 Months Ended | 3 Months Ended |  |  |  |  |  |  |  |
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Dec. 06, 2023 USD ($) $ / shares shares | Nov. 03, 2023 USD ($) shares | Sep. 08, 2023 USD ($) shares | Mar. 02, 2023 USD ($) $ / shares shares | Apr. 26, 2022 investor $ / shares shares | Dec. 23, 2020 USD ($) $ / shares shares | Jul. 31, 2022 investor shares | Mar. 31, 2022 USD ($) $ / shares | Nov. 03, 2023 USD ($) | Sep. 30, 2023 USD ($) shares | Mar. 31, 2023 USD ($) shares | Sep. 30, 2024 $ / shares shares | Sep. 14, 2024 shares | Sep. 12, 2024 shares | Jun. 30, 2024 shares | Mar. 31, 2024 shares | Dec. 31, 2023 $ / shares shares | Jun. 30, 2023 shares | Dec. 31, 2022 shares
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redeemable convertible preferred stock, par value (in usd per share) | $ / shares |  |  |  |  | $ 0.0001 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redeemable convertible preferred stock, authorized (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |
Redeemable convertible preferred stock, shares outstanding (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |
Seed Series Redeemable Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued (in shares) |  |  |  |  | 5,350,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redeemable convertible preferred stock, par value (in usd per share) | $ / shares |  |  |  |  | $ 0.0001 |  |  |  |  |  |  | $ 0.0001 |  |  |  |  | $ 0.0001 |  |
Price per share (in usd per share) | $ / shares |  |  |  |  | $ 1.00 |  |  | $ 1.00 |  |  |  |  |  |  |  |  |  |  |
Redeemable convertible preferred stock, authorized (in shares) |  |  |  | 81,790,144 | 50,940,144 |  |  |  |  |  |  | 0 |  |  |  |  | 81,790,144 |  |
Proceeds from issuance of preferred stock and preferred stock tranche rights, net | $ |  |  |  |  |  |  |  | $ 5,400 |  |  |  |  |  |  |  |  |  |  |
Number of investors | investor |  |  |  |  | 2 |  | 2 |  |  |  |  |  |  |  |  |  |  |  |
Redeemable convertible preferred stock, shares outstanding (in shares) |  |  |  |  |  |  |  |  |  | 81,790,144 | 81,790,144 | 0 |  | 81,790,144 | 81,790,144 | 81,790,144 | 81,790,144 | 81,790,144 | 81,790,144
Seed Series Redeemable Convertible Preferred Stock | Two Investors |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued (in shares) |  |  |  |  |  | 4,000,000 | 3,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Redeemable convertible preferred stock, shares outstanding (in shares) |  |  |  |  |  |  |  |  |  |  |  | 7,000,000 |  |  |  |  |  |  |
Seed Series Redeemable Convertible Preferred Stock | Two Investors, Relatives Of Board Member |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued (in shares) |  |  |  |  |  | 350,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Series B Redeemable Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued (in shares) |  |  |  | 37,073,162 |  |  |  |  |  | 39,024,386 | 37,073,162 |  |  |  |  |  |  |  |
Redeemable convertible preferred stock, par value (in usd per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 0.0001 |  |  |  |  | $ 0.0001 |  |
Price per share (in usd per share) | $ / shares |  |  |  | $ 1.025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from issuance | $ |  | $ 6,000 | $ 8,000 |  |  |  |  |  |  | $ 39,817 | $ 37,185 |  |  |  |  |  |  |  |
Gross proceeds from issuance | $ |  |  |  | $ 37,800 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redeemable convertible preferred stock, authorized (in shares) |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  | 105,595,101 |  |
Redeemable convertible preferred stock, shares outstanding (in shares) |  |  |  |  |  |  |  |  |  | 76,097,548 | 37,073,162 | 0 |  | 105,595,101 | 105,595,101 | 105,595,101 | 105,595,101 | 37,073,162 | 0
Series B Redeemable Convertible Preferred Stock, Milestone Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued (in shares) |  | 29,497,553 | 39,024,386 | 68,521,939 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from issuance | $ |  |  |  |  |  |  |  |  | $ 69,900 |  |  |  |  |  |  |  |  |  |
Initial fair value of liability | $ |  |  |  | $ 600 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series C Redeemable Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued (in shares) | 119,599,872 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redeemable convertible preferred stock, par value (in usd per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 0.0001 |  |  |  |  | $ 0.0001 |  |
Price per share (in usd per share) | $ / shares | $ 1.3796 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from issuance | $ | $ 164,600 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redeemable convertible preferred stock, authorized (in shares) |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  | 119,599,872 |  |
Redeemable convertible preferred stock, shares outstanding (in shares) |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 119,599,872 | 119,599,872 | 119,599,872 | 119,599,872 |  |
Purchase price for put option (in usd per share) | $ / shares | $ 1.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Biocon Limited | Seed Series Redeemable Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued (in shares) |  |  |  |  |  | 40,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Redeemable convertible preferred stock, par value (in usd per share) | $ / shares |  |  |  |  |  | $ 0.0001 |  |  |  |  |  |  |  |  |  |  |  |  |
Price per share (in usd per share) | $ / shares |  |  |  |  |  | $ 1.00 |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from issuance | $ |  |  |  |  |  | $ 40,000 |  |  |  |  |  |  |  |  |  |  |  |  |

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