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CONSOLIDATED STATEMENTS OF REDEEMABLE CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT ) - USD ($) $ in Thousands | Redeemable convertible preferred stock issued in May 2023 Series B-2 And B-2A Redeemable Convertible Preferred Stock | Redeemable convertible preferred stock issued in October 2023 Series B-2 And B-2A Redeemable Convertible Preferred Stock | Redeemable convertible preferred stock issued in March 2024 Series C redeemable convertible preferred stock | Redeemable convertible preferred stock issued in May 2024 Series C redeemable convertible preferred stock | IPO Common Stock Voting common stock | IPO Additional Paid-in Capital Voting common stock | IPO Voting common stock | Private Placement Common Stock Voting common stock | Private Placement Additional Paid-in Capital Voting common stock | Private Placement Voting common stock | Common Stock | Additional Paid-in Capital | Accumulate Other Comprehensive Income (Loss) | Accumulated Deficit | Series B-2A redeemable convertible preferred stock | Voting common stock | Total
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Redeemable Convertible Preferred Stock, Beginning balance at Dec. 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 285,473
Redeemable Convertible Preferred Stock, Beginning balance (in shares) at Dec. 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 67,960,088
Redeemable convertible preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of redeemable convertible preferred stock for cash, net of derivative liability and offering cost | $ 57,679 | $ 32,218 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of redeemable convertible preferred stock for cash, net of derivative liability and offering cost (in shares) | 12,000,000 | 6,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redeemable Convertible Preferred Stock, Ending balance at Dec. 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8,928 |  | $ 375,370
Redeemable Convertible Preferred Stock, Ending balance (in shares) at Dec. 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 85,960,088
Beginning balance at Dec. 31, 2022 |  |  |  |  |  |  |  |  |  |  | $ 1 | $ 14,209 | $ (127) | $ (209,325) |  |  | $ (195,242)
Beginning balance (in shares) at Dec. 31, 2022 |  |  |  |  |  |  |  |  |  |  | 2,642,334 |  |  |  |  |  |
Stockholders' deficit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock upon exercise of stock options and early exercised stock options |  |  |  |  |  |  |  |  |  |  |  | 277 |  |  |  |  | 277
Issuance of common stock upon exercise of stock options and early exercised stock options (in shares) |  |  |  |  |  |  |  |  |  |  | 48,442 |  |  |  |  |  |
Vesting of early exercised stock options |  |  |  |  |  |  |  |  |  |  |  | 1,921 |  |  |  |  | 1,921
Vesting of restricted shares of common stock |  |  |  |  |  |  |  |  |  |  |  | 23 |  |  |  |  | 23
Repurchase of unvested shares of restricted common stock (in shares) |  |  |  |  |  |  |  |  |  |  | (14,797) |  |  |  |  |  |
Stock-based compensation expense |  |  |  |  |  |  |  |  |  |  |  | 8,625 |  |  |  |  | 8,625
Other comprehensive income (loss), net |  |  |  |  |  |  |  |  |  |  |  |  | 129 |  |  |  | 129
Net loss |  |  |  |  |  |  |  |  |  |  |  |  |  | (154,993) |  |  | (154,993)
Ending balance at Dec. 31, 2023 |  |  |  |  |  |  |  |  |  |  | $ 1 | 25,055 | 2 | (364,318) |  |  | (339,260)
Ending balance (in shares) at Dec. 31, 2023 |  |  |  |  |  |  |  |  |  |  | 2,675,979 |  |  |  |  | 2,675,979 |
Redeemable convertible preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion and redesignation of redeemable convertible preferred stock into 28,855,656 shares of voting common stock and 7,184,908 shares of non-voting common stock in connection with initial public offering |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (639,237)
Conversion and redesignation of redeemable convertible preferred stock into 28,855,656 shares of voting common stock and 7,184,908 shares of non-voting common stock in connection with initial public offering (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (168,489,871)
Issuance of redeemable convertible preferred stock for cash, net of derivative liability and offering cost |  |  | $ 120,205 | $ 143,662 |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of redeemable convertible preferred stock for cash, net of derivative liability and offering cost (in shares) |  |  | 41,264,891 | 41,264,892 |  |  |  |  |  |  |  |  |  |  |  |  |
Redeemable Convertible Preferred Stock, Ending balance (in shares) at Dec. 31, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0
Stockholders' deficit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of voting common stock |  |  |  |  | $ 1 | $ 193,315 | $ 193,316 |  | $ 40,000 | $ 40,000 |  |  |  |  |  |  |
Issuance of voting common stock (in shares) |  |  |  |  | 13,125,000 |  |  | 2,500,000 |  |  |  |  |  |  |  |  |
Conversion and redesignation of redeemable convertible preferred stock into 28,855,656 shares of voting common stock and 7,184,908 shares of non-voting common stock in connection with initial public offering |  |  |  |  |  |  |  |  |  |  | $ 3 | 639,234 |  |  |  |  | $ 639,237
Conversion and redesignation of redeemable convertible preferred stock into 28,855,656 shares of voting common stock and 7,184,908 shares of non-voting common stock in connection with initial public offering (in shares) |  |  |  |  |  |  |  |  |  |  | 36,040,564 |  |  |  |  |  |
Issuance of common stock upon exercise of stock options and early exercised stock options |  |  |  |  |  |  |  |  |  |  |  | 375 |  |  |  |  | $ 375
Issuance of common stock upon exercise of stock options and early exercised stock options (in shares) |  |  |  |  |  |  |  |  |  |  | 72,201 |  |  |  |  |  | 72,201
Vesting of early exercised stock options |  |  |  |  |  |  |  |  |  |  |  | 1,154 |  |  |  |  | $ 1,154
Vesting of restricted shares of common stock |  |  |  |  |  |  |  |  |  |  |  | 20 |  |  |  |  | 20
Repurchase of unvested shares of restricted common stock (in shares) |  |  |  |  |  |  |  |  |  |  | (6,417) |  |  |  |  |  |
Stock-based compensation expense |  |  |  |  |  |  |  |  |  |  |  | 19,457 |  |  |  |  | 19,457
Other comprehensive income (loss), net |  |  |  |  |  |  |  |  |  |  |  |  | 38 |  |  |  | 38
Net loss |  |  |  |  |  |  |  |  |  |  |  |  |  | (294,233) |  |  | (294,233)
Ending balance at Dec. 31, 2024 |  |  |  |  |  |  |  |  |  |  | $ 5 | $ 918,610 | $ 40 | $ (658,551) |  |  | $ 260,104
Ending balance (in shares) at Dec. 31, 2024 |  |  |  |  |  |  |  |  |  |  | 54,407,327 |  |  |  |  | 47,222,419 |

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