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Convertible Preferred Stock- Summary of Preferred Stock (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2025
Increase (Decrease) in Temporary Equity [Roll Forward]        
Temporary equity, beginning balance (in shares)     175,190,188 175,190,188
Temporary equity, beginning balance $ 126,700 $ 94,147 $ 74,475 $ 74,475
Exercise of preferred stock warrants ( in shares)       1,988,999
Exercise of preferred stock warrant 264 650 130 $ 455
Issuance of Series E (in shares)       58,774,312
Issuance of Series E   31,903 19,542 $ 40,130
Conversion of redeemable convertible preferred stock to common stock upon IPO (in shares)       (235,953,499)
Conversion of redeemable convertible preferred stock to common stock upon IPO $ (126,964)     $ (115,060)
Temporary equity, ending balance (in shares) 0     0
Temporary equity, ending balance $ 0 $ 126,700 $ 94,147 $ 0
Series Seed Convertible Preferred Stock        
Increase (Decrease) in Temporary Equity [Roll Forward]        
Temporary equity, beginning balance (in shares)     15,851,401 15,851,401
Temporary equity, beginning balance     $ 1,337 $ 1,337
Exercise of preferred stock warrants ( in shares)       988,999
Exercise of preferred stock warrant       $ 83
Conversion of redeemable convertible preferred stock to common stock upon IPO (in shares)       (16,840,400)
Conversion of redeemable convertible preferred stock to common stock upon IPO       $ (1,420)
Temporary equity, ending balance (in shares) 0     0
Temporary equity, ending balance $ 0     $ 0
Series A Convertible Preferred Stock        
Increase (Decrease) in Temporary Equity [Roll Forward]        
Temporary equity, beginning balance (in shares)     22,399,370 22,399,370
Temporary equity, beginning balance     $ 5,600 $ 5,600
Conversion of redeemable convertible preferred stock to common stock upon IPO (in shares)       (22,399,370)
Conversion of redeemable convertible preferred stock to common stock upon IPO       $ (5,600)
Temporary equity, ending balance (in shares) 0     0
Temporary equity, ending balance $ 0     $ 0
Series B Convertible Preferred Stock        
Increase (Decrease) in Temporary Equity [Roll Forward]        
Temporary equity, beginning balance (in shares)     5,913,964 5,913,964
Temporary equity, beginning balance     $ 2,200 $ 2,200
Exercise of preferred stock warrants ( in shares)       1,000,000
Exercise of preferred stock warrant       $ 372
Conversion of redeemable convertible preferred stock to common stock upon IPO (in shares)       (6,913,964)
Conversion of redeemable convertible preferred stock to common stock upon IPO       $ (2,572)
Temporary equity, ending balance (in shares) 0     0
Temporary equity, ending balance $ 0     $ 0
Series C Convertible Preferred Stock        
Increase (Decrease) in Temporary Equity [Roll Forward]        
Temporary equity, beginning balance (in shares)     50,116,284 50,116,284
Temporary equity, beginning balance     $ 21,550 $ 21,550
Conversion of redeemable convertible preferred stock to common stock upon IPO (in shares)       (50,116,284)
Conversion of redeemable convertible preferred stock to common stock upon IPO       $ (21,550)
Temporary equity, ending balance (in shares) 0     0
Temporary equity, ending balance $ 0     $ 0
Series D Convertible Preferred Stock        
Increase (Decrease) in Temporary Equity [Roll Forward]        
Temporary equity, beginning balance (in shares)     80,909,169 80,909,169
Temporary equity, beginning balance     $ 43,788 $ 43,788
Conversion of redeemable convertible preferred stock to common stock upon IPO (in shares)       (80,909,169)
Conversion of redeemable convertible preferred stock to common stock upon IPO       $ (43,788)
Temporary equity, ending balance (in shares) 0     0
Temporary equity, ending balance $ 0     $ 0
Series E Convertible Preferred Stock        
Increase (Decrease) in Temporary Equity [Roll Forward]        
Temporary equity, beginning balance (in shares)     0 0
Temporary equity, beginning balance     $ 0 $ 0
Issuance of Series E (in shares)       58,774,312
Issuance of Series E       $ 40,130
Conversion of redeemable convertible preferred stock to common stock upon IPO (in shares)       (58,774,312)
Conversion of redeemable convertible preferred stock to common stock upon IPO       $ (40,130)
Temporary equity, ending balance (in shares) 0     0
Temporary equity, ending balance $ 0     $ 0