Convertible Redeemable Preferred Stock - Schedule of Company's Convertible Redeemable Preferred Stock (Detail) - shares	Jun. 30, 2026	Dec. 31, 2025
Temporary Equity [Line Items]
Common stock, shares issued (in shares)	224,681,185	17,449,020
Preferred stock, shares outstanding (in shares)	0	0
Totals Redeemable Convertible Preferred Stock
Temporary Equity [Line Items]
Preferred stock, shares outstanding (in shares)	0
Totals Redeemable Convertible Preferred Stock \| Preferred Stock
Temporary Equity [Line Items]
Common stock, shares issued (in shares)	133,240,425
Preferred stock, shares outstanding (in shares)	383,532,609
Preferred Stock Series Seed \| Preferred Stock
Temporary Equity [Line Items]
Common stock, shares issued (in shares)	8,640,274
Preferred stock, shares outstanding (in shares)	24,871,033
Preferred Stock Series Seed II \| Preferred Stock
Temporary Equity [Line Items]
Common stock, shares issued (in shares)	9,553,580
Preferred stock, shares outstanding (in shares)	27,499,984
Preferred Stock Series A \| Preferred Stock
Temporary Equity [Line Items]
Common stock, shares issued (in shares)	35,266,967
Preferred stock, shares outstanding (in shares)	101,515,976
Preferred Stock Series B \| Preferred Stock
Temporary Equity [Line Items]
Common stock, shares issued (in shares)	39,588,781
Preferred stock, shares outstanding (in shares)	113,956,319
Preferred Stock Series B-1 \| Preferred Stock
Temporary Equity [Line Items]
Common stock, shares issued (in shares)	11,262,661
Preferred stock, shares outstanding (in shares)	32,419,574
Preferred Stock Series C \| Preferred Stock
Temporary Equity [Line Items]
Common stock, shares issued (in shares)	20,983,132
Preferred stock, shares outstanding (in shares)	60,399,952
Preferred Stock Series C-1 \| Preferred Stock
Temporary Equity [Line Items]
Common stock, shares issued (in shares)	7,945,030
Preferred stock, shares outstanding (in shares)	22,869,771