Convertible Redeemable Preferred Stock - Schedule of Company's convertible redeemable preferred stock (Detail) - shares	Mar. 31, 2026	Dec. 31, 2025
Preferred Stock [Line Items]
Common Stock Issued	216,471,927	216,471,927
Preferred stock, shares outstanding		0
Preferred Stock Series Seed.[Member] \| Preferred Stock [Member]
Preferred Stock [Line Items]
Common Stock Issued	8,640,274
Preferred stock, shares outstanding	24,871,033
Preferred Stock Series Seed II [Member] \| Preferred Stock [Member]
Preferred Stock [Line Items]
Common Stock Issued	9,553,580
Preferred stock, shares outstanding	27,499,984
Preferred Stock Series A [Member] \| Preferred Stock [Member]
Preferred Stock [Line Items]
Common Stock Issued	35,266,967
Preferred stock, shares outstanding	101,515,976
Preferred Stock Series B [Member] \| Preferred Stock [Member]
Preferred Stock [Line Items]
Common Stock Issued	39,588,781
Preferred stock, shares outstanding	113,956,319
Preferred Stock Series B-1 [Member] \| Preferred Stock [Member]
Preferred Stock [Line Items]
Common Stock Issued	11,262,661
Preferred stock, shares outstanding	32,419,574
Preferred Stock Series C [Member] \| Preferred Stock [Member]
Preferred Stock [Line Items]
Common Stock Issued	20,983,132
Preferred stock, shares outstanding	60,399,952
Preferred Stock Series C-1 [Member] \| Preferred Stock [Member]
Preferred Stock [Line Items]
Common Stock Issued	7,945,030
Preferred stock, shares outstanding	22,869,771
Totals Redeemable Convertible Preferred Stock [Member]
Preferred Stock [Line Items]
Preferred stock, shares outstanding	0
Totals Redeemable Convertible Preferred Stock [Member] \| Preferred Stock [Member]
Preferred Stock [Line Items]
Common Stock Issued	133,240,425
Preferred stock, shares outstanding	383,532,609