Net Loss per Share - Schedule of Net Loss Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net loss	$ (222,187)	$ (77,686)	$ (357,141)	$ (234,588)
Less: Deemed Dividend	0	(4,153)	0	(4,153)
Net loss available to common stockholders	(222,187)	(81,839)	(357,141)	(238,741)
Net loss available to common stockholders	$ (222,187)	$ (81,839)	$ (357,141)	$ (238,741)
Class A Common Stock
Weighted average shares used in computing net loss per share of Class A and B Common Stock:
Basic (in shares)	143,159,121	15,379,402	107,784,739	8,707,165
Diluted (in shares)	143,159,121	15,379,402	107,784,739	8,707,165
Net loss per share of Class A and B Common Stock attributable to common stockholders:
Basic (in dollars per share)	$ (1.55)	$ (5.32)	$ (3.31)	$ (27.42)
Diluted (in dollars per share)	$ (1.55)	$ (5.32)	$ (3.31)	$ (27.42)
Class B Common Stock
Weighted average shares used in computing net loss per share of Class A and B Common Stock:
Basic (in shares)	143,159,121	15,379,402	107,784,739	8,707,165
Diluted (in shares)	143,159,121	15,379,402	107,784,739	8,707,165
Net loss per share of Class A and B Common Stock attributable to common stockholders:
Basic (in dollars per share)	$ (1.55)	$ (5.32)	$ (3.31)	$ (27.42)
Diluted (in dollars per share)	$ (1.55)	$ (5.32)	$ (3.31)	$ (27.42)