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Segment Information - Schedule of Revenue, Significant Expenses, and Segment Profit and Loss (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting Information [Line Items]      
Revenue $ 43,073 $ 22,042 $ 11,131
Operating costs and expenses excluding stock-based compensation:      
Cost of revenue (excluding depreciation and amortization) 20,597 8,108 2,944
Research and development 136,827 92,321 43,978
Sales and marketing 28,395 18,270 8,385
General and administrative 71,055 50,722 35,966
Stock-based compensation 112,066 74,445 33,197
Other segment items:      
(Gain) loss on change in fair value of warrant liabilities 117,107 19,206 (30,136)
Other (income) expense, net 275 85 (6)
Income tax (benefit) expense 59 48 0
Net loss (331,647) (157,771) (48,511)
Operating Segment [Member]      
Segment Reporting Information [Line Items]      
Revenue 43,073 22,042 11,131
Operating costs and expenses excluding stock-based compensation:      
Cost of revenue (excluding depreciation and amortization) 15,857 5,289 2,042
Research and development 78,131 52,218 30,506
Sales and marketing 14,607 11,508 7,087
General and administrative 41,401 30,663 20,182
Stock-based compensation 106,878 69,743 31,456
Depreciation and amortization 18,654 10,375 5,604
Other segment items:      
(Gain) loss on change in fair value of warrant liabilities 117,107 19,206 (30,136)
Interest income, net (18,249) (19,322) (7,093)
Other (income) expense, net 275 85 (6)
Income tax (benefit) expense 59 48 0
Net loss $ (331,647) $ (157,771) $ (48,511)