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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Income Statement [Abstract]    
Revenue (including $38,370 and $5,096 from a related party for the three months ended March 31, 2026 and 2025, respectively) $ 282,465 $ 235,048
Costs and expenses    
Cost of revenue 594,170 463,560
Research and development 335,670 251,246
Selling, general and administrative 304,176 212,175
Workforce reduction charges 37,934 0
Total cost and expenses 1,271,950 926,981
Loss from operations (989,485) (691,933)
Other income (expense), net    
Change in fair value of common stock warrant liability 0 12,861
Change in fair value of equity securities of a related party (10,221) (13,453)
Change in fair value of derivative liabilities associated with redeemable convertible preferred stock (related party) 7,375 281,700
Interest income 13,104 52,209
Interest expense (including $11,309 and $3,700 to a related party for the three months ended March 31, 2026 and 2025, respectively) (41,073) (11,883)
Other income (expense), net (7,867) 2,965
Total other income (expense), net (38,682) 324,399
Loss before provision for (benefit from) income taxes (1,028,167) (367,534)
Provision for (benefit from) income taxes 177 (1,363)
Net loss (1,028,344) (366,171)
Accretion of redeemable convertible preferred stock (related party) (105,962) (364,925)
Net loss attributable to common stockholders, basic (1,134,306) (731,096)
Net loss attributable to common stockholders, diluted $ (1,134,306) $ (731,096)
Weighted-average shares outstanding attributable to common stockholders    
Basic (in shares) [1] 328,285,861 303,631,731
Diluted (in shares) [1] 328,285,861 303,631,731
Net loss per share attributable to common stockholders    
Basic (in dollars per share) [1] $ (3.46) $ (2.41)
Diluted (in dollars per share) [1] $ (3.46) $ (2.41)
Other comprehensive income (loss)    
Net unrealized gains (losses) on investments, net of tax $ (1,385) $ 3,552
Reclassification adjustment for realized gains on investments included in net loss (5,702) 0
Foreign currency translation adjustments (1,092) 3,897
Total other comprehensive income (loss) (8,179) 7,449
Comprehensive loss (1,036,523) (358,722)
Accretion of redeemable convertible preferred stock (related party) (105,962) (364,925)
Comprehensive loss attributable to common stockholders $ (1,142,485) $ (723,647)
[1] The weighted-average shares outstanding attributable to common stockholders and net loss per share attributable to common stockholders have been adjusted for the prior periods presented to reflect the one-for-ten (1:10) reverse stock split effected on August 29, 2025. See Note 2 “Summary of Significant Accounting Policies” for more information.