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Fair Value Measurements - Summary of fair value measurements on a recurring basis and the level of inputs (Detail) - Fair Value, Recurring [Member] - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Assets:    
Cash and cash equivalents $ 352,322 $ 56,840
Total assets 1,491,258 366,281
Liabilities:    
Warrant liabilities 1,768,232 70,688
Short-term Investments [Member]    
Assets:    
Investments 736,333 285,896
Other Long-term Investments [Member]    
Assets:    
Investments 402,603 23,545
Cash and money market funds [Member]    
Assets:    
Cash and cash equivalents [1] 301,408 33,204
Corporate Notes And Bonds [Member] | Short-term Investments [Member]    
Assets:    
Investments 3,483 43,868
Corporate Notes And Bonds [Member] | Other Long-term Investments [Member]    
Assets:    
Investments   1,924
U.S. Government and Agency [Member]    
Assets:    
Cash and cash equivalents 50,914 23,636
U.S. Government and Agency [Member] | Short-term Investments [Member]    
Assets:    
Investments 732,850 242,028
U.S. Government and Agency [Member] | Other Long-term Investments [Member]    
Assets:    
Investments 402,603 21,621
Quoted Prices in Active Markets (Level 1) [Member]    
Assets:    
Cash and cash equivalents 301,408 33,204
Total assets 301,408 33,204
Liabilities:    
Warrant liabilities 86,299 70,688
Quoted Prices in Active Markets (Level 1) [Member] | Short-term Investments [Member]    
Assets:    
Investments 0 0
Quoted Prices in Active Markets (Level 1) [Member] | Other Long-term Investments [Member]    
Assets:    
Investments 0 0
Quoted Prices in Active Markets (Level 1) [Member] | Cash and money market funds [Member]    
Assets:    
Cash and cash equivalents [1] 301,408 33,204
Quoted Prices in Active Markets (Level 1) [Member] | Corporate Notes And Bonds [Member] | Short-term Investments [Member]    
Assets:    
Investments 0 0
Quoted Prices in Active Markets (Level 1) [Member] | Corporate Notes And Bonds [Member] | Other Long-term Investments [Member]    
Assets:    
Investments   0
Quoted Prices in Active Markets (Level 1) [Member] | U.S. Government and Agency [Member]    
Assets:    
Cash and cash equivalents 0 0
Quoted Prices in Active Markets (Level 1) [Member] | U.S. Government and Agency [Member] | Short-term Investments [Member]    
Assets:    
Investments 0 0
Quoted Prices in Active Markets (Level 1) [Member] | U.S. Government and Agency [Member] | Other Long-term Investments [Member]    
Assets:    
Investments 0 0
Significant Other Observable Inputs (Level 2) [Member]    
Assets:    
Cash and cash equivalents 50,914 23,636
Total assets 1,189,850 333,077
Liabilities:    
Warrant liabilities 0 0
Significant Other Observable Inputs (Level 2) [Member] | Short-term Investments [Member]    
Assets:    
Investments 736,333 285,896
Significant Other Observable Inputs (Level 2) [Member] | Other Long-term Investments [Member]    
Assets:    
Investments 402,603 23,545
Significant Other Observable Inputs (Level 2) [Member] | Cash and money market funds [Member]    
Assets:    
Cash and cash equivalents [1] 0 0
Significant Other Observable Inputs (Level 2) [Member] | Corporate Notes And Bonds [Member] | Short-term Investments [Member]    
Assets:    
Investments 3,483 43,868
Significant Other Observable Inputs (Level 2) [Member] | Corporate Notes And Bonds [Member] | Other Long-term Investments [Member]    
Assets:    
Investments   1,924
Significant Other Observable Inputs (Level 2) [Member] | U.S. Government and Agency [Member]    
Assets:    
Cash and cash equivalents 50,914 23,636
Significant Other Observable Inputs (Level 2) [Member] | U.S. Government and Agency [Member] | Short-term Investments [Member]    
Assets:    
Investments 732,850 242,028
Significant Other Observable Inputs (Level 2) [Member] | U.S. Government and Agency [Member] | Other Long-term Investments [Member]    
Assets:    
Investments 402,603 21,621
Unobservable Inputs (Level 3) [Member]    
Assets:    
Cash and cash equivalents 0 0
Total assets 0 0
Liabilities:    
Warrant liabilities 1,681,933 0
Unobservable Inputs (Level 3) [Member] | Short-term Investments [Member]    
Assets:    
Investments 0 0
Unobservable Inputs (Level 3) [Member] | Other Long-term Investments [Member]    
Assets:    
Investments 0 0
Unobservable Inputs (Level 3) [Member] | Cash and money market funds [Member]    
Assets:    
Cash and cash equivalents [1] 0 0
Unobservable Inputs (Level 3) [Member] | Corporate Notes And Bonds [Member] | Short-term Investments [Member]    
Assets:    
Investments 0 0
Unobservable Inputs (Level 3) [Member] | Corporate Notes And Bonds [Member] | Other Long-term Investments [Member]    
Assets:    
Investments   0
Unobservable Inputs (Level 3) [Member] | U.S. Government and Agency [Member]    
Assets:    
Cash and cash equivalents 0 0
Unobservable Inputs (Level 3) [Member] | U.S. Government and Agency [Member] | Short-term Investments [Member]    
Assets:    
Investments 0 0
Unobservable Inputs (Level 3) [Member] | U.S. Government and Agency [Member] | Other Long-term Investments [Member]    
Assets:    
Investments $ 0 $ 0
[1] Includes money market funds associated with the Company’s overnight investment sweep account and cash collateralizing the Company’s financial guarantees and certain other obligations.