v3.26.3
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, 2026
Dec. 31, 2025
Assets:    
Cash and cash equivalents $ 217,008 $ 1,037,748
Other noncurrent assets 148,134 61,010
Prepaid expenses and other current assets 71,598  
Total assets 1,889,680 3,404,692
Liabilities:    
Warrant liabilities 2,124,224 2,471,577
Total liabilities 2,124,224 2,471,577
Short-term Investments [Member]    
Assets:    
Investments 788,458 1,361,291
Other Long-term Investments [Member]    
Assets:    
Investments 664,482 944,643
Strategic Investments [Member]    
Assets:    
Other noncurrent assets 148,134 61,010
Prepaid expenses and other current assets 71,598  
Cash and money market funds [Member]    
Assets:    
Cash and cash equivalents [1] 216,474 538,195
U.S. Government and Agency [Member]    
Assets:    
Cash and cash equivalents 0 499,553
U.S. Government and Agency [Member] | Short-term Investments [Member]    
Assets:    
Investments 788,458 1,359,292
U.S. Government and Agency [Member] | Other Long-term Investments [Member]    
Assets:    
Investments 664,482 944,643
Certificates of Deposit [Member]    
Assets:    
Cash and cash equivalents 534  
Certificates of Deposit [Member] | Short-term Investments [Member]    
Assets:    
Investments 0  
Corporate Notes And Bonds [Member] | Short-term Investments [Member]    
Assets:    
Investments   1,999
Quoted Prices in Active Markets (Level 1) [Member]    
Assets:    
Cash and cash equivalents 216,474 538,195
Other noncurrent assets 0 0
Prepaid expenses and other current assets 71,598  
Total assets 288,072 538,195
Liabilities:    
Warrant liabilities 0 44,168
Total liabilities 0 44,168
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] | Strategic Investments [Member]    
Assets:    
Other noncurrent assets 0 0
Prepaid expenses and other current assets 71,598  
Quoted Prices in Active Markets (Level 1) [Member] | Cash and money market funds [Member]    
Assets:    
Cash and cash equivalents [1] 216,474 538,195
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
Quoted Prices in Active Markets (Level 1) [Member] | Certificates of Deposit [Member]    
Assets:    
Cash and cash equivalents 0  
Quoted Prices in Active Markets (Level 1) [Member] | Certificates of Deposit [Member] | Short-term Investments [Member]    
Assets:    
Investments 0  
Quoted Prices in Active Markets (Level 1) [Member] | Corporate Notes And Bonds [Member] | Short-term Investments [Member]    
Assets:    
Investments   0
Significant Other Observable Inputs (Level 2) [Member]    
Assets:    
Cash and cash equivalents 534 499,553
Other noncurrent assets 0 0
Prepaid expenses and other current assets 0  
Total assets 1,453,474 2,805,487
Liabilities:    
Warrant liabilities 0 0
Total liabilities 0 0
Significant Other Observable Inputs (Level 2) [Member] | Short-term Investments [Member]    
Assets:    
Investments 788,458 1,361,291
Significant Other Observable Inputs (Level 2) [Member] | Other Long-term Investments [Member]    
Assets:    
Investments 664,482 944,643
Significant Other Observable Inputs (Level 2) [Member] | Strategic Investments [Member]    
Assets:    
Other noncurrent assets 0 0
Prepaid expenses and other current assets 0  
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] | U.S. Government and Agency [Member]    
Assets:    
Cash and cash equivalents 0 499,553
Significant Other Observable Inputs (Level 2) [Member] | U.S. Government and Agency [Member] | Short-term Investments [Member]    
Assets:    
Investments 788,458 1,359,292
Significant Other Observable Inputs (Level 2) [Member] | U.S. Government and Agency [Member] | Other Long-term Investments [Member]    
Assets:    
Investments 664,482 944,643
Significant Other Observable Inputs (Level 2) [Member] | Certificates of Deposit [Member]    
Assets:    
Cash and cash equivalents 534  
Significant Other Observable Inputs (Level 2) [Member] | Certificates of Deposit [Member] | Short-term Investments [Member]    
Assets:    
Investments 0  
Significant Other Observable Inputs (Level 2) [Member] | Corporate Notes And Bonds [Member] | Short-term Investments [Member]    
Assets:    
Investments   1,999
Unobservable Inputs (Level 3) [Member]    
Assets:    
Cash and cash equivalents 0 0
Other noncurrent assets 148,134 61,010
Prepaid expenses and other current assets 0  
Total assets 148,134 61,010
Liabilities:    
Warrant liabilities 2,124,224 2,427,409
Total liabilities 2,124,224 2,427,409
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] | Strategic Investments [Member]    
Assets:    
Other noncurrent assets 148,134 61,010
Prepaid expenses and other current assets 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] | 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
Unobservable Inputs (Level 3) [Member] | Certificates of Deposit [Member] | Short-term Investments [Member]    
Assets:    
Investments $ 0  
Unobservable Inputs (Level 3) [Member] | Corporate Notes And Bonds [Member] | Short-term Investments [Member]    
Assets:    
Investments   $ 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.