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Fair Value Measurements - Schedule of Financial Instruments Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Assets    
Cash $ 461,300 $ 439,200
Short-term investments 686,066 705,172
Cash and cash equivalents and short-term investments 1,700,000 1,800,000
Restricted cash 3,000 3,000
Restricted cash and cash equivalents and restricted investments 2,000,000 1,900,000
Fair Value Measurements on a Recurring Basis    
Assets    
Total unrestricted cash equivalents and short-term investments 896,263 1,037,844
Total restricted cash equivalents and investments 1,995,264 1,933,098
Total financial assets 2,891,527 2,970,942
Fair Value Measurements on a Recurring Basis | Level 1    
Assets    
Total unrestricted cash equivalents and short-term investments 165,585 276,077
Total restricted cash equivalents and investments 29,594 47,264
Total financial assets 195,179 323,341
Fair Value Measurements on a Recurring Basis | Level 2    
Assets    
Total unrestricted cash equivalents and short-term investments 730,678 761,767
Total restricted cash equivalents and investments 1,965,670 1,885,834
Total financial assets 2,696,348 2,647,601
Fair Value Measurements on a Recurring Basis | Level 3    
Assets    
Total unrestricted cash equivalents and short-term investments 0 0
Total restricted cash equivalents and investments 0 0
Total financial assets 0 0
Fair Value Measurements on a Recurring Basis | Money market funds    
Assets    
Total unrestricted cash equivalents and short-term investments 165,585 276,077
Total restricted cash equivalents and investments 29,594 47,264
Fair Value Measurements on a Recurring Basis | Money market funds | Level 1    
Assets    
Total unrestricted cash equivalents and short-term investments 165,585 276,077
Total restricted cash equivalents and investments 29,594 47,264
Fair Value Measurements on a Recurring Basis | Money market funds | Level 2    
Assets    
Total unrestricted cash equivalents and short-term investments 0 0
Total restricted cash equivalents and investments 0 0
Fair Value Measurements on a Recurring Basis | Money market funds | Level 3    
Assets    
Total unrestricted cash equivalents and short-term investments 0 0
Total restricted cash equivalents and investments 0 0
Fair Value Measurements on a Recurring Basis | Certificates of deposit    
Assets    
Total unrestricted cash equivalents and short-term investments 160,023 143,471
Total restricted cash equivalents and investments 53,969 104,370
Fair Value Measurements on a Recurring Basis | Certificates of deposit | Level 1    
Assets    
Total unrestricted cash equivalents and short-term investments 0 0
Total restricted cash equivalents and investments 0 0
Fair Value Measurements on a Recurring Basis | Certificates of deposit | Level 2    
Assets    
Total unrestricted cash equivalents and short-term investments 160,023 143,471
Total restricted cash equivalents and investments 53,969 104,370
Fair Value Measurements on a Recurring Basis | Certificates of deposit | Level 3    
Assets    
Total unrestricted cash equivalents and short-term investments 0 0
Total restricted cash equivalents and investments 0 0
Fair Value Measurements on a Recurring Basis | Commercial paper    
Assets    
Total unrestricted cash equivalents and short-term investments 176,741 216,525
Total restricted cash equivalents and investments 1,064,040 922,364
Fair Value Measurements on a Recurring Basis | Commercial paper | Level 1    
Assets    
Total unrestricted cash equivalents and short-term investments 0 0
Total restricted cash equivalents and investments 0 0
Fair Value Measurements on a Recurring Basis | Commercial paper | Level 2    
Assets    
Total unrestricted cash equivalents and short-term investments 176,741 216,525
Total restricted cash equivalents and investments 1,064,040 922,364
Fair Value Measurements on a Recurring Basis | Commercial paper | Level 3    
Assets    
Total unrestricted cash equivalents and short-term investments 0 0
Total restricted cash equivalents and investments 0 0
Fair Value Measurements on a Recurring Basis | Corporate bonds    
Assets    
Total unrestricted cash equivalents and short-term investments 316,419 267,491
Total restricted cash equivalents and investments   15,037
Fair Value Measurements on a Recurring Basis | Corporate bonds | Level 1    
Assets    
Total unrestricted cash equivalents and short-term investments 0 0
Total restricted cash equivalents and investments   0
Fair Value Measurements on a Recurring Basis | Corporate bonds | Level 2    
Assets    
Total unrestricted cash equivalents and short-term investments 316,419 267,491
Total restricted cash equivalents and investments   15,037
Fair Value Measurements on a Recurring Basis | Corporate bonds | Level 3    
Assets    
Total unrestricted cash equivalents and short-term investments 0 0
Total restricted cash equivalents and investments   0
Fair Value Measurements on a Recurring Basis | U.S. government and agency securities    
Assets    
Total unrestricted cash equivalents and short-term investments 77,495 134,280
Total restricted cash equivalents and investments 847,661 844,063
Fair Value Measurements on a Recurring Basis | U.S. government and agency securities | Level 1    
Assets    
Total unrestricted cash equivalents and short-term investments 0 0
Total restricted cash equivalents and investments 0 0
Fair Value Measurements on a Recurring Basis | U.S. government and agency securities | Level 2    
Assets    
Total unrestricted cash equivalents and short-term investments 77,495 134,280
Total restricted cash equivalents and investments 847,661 844,063
Fair Value Measurements on a Recurring Basis | U.S. government and agency securities | Level 3    
Assets    
Total unrestricted cash equivalents and short-term investments 0 0
Total restricted cash equivalents and investments 0 0
Fair Value Measurements on Nonrecurring Basis | Cash and Cash Equivalents and Short-Term Investments    
Assets    
Cash 461,300 439,200
Fair Value Measurements on Nonrecurring Basis | Cash and Cash Equivalents and Short-Term Investments | Money market funds    
Assets    
Short-term investments $ 363,300 $ 360,100