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Fair Value Measurements - Schedule of Financial Instruments Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Assets    
Cash $ 527,400 $ 439,200
Short-term investments 656,573 705,172
Cash and cash equivalents and short-term investments 1,800,000 1,800,000
Restricted cash 3,100 3,000
Restricted cash and cash equivalents and restricted investments 2,100,000 1,900,000
Fair Value Measurements on a Recurring Basis    
Assets    
Total unrestricted cash equivalents and short-term investments 904,316 1,037,844
Total restricted cash equivalents and investments 2,061,607 1,933,098
Total financial assets 2,965,923 2,970,942
Fair Value Measurements on a Recurring Basis | Level 1    
Assets    
Total unrestricted cash equivalents and short-term investments 201,464 276,077
Total restricted cash equivalents and investments 35,314 47,264
Total financial assets 236,778 323,341
Fair Value Measurements on a Recurring Basis | Level 2    
Assets    
Total unrestricted cash equivalents and short-term investments 702,852 761,767
Total restricted cash equivalents and investments 2,026,293 1,885,834
Total financial assets 2,729,145 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 201,464 276,077
Total restricted cash equivalents and investments 35,314 47,264
Fair Value Measurements on a Recurring Basis | Money market funds | Level 1    
Assets    
Total unrestricted cash equivalents and short-term investments 201,464 276,077
Total restricted cash equivalents and investments 35,314 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 158,964 143,471
Total restricted cash equivalents and investments 13,309 104,370
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 158,964 143,471
Total restricted cash equivalents and investments 13,309 104,370
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 166,001 216,525
Total restricted cash equivalents and investments 1,243,311 922,364
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 166,001 216,525
Total restricted cash equivalents and investments 1,243,311 922,364
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 319,128 267,491
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 319,128 267,491
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 58,759 134,280
Total restricted cash equivalents and investments 769,673 844,063
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 58,759 134,280
Total restricted cash equivalents and investments 769,673 844,063
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    
Assets    
Cash 527,400 439,200
Fair Value Measurements on Nonrecurring Basis | Money market funds    
Assets    
Short-term investments $ 362,800 $ 360,100