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Fair Value Measurements - Summary of Financial Instruments Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Sep. 30, 2021
Assets      
Total unrestricted and restricted cash equivalents and investments $ 2,822,800 $ 3,214,049  
Liabilities      
Contingent consideration 15,000   $ 0
Fair Value Measurements on a Recurring Basis      
Assets      
Total unrestricted cash equivalents and short-term investments 1,639,378 1,433,781  
Total restricted cash equivalents and investments 1,112,058 1,059,969  
Marketable equity securities 4,919    
Total unrestricted and restricted cash equivalents and investments   2,493,750  
Total financial assets 2,756,355    
Liabilities      
Contingent consideration 15,000    
Total financial liabilities 15,000    
Fair Value Measurements on a Recurring Basis | Level 1      
Assets      
Total unrestricted cash equivalents and short-term investments 1,885 22,250  
Total restricted cash equivalents and investments 91,231 20,161  
Marketable equity securities 4,919    
Total unrestricted and restricted cash equivalents and investments   42,411  
Total financial assets 98,035    
Liabilities      
Contingent consideration 0    
Total financial liabilities 0    
Fair Value Measurements on a Recurring Basis | Level 2      
Assets      
Total unrestricted cash equivalents and short-term investments 1,637,493 1,411,531  
Total restricted cash equivalents and investments 1,020,827 1,039,808  
Marketable equity securities 0    
Total unrestricted and restricted cash equivalents and investments   2,451,339  
Total financial assets 2,658,320    
Liabilities      
Contingent consideration 0    
Total financial liabilities 0    
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  
Marketable equity securities 0    
Total unrestricted and restricted cash equivalents and investments   0  
Total financial assets 0    
Liabilities      
Contingent consideration 15,000    
Total financial liabilities 15,000    
Fair Value Measurements on a Recurring Basis | Money market funds      
Assets      
Total unrestricted cash equivalents and short-term investments 1,885 22,250  
Total restricted cash equivalents and investments 91,231 20,161  
Fair Value Measurements on a Recurring Basis | Money market funds | Level 1      
Assets      
Total unrestricted cash equivalents and short-term investments 1,885 22,250  
Total restricted cash equivalents and investments 91,231 20,161  
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 429,359 505,438  
Total restricted cash equivalents and investments 269,287 421,144  
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 429,359 505,438  
Total restricted cash equivalents and investments 269,287 421,144  
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 1,083,272 806,388  
Total restricted cash equivalents and investments 659,193 523,489  
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 1,083,272 806,388  
Total restricted cash equivalents and investments 659,193 523,489  
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 85,146 99,705  
Total restricted cash equivalents and investments 29,007 63,458  
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 0  
Fair Value Measurements on a Recurring Basis | Corporate bonds | Level 2      
Assets      
Total unrestricted cash equivalents and short-term investments 85,146 99,705  
Total restricted cash equivalents and investments 29,007 63,458  
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 0  
Fair Value Measurements on a Recurring Basis | U.S. government securities      
Assets      
Total unrestricted cash equivalents and short-term investments 39,716    
Total restricted cash equivalents and investments 63,340 31,717  
Fair Value Measurements on a Recurring Basis | U.S. government securities | Level 1      
Assets      
Total unrestricted cash equivalents and short-term investments 0    
Total restricted cash equivalents and investments 0 0  
Fair Value Measurements on a Recurring Basis | U.S. government securities | Level 2      
Assets      
Total unrestricted cash equivalents and short-term investments 39,716    
Total restricted cash equivalents and investments 63,340 31,717  
Fair Value Measurements on a Recurring Basis | U.S. government securities | Level 3      
Assets      
Total unrestricted cash equivalents and short-term investments 0    
Total restricted cash equivalents and investments $ 0 $ 0