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Fair Value Measurements - Summary of Financial Instruments Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Jun. 30, 2022
May 17, 2022
Dec. 31, 2021
Dec. 31, 2020
Liabilities          
Contingent consideration $ 15,000     $ 0 $ 0
Cash and cash equivalents and short-term investments 1,800,000     2,300,000  
Restricted cash 1,300     53,700  
Restricted cash and cash equivalents and restricted short-term investments 1,100,000     1,100,000  
PBSC Urban Solutions          
Liabilities          
Business combination, contingent consideration arrangements, range of outcomes, value, high   $ 15,000 $ 15,000    
Cash and Cash Equivalents and Short-Term Investments          
Liabilities          
Cash 126,500     104,800  
Fair Value Measurements on a Recurring Basis          
Financial Instruments Measured at Fair Value on a Recurring Basis          
Total unrestricted cash equivalents and short-term investments 1,537,146     1,433,781  
Total restricted cash equivalents and investments 1,133,381     1,059,969  
Marketable equity securities 1,136        
Total financial assets 2,671,663     2,493,750  
Liabilities          
Contingent consideration 15,000        
Total financial liabilities 15,000        
Fair Value Measurements on a Recurring Basis | Level 1          
Financial Instruments Measured at Fair Value on a Recurring Basis          
Total unrestricted cash equivalents and short-term investments 3,276     22,250  
Total restricted cash equivalents and investments 93,362     20,161  
Marketable equity securities 1,136        
Total financial assets 97,774     42,411  
Liabilities          
Contingent consideration 0        
Total financial liabilities 0        
Fair Value Measurements on a Recurring Basis | Level 2          
Financial Instruments Measured at Fair Value on a Recurring Basis          
Total unrestricted cash equivalents and short-term investments 1,533,870     1,411,531  
Total restricted cash equivalents and investments 1,040,019     1,039,808  
Marketable equity securities 0        
Total financial assets 2,573,889     2,451,339  
Liabilities          
Contingent consideration 0        
Total financial liabilities 0        
Fair Value Measurements on a Recurring Basis | Level 3          
Financial Instruments Measured at Fair Value on a Recurring Basis          
Total unrestricted cash equivalents and short-term investments 0     0  
Total restricted cash equivalents and investments 0     0  
Marketable equity securities 0        
Total financial assets 0     0  
Liabilities          
Contingent consideration 15,000        
Total financial liabilities 15,000        
Fair Value Measurements on a Recurring Basis | Money market funds          
Financial Instruments Measured at Fair Value on a Recurring Basis          
Total unrestricted cash equivalents and short-term investments 3,276     22,250  
Total restricted cash equivalents and investments 93,362     20,161  
Fair Value Measurements on a Recurring Basis | Money market funds | Level 1          
Financial Instruments Measured at Fair Value on a Recurring Basis          
Total unrestricted cash equivalents and short-term investments 3,276     22,250  
Total restricted cash equivalents and investments 93,362     20,161  
Fair Value Measurements on a Recurring Basis | Money market funds | Level 2          
Financial Instruments Measured at Fair Value on a Recurring Basis          
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          
Financial Instruments Measured at Fair Value on a Recurring Basis          
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          
Financial Instruments Measured at Fair Value on a Recurring Basis          
Total unrestricted cash equivalents and short-term investments 502,159     505,438  
Total restricted cash equivalents and investments 354,978     421,144  
Fair Value Measurements on a Recurring Basis | Certificates of deposit | Level 1          
Financial Instruments Measured at Fair Value on a Recurring Basis          
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          
Financial Instruments Measured at Fair Value on a Recurring Basis          
Total unrestricted cash equivalents and short-term investments 502,159     505,438  
Total restricted cash equivalents and investments 354,978     421,144  
Fair Value Measurements on a Recurring Basis | Certificates of deposit | Level 3          
Financial Instruments Measured at Fair Value on a Recurring Basis          
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          
Financial Instruments Measured at Fair Value on a Recurring Basis          
Total unrestricted cash equivalents and short-term investments 963,150     806,388  
Total restricted cash equivalents and investments 595,591     523,489  
Fair Value Measurements on a Recurring Basis | Commercial paper | Level 1          
Financial Instruments Measured at Fair Value on a Recurring Basis          
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          
Financial Instruments Measured at Fair Value on a Recurring Basis          
Total unrestricted cash equivalents and short-term investments 963,150     806,388  
Total restricted cash equivalents and investments 595,591     523,489  
Fair Value Measurements on a Recurring Basis | Commercial paper | Level 3          
Financial Instruments Measured at Fair Value on a Recurring Basis          
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          
Financial Instruments Measured at Fair Value on a Recurring Basis          
Total unrestricted cash equivalents and short-term investments 61,501     99,705  
Total restricted cash equivalents and investments 14,916     63,458  
Fair Value Measurements on a Recurring Basis | Corporate bonds | Level 1          
Financial Instruments Measured at Fair Value on a Recurring Basis          
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          
Financial Instruments Measured at Fair Value on a Recurring Basis          
Total unrestricted cash equivalents and short-term investments 61,501     99,705  
Total restricted cash equivalents and investments 14,916     63,458  
Fair Value Measurements on a Recurring Basis | Corporate bonds | Level 3          
Financial Instruments Measured at Fair Value on a Recurring Basis          
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          
Financial Instruments Measured at Fair Value on a Recurring Basis          
Total unrestricted cash equivalents and short-term investments 7,060        
Total restricted cash equivalents and investments 74,534     31,717  
Fair Value Measurements on a Recurring Basis | U.S. government securities | Level 1          
Financial Instruments Measured at Fair Value on a Recurring Basis          
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          
Financial Instruments Measured at Fair Value on a Recurring Basis          
Total unrestricted cash equivalents and short-term investments 7,060        
Total restricted cash equivalents and investments 74,534     31,717  
Fair Value Measurements on a Recurring Basis | U.S. government securities | Level 3          
Financial Instruments Measured at Fair Value on a Recurring Basis          
Total unrestricted cash equivalents and short-term investments 0        
Total restricted cash equivalents and investments 0     0  
Fair Value, Nonrecurring          
Liabilities          
Cash       104,800  
Money market deposit accounts       330,300  
Restricted cash 1,300     53,700  
Fair Value, Nonrecurring | Cash and Cash Equivalents and Short-Term Investments          
Liabilities          
Cash 126,500        
Money market deposit accounts 127,000        
Term deposits 5,000     385,000  
Fair Value, Nonrecurring | Restricted Cash and Cash Equivalents and Restricted Investments          
Liabilities          
Term deposits $ 3,500     $ 5,000