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FAIR VALUE OF CERTAIN FINANCIAL ASSETS AND LIABILITIES - Assets - Recurring Basis (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
Fair value of certain financial assets and liabilities          
Cash and cash equivalents $ 888,247 $ 888,247 $ 637,513 $ 659,687 $ 528,622
Short-term investments 357,988 357,988 320,650    
Investments 7,006 7,006      
Asset transfers between Level 1 and Level 2 measurements 0 0 0    
Total fair value          
Fair value of certain financial assets and liabilities          
Cash 506,563 506,563 393,936    
Assets measured at fair value 1,253,126 1,253,126 957,671    
Foreign currency derivatives (115) (115)      
Cash and cash equivalents 888,247 888,247 637,513    
Short-term investments 357,988 357,988 320,650    
Accounts receivable, net 32 32 43    
Investments 7,006 7,006      
Accrued liabilities (147) (147) (535)    
Foreign currency derivatives     (492)    
Total fair value | Money market funds          
Fair value of certain financial assets and liabilities          
Assets measured at fair value 268,831 268,831 191,358    
Total fair value | Certificates of deposit          
Fair value of certain financial assets and liabilities          
Assets measured at fair value 57,552 57,552 14,075    
Total fair value | Commercial paper          
Fair value of certain financial assets and liabilities          
Assets measured at fair value 77,178 77,178 60,422    
Total fair value | Variable rate demand notes          
Fair value of certain financial assets and liabilities          
Assets measured at fair value 23,275 23,275 4,005    
Total fair value | Municipal securities          
Fair value of certain financial assets and liabilities          
Assets measured at fair value 143,063 143,063 177,118    
Total fair value | U.S. government agency securities          
Fair value of certain financial assets and liabilities          
Assets measured at fair value 41,122 41,122 39,092    
Total fair value | U.S. treasuries          
Fair value of certain financial assets and liabilities          
Assets measured at fair value 135,657 135,657 78,157    
Level 1          
Fair value of certain financial assets and liabilities          
Cash 506,563 506,563 393,936    
Assets measured at fair value 775,394 775,394 585,294    
Cash and cash equivalents 775,394 775,394 585,294    
Level 1 | Money market funds          
Fair value of certain financial assets and liabilities          
Assets measured at fair value 268,831 268,831 191,358    
Level 2          
Fair value of certain financial assets and liabilities          
Assets measured at fair value 477,732 477,732 372,377    
Foreign currency derivatives (115) (115)      
Cash and cash equivalents 112,853 112,853 52,219    
Short-term investments 357,988 357,988 320,650    
Accounts receivable, net 32 32 43    
Investments 7,006 7,006      
Accrued liabilities (147) (147) (535)    
Foreign currency derivatives     (492)    
Level 2 | Certificates of deposit          
Fair value of certain financial assets and liabilities          
Assets measured at fair value 57,552 57,552 14,075    
Level 2 | Commercial paper          
Fair value of certain financial assets and liabilities          
Assets measured at fair value 77,178 77,178 60,422    
Level 2 | Variable rate demand notes          
Fair value of certain financial assets and liabilities          
Assets measured at fair value 23,275 23,275 4,005    
Level 2 | Municipal securities          
Fair value of certain financial assets and liabilities          
Assets measured at fair value 143,063 143,063 177,118    
Level 2 | U.S. government agency securities          
Fair value of certain financial assets and liabilities          
Assets measured at fair value 41,122 41,122 39,092    
Level 2 | U.S. treasuries          
Fair value of certain financial assets and liabilities          
Assets measured at fair value $ 135,657 $ 135,657 $ 78,157