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FAIR VALUE OF CERTAIN FINANCIAL ASSETS AND LIABILITIES - Assets - Recurring Basis (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Fair value of certain financial assets and liabilities        
Cash and cash equivalents $ 717,617 $ 637,513 $ 713,714 $ 528,622
Short-term investments 587,356 320,650    
Investments 14,370      
Asset transfers between Level 1 and Level 2 measurements 0 0    
Total fair value        
Fair value of certain financial assets and liabilities        
Cash 557,925 393,936    
Foreign currency derivatives 30      
Assets measured at fair value 1,319,373 957,671    
Cash and cash equivalents 717,617 637,513    
Short-term investments 587,356 320,650    
Accounts receivable, net 168 43    
Investments 14,370      
Accrued liabilities (138) (535)    
Foreign currency derivatives   (492)    
Total fair value | Money market funds        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 69,362 191,358    
Total fair value | Certificates of deposit        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 11,533 14,075    
Total fair value | Commercial paper        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 95,972 60,422    
Total fair value | Variable rate demand notes        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 29,347 4,005    
Total fair value | Municipal securities        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 159,884 177,118    
Total fair value | U.S. government agency securities        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 80,879 39,092    
Total fair value | U.S. treasuries        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 314,441 78,157    
Level 1        
Fair value of certain financial assets and liabilities        
Cash 557,925 393,936    
Assets measured at fair value 627,287 585,294    
Cash and cash equivalents 627,287 585,294    
Level 1 | Money market funds        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 69,362 191,358    
Level 2        
Fair value of certain financial assets and liabilities        
Foreign currency derivatives 30      
Assets measured at fair value 692,086 372,377    
Cash and cash equivalents 90,330 52,219    
Short-term investments 587,356 320,650    
Accounts receivable, net 168 43    
Investments 14,370      
Accrued liabilities (138) (535)    
Foreign currency derivatives   (492)    
Level 2 | Certificates of deposit        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 11,533 14,075    
Level 2 | Commercial paper        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 95,972 60,422    
Level 2 | Variable rate demand notes        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 29,347 4,005    
Level 2 | Municipal securities        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 159,884 177,118    
Level 2 | U.S. government agency securities        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 80,879 39,092    
Level 2 | U.S. treasuries        
Fair value of certain financial assets and liabilities        
Assets measured at fair value $ 314,441 $ 78,157