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FAIR VALUE OF CERTAIN FINANCIAL ASSETS AND LIABILITIES (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Fair value of certain financial assets and liabilities        
Cash and cash equivalents $ 1,178,879 $ 1,180,413 $ 701,836 $ 797,957
Short-term investments 980,108 881,354    
Investments 63,751 44,291    
Asset transfers between Level 1 and Level 2 measurements 0 0    
Total fair value        
Fair value of certain financial assets and liabilities        
Cash 809,464 796,421    
Assets measured at fair value 2,222,444 2,103,480    
Cash and cash equivalents 1,178,879 1,180,413    
Short-term investments 980,108 881,354    
Accounts receivable, net 173 69    
Investments 63,751 44,291    
Accrued liabilities (467) (2,647)    
Foreign currency derivatives (292) (2,578)    
Total fair value | Money market funds        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 351,514 352,730    
Total fair value | Certificates of deposit        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 40,520 23,137    
Total fair value | Commercial paper        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 166,306 130,883    
Total fair value | Municipal securities        
Fair value of certain financial assets and liabilities        
Assets measured at fair value   9,083    
Total fair value | U.S. government agency securities        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 95,794 91,882    
Total fair value | U.S. treasuries        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 759,138 701,922    
Level 1        
Fair value of certain financial assets and liabilities        
Cash 809,464 796,421    
Assets measured at fair value 1,160,978 1,149,151    
Cash and cash equivalents 1,160,978 1,149,151    
Level 1 | Money market funds        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 351,514 352,730    
Level 2        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 1,061,466 954,329    
Cash and cash equivalents 17,901 31,262    
Short-term investments 980,108 881,354    
Accounts receivable, net 173 69    
Investments 63,751 44,291    
Accrued liabilities (467) (2,647)    
Foreign currency derivatives (292) (2,578)    
Level 2 | Certificates of deposit        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 40,520 23,137    
Level 2 | Commercial paper        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 166,306 130,883    
Level 2 | Municipal securities        
Fair value of certain financial assets and liabilities        
Assets measured at fair value   9,083    
Level 2 | U.S. government agency securities        
Fair value of certain financial assets and liabilities        
Assets measured at fair value 95,794 91,882    
Level 2 | U.S. treasuries        
Fair value of certain financial assets and liabilities        
Assets measured at fair value $ 759,138 $ 701,922