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FAIR VALUE OF CERTAIN FINANCIAL ASSETS AND LIABILITIES (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Fair value of certain financial assets and liabilities    
Cash and cash equivalents $ 1,014,786 $ 1,326,462
Short-term investments 1,717,648 1,749,727
Investments 65,652 99,419
Asset transfers between Level 1 and Level 2 measurements 0 0
Total fair value    
Fair value of certain financial assets and liabilities    
Cash 748,324 749,089
Foreign currency derivatives (4,483) (278)
Assets measured at fair value 2,793,603 3,175,330
Cash and cash equivalents 1,014,786 1,326,462
Short-term investments 1,717,648 1,749,727
Accounts receivable, net 239 654
Investments 65,652 99,419
Accrued liabilities (4,722) (932)
Total fair value | Money market funds    
Fair value of certain financial assets and liabilities    
Assets measured at fair value 138,161 440,826
Total fair value | Certificates of deposit    
Fair value of certain financial assets and liabilities    
Assets measured at fair value 38,411 44,502
Total fair value | Commercial paper    
Fair value of certain financial assets and liabilities    
Assets measured at fair value 290,410 335,477
Total fair value | Municipal securities    
Fair value of certain financial assets and liabilities    
Assets measured at fair value 202,667 2,428
Total fair value | U.S. government agency securities    
Fair value of certain financial assets and liabilities    
Assets measured at fair value 99,786 75,137
Total fair value | U.S. treasuries    
Fair value of certain financial assets and liabilities    
Assets measured at fair value 1,280,327 1,528,149
Level 1    
Fair value of certain financial assets and liabilities    
Cash 748,324 749,089
Assets measured at fair value 886,485 1,189,915
Cash and cash equivalents 886,485 1,189,915
Level 1 | Money market funds    
Fair value of certain financial assets and liabilities    
Assets measured at fair value 138,161 440,826
Level 2    
Fair value of certain financial assets and liabilities    
Foreign currency derivatives (4,483) (278)
Assets measured at fair value 1,907,118 1,985,415
Cash and cash equivalents 128,301 136,547
Short-term investments 1,717,648 1,749,727
Accounts receivable, net 239 654
Investments 65,652 99,419
Accrued liabilities (4,722) (932)
Level 2 | Certificates of deposit    
Fair value of certain financial assets and liabilities    
Assets measured at fair value 38,411 44,502
Level 2 | Commercial paper    
Fair value of certain financial assets and liabilities    
Assets measured at fair value 290,410 335,477
Level 2 | Municipal securities    
Fair value of certain financial assets and liabilities    
Assets measured at fair value 202,667 2,428
Level 2 | U.S. government agency securities    
Fair value of certain financial assets and liabilities    
Assets measured at fair value 99,786 75,137
Level 2 | U.S. treasuries    
Fair value of certain financial assets and liabilities    
Assets measured at fair value $ 1,280,327 $ 1,528,149