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CONSOLIDATED FINANCIAL STATEMENT DETAILS - Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]        
Cash and cash equivalents $ 812,705 $ 390,565    
Restricted cash included in other current assets 407 504    
Restricted cash included in other non-current assets 449 409    
Total cash and cash equivalents and restricted cash as shown on the consolidated statement of cash flows $ 813,561 $ 391,478 $ 338,821 $ 221,521