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The Company and Basis of Presentation (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]          
Cash and cash equivalents $ 846,556   $ 846,556   $ 532,756
Net loss $ (112,714) $ (63,659) $ (321,676) $ (191,877)