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The Company and Basis of Presentation (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]          
Cash and cash equivalents $ 928,327   $ 928,327   $ 532,756
Net loss $ (117,321) $ (61,854) $ (208,962) $ (128,218)