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Cash, Cash Equivalents, Marketable Securities, and Restricted Cash - Cash, Cash Equivalents, And Restricted Cash (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Cash, Cash Equivalents, and Short-term Investments [Abstract]        
Cash and cash equivalents $ 385,903 $ 163,240 $ 210,631  
Restricted cash 3,168   2,794  
Cash, cash equivalents, and restricted cash shown in the Consolidated Statements of Cash Flows $ 389,071 $ 166,162 $ 213,425 $ 146,341