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Cash and Marketable Securities - Schedule of Restricted Cash and Cash Equivalents (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Dec. 31, 2018
Cash and Cash Equivalents [Abstract]        
Cash and cash equivalents $ 351,047 $ 79,449 $ 82,673 $ 77,123
Restricted cash included within other non-current assets 1,500 1,500 1,500 1,500
Total cash, cash equivalents, and restricted cash $ 352,547 $ 80,949 $ 84,173 $ 78,623