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Fair Value Measurements - Schedule of Investments Classified as Available for Sale Securities with Contractual Maturities (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Fair Value Disclosures [Abstract]    
Cash and cash equivalents $ 221,849 $ 57,937
Short-term investments (due within one year) 560,583 130,333 [1]
Long-term investments (due between one and two years) 2,700  
Total cash, cash equivalents and investments in marketable securities $ 785,132 $ 188,270
[1] The Condensed Consolidated Balance Sheet as of December 31, 2019 has been derived from the audited financial statements as of that date.