Fair Value Measurements - Schedule of Investments Classified as Available for Sale Securities with Contractual Maturities (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Fair Value Disclosures [Abstract]
Cash and cash equivalents	$ 285,185	$ 57,937
Short-term investments (due within one year)	177,288	130,333	[1]
Total cash, cash equivalents and investments in marketable securities	$ 462,473	$ 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.