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Fair Value Measurements - Schedule of Investments Classified as Available for Sale Securities with Contractual Maturities (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Fair Value Disclosures [Abstract]    
Cash and Cash equivalents $ 76,068 $ 71,064
Short-term investments (due within one year) 148,330 185,480 [1]
Long-term investments (due between one and two years) 0 3,181 [1]
Total cash and investments in marketable securities $ 224,398 $ 259,725
[1] The Condensed Consolidated Balance Sheet as of December 31, 2018 has been derived from the audited financial statements as of that date.