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Marketable Securities - Schedule of Fair Value and Amortized Cost of Company's Available-for-Sale Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Investments Debt And Equity Securities [Abstract]    
Due in one year or less, Amortized Cost $ 93,532 $ 101,027
Total, Amortized Cost 93,532 101,027
Due in one year or less, Fair Value 93,641 100,986
Total, Fair Value $ 93,641 $ 100,986