Fair Value Measurements of Financial Instruments - Summary of Contractual Maturities of Available-for-sale Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Available For Sale Securities [Abstract]
Amortized Cost, Due in one year or less	$ 20,662
Amortized Cost, Due between one to two years	4,711
Amortized Cost	25,373	$ 21,935
Estimated Fair Value, Due in one year or less	20,727
Estimated Fair Value, Due between one to two years	4,730
Estimated Fair Value	$ 25,457	$ 21,920

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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