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Marketable Securities - Summary of Fair Values of Marketable Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Available For Sale Securities Debt Maturities Fair Value [Abstract]    
Maturities within one year $ 98,346 $ 114,386
Maturities after one year through three years 5,900 48,556
Debt securities, Available-for-sale $ 104,246 $ 162,942