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Marketable Securities - Summary of Fair Values of Marketable Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Available For Sale Securities Debt Maturities Fair Value [Abstract]    
Maturities within one year $ 65,830 $ 88,898
Maturities after one year through three years   1,893
Total marketable securities $ 65,830 $ 90,791