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Cash and Marketable Securities - Components of Marketable Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 64,963	$ 90,034
Unrealized Holding Losses	(66)	(136)
Fair Value	64,897	89,898
Corporate Debt Securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	64,963	90,034
Unrealized Holding Losses	(66)	(136)
Fair Value	$ 64,897	$ 89,898

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Amount of investment in debt security measured at amortized cost (held-to-maturity).

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