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Marketable Securities - Summary of Investments (Details) $ in Thousands	Dec. 31, 2020 USD ($) security	Dec. 31, 2019 USD ($) security
Marketable securities available-for-sale
Amortization Cost	$ 180,675	$ 121,103
Gross Unrealized Gains	7	39
Gross Unrealized Losses	(9)	(2)
Estimated Fair Value	180,673	121,140
Aggregate fair value of marketable securities with unrealized gains (losses) position for less than a year	$ 45,700	$ 19,600
Number of investments in an unrealized loss position for less than a year | security	5	3
U.S. Treasury obligations
Marketable securities available-for-sale
Amortization Cost	$ 180,675	$ 121,103
Gross Unrealized Gains	7	39
Gross Unrealized Losses	(9)	(2)
Estimated Fair Value	$ 180,673	$ 121,140

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