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Marketable Securities - (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Investments
Amortized Cost	$ 231,530,000		$ 249,897,000
Gross Unrealized Gain	337,000		854,000
Gross Unrealized Loss	(158,000)		(75,000)
Estimated Fair Value	231,709,000		250,676,000
Gross realized gains	54,000	$ 64,000
Cost Maturities:
Within 1 year	115,920,000
Between 1 to 2 years	115,610,000
Total investments available for sale	231,530,000
Fair Value Maturities:
Within 1 year	116,233,000
Between 1 to 2 years	115,476,000
Total investments available for sale	231,709,000
Corporate bonds
Investments
Amortized Cost	231,530,000		242,900,000
Gross Unrealized Gain	337,000		854,000
Gross Unrealized Loss	(158,000)		(75,000)
Estimated Fair Value	$ 231,709,000		243,679,000
Commercial Paper
Investments
Amortized Cost			6,997,000
Estimated Fair Value			$ 6,997,000

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