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Marketable Securities (Details) - USD ($)	Sep. 30, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 108,371,000	$ 91,407,000
Gross Unrealized Gains	3,000	3,000
Gross Unrealized Losses	(7,000)	(10,000)
Fair Value	108,367,000	91,400,000
Allowance for credit loss related to available-for-sale debt securities	0	0
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	68,019,000	60,630,000
Gross Unrealized Gains	2,000	1,000
Gross Unrealized Losses	(4,000)	(7,000)
Fair Value	68,017,000	60,624,000
Government-sponsored enterprises
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	12,278,000
Gross Unrealized Gains	1,000
Gross Unrealized Losses	0
Fair Value	12,279,000
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	28,074,000	30,777,000
Gross Unrealized Gains	0	2,000
Gross Unrealized Losses	(3,000)	(3,000)
Fair Value	$ 28,071,000	$ 30,776,000

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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