Investment Securities (Maturity Dates of Marketable Debt Securities) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 91,838	$ 103,906
Under 1 Year	48,671
1 Year up to 5 Years	43,167
More than 5 Years	0
U.S. Government securities
Debt Securities, Available-for-sale [Line Items]
Fair Value	5,585
Under 1 Year	4,805
1 Year up to 5 Years	780
More than 5 Years	0
Corporate securities
Debt Securities, Available-for-sale [Line Items]
Fair Value	55,324
Under 1 Year	30,317
1 Year up to 5 Years	25,007
More than 5 Years	0
U.S. mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Fair Value	19,173
Under 1 Year	1,793
1 Year up to 5 Years	17,380
More than 5 Years	0
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Fair Value	10,540
Under 1 Year	10,540
1 Year up to 5 Years	0
More than 5 Years	0
Foreign fixed-income securities
Debt Securities, Available-for-sale [Line Items]
Fair Value	1,216
Under 1 Year	1,216
1 Year up to 5 Years	0
More than 5 Years	$ 0

Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of 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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