Investment Securities (Maturity Dates of Marketable Debt Securities) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 103,906	$ 91,204
U.S. Government securities
Debt Securities, Available-for-sale [Line Items]
Fair Value	6,481
Under 1 Year	5,688
1 Year up to 5 Years	793
More than 5 Years	0
Corporate securities
Debt Securities, Available-for-sale [Line Items]
Fair Value	47,531
Under 1 Year	20,028
1 Year up to 5 Years	27,503
More than 5 Years	0
U.S. mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Fair Value	19,572
Under 1 Year	1,824
1 Year up to 5 Years	17,748
More than 5 Years	0
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Fair Value	29,103
Under 1 Year	29,103
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	1,219
Under 1 Year	1,219
1 Year up to 5 Years	0
More than 5 Years	0
Total debt securities available for sale by maturity dates
Debt Securities, Available-for-sale [Line Items]
Fair Value	103,906
Under 1 Year	57,862
1 Year up to 5 Years	46,044
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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