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Investment Securities - Summary of Cost, Gross Unrealized Holding Gains and Losses, Allowances for Credit Losses and Fair Value of Available-for-Sale Investments by Types, Maturities and Classes of Securities (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Schedule Of Available For Sale Securities [Line Items]
Debt securities, Amortized Cost	$ 85,230	$ 85,739
Debt securities, Unrealized Losses	(1,322)	(244)
Debt securities, Estimated Fair Value	$ 83,908	$ 85,495
Certificates of Deposit | Within 1 Year
Schedule Of Available For Sale Securities [Line Items]
Debt securities, Maturity	Within 1 year	Within 1 year
Debt securities, Amortized Cost	$ 3,098	$ 2,896
Debt securities, Unrealized Losses	(9)	(3)
Debt securities, Estimated Fair Value	$ 3,089	$ 2,893
Certificates of Deposit | 1 Year to 2 Years
Schedule Of Available For Sale Securities [Line Items]
Debt securities, Maturity	1 year to 2 years	1 year to 2 years
Debt securities, Amortized Cost	$ 2,188	$ 2,887
Debt securities, Unrealized Losses	(33)	(9)
Debt securities, Estimated Fair Value	$ 2,155	$ 2,878
U.S. Treasury Securities | Within 1 Year
Schedule Of Available For Sale Securities [Line Items]
Debt securities, Maturity	Within 1 year	Within 1 year
Debt securities, Amortized Cost	$ 30,083	$ 15,045
Debt securities, Unrealized Losses	(254)	(23)
Debt securities, Estimated Fair Value	$ 29,829	$ 15,022
U.S. Treasury Securities | 1 Year to 2 Years
Schedule Of Available For Sale Securities [Line Items]
Debt securities, Maturity	1 year to 2 years	1 year to 2 years
Debt securities, Amortized Cost	$ 49,861	$ 64,911
Debt securities, Unrealized Losses	(1,026)	(209)
Debt securities, Estimated Fair Value	$ 48,835	$ 64,702

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Debt securities, available-for-sale, maturity.

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Amount, before tax, of unrealized loss 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).

+ References

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-Publisher FASB
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-Topic 320
-SubTopic 10
-Section 50
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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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-Topic 320
-SubTopic 10
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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), classified as current.

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