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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
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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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- Definition 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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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- Definition 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 -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 + Details
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