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Marketable Securities - Available-for-sale Securities by Major Security Type (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Marketable Securities |  |
Amortized cost | $ 3,007 | $ 2,848
Gross unrealized holding gains | 8 | 31
Gross unrealized holding losses | (5) |
Estimated fair value | 3,010 | 2,879
Corporate bonds and notes |  |
Marketable Securities |  |
Amortized cost | 1,434 | 1,312
Gross unrealized holding gains | 8 | 26
Gross unrealized holding losses | (2) |
Estimated fair value | 1,440 | 1,338
Municipal bonds |  |
Marketable Securities |  |
Amortized cost | 1,573 | 1,536
Gross unrealized holding gains |  | 5
Gross unrealized holding losses | (3) |
Estimated fair value | $ 1,570 | $ 1,541

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- Definition The amount of accumulated gross unrealized gain on investment in marketable securities classified as available-for-sale securities. + References No definition available. + Details
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- Definition The amount of accumulated gross unrealized loss on investment in marketable securities classified as available-for-sale securities. + References No definition available. + Details
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- Definition The amount of amortized cost of marketable securities classified as available-for-sale securities. + References No definition available. + Details
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- Definition Amount of investment in marketable security. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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