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Fair Value Measurements - Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Assets: |  |
Total | $ 3,010 | $ 2,879
Level 1 |  |
Assets: |  |
Total |  |
Level 2 |  |
Assets: |  |
Total | 3,010 | 2,879
Level 3 |  |
Assets: |  |
Total |  |
Corporate bonds and notes |  |
Assets: |  |
Total | 1,440 | 1,338
Corporate bonds and notes | Level 1 |  |
Assets: |  |
Total |  |
Corporate bonds and notes | Level 2 |  |
Assets: |  |
Total | 1,440 | 1,338
Corporate bonds and notes | Level 3 |  |
Assets: |  |
Total |  |
Municipal bonds |  |
Assets: |  |
Total | 1,570 | 1,541
Municipal bonds | Level 1 |  |
Assets: |  |
Total |  |
Municipal bonds | Level 2 |  |
Assets: |  |
Total | 1,570 | 1,541
Municipal bonds | Level 3 |  |
Assets: |  |
Total |  |

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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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