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Fair Value Measurements - Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Fair Value Measurements |  |
Total | $ 1,997 | $ 2,879
Level 1 [Member] |  |
Fair Value Measurements |  |
Total |  |
Level 2 [Member] |  |
Fair Value Measurements |  |
Total | 1,997 | 2,879
Level 3 [Member] |  |
Fair Value Measurements |  |
Total |  |
Corporate bonds and notes [Member] |  |
Fair Value Measurements |  |
Total | 1,026 | 1,338
Corporate bonds and notes [Member] | Level 1 [Member] |  |
Fair Value Measurements |  |
Total |  |
Corporate bonds and notes [Member] | Level 2 [Member] |  |
Fair Value Measurements |  |
Total | 1,026 | 1,338
Corporate bonds and notes [Member] | Level 3 [Member] |  |
Fair Value Measurements |  |
Total |  |
Municipal bonds [Member] |  |
Fair Value Measurements |  |
Total | 971 | 1,541
Municipal bonds [Member] | Level 1 [Member] |  |
Fair Value Measurements |  |
Total |  |
Municipal bonds [Member] | Level 2 [Member] |  |
Fair Value Measurements |  |
Total | 971 | 1,541
Municipal bonds [Member] | Level 3 [Member] |  |
Fair Value Measurements |  |
Total |  |

X
- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References No definition available. + Details
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- Details
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