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Fair Value Measurements - Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Fair Value Measurements |  |
Total | $ 3,013 | $ 4,543
Level 1 [Member] |  |
Fair Value Measurements |  |
Total |  |
Level 2 [Member] |  |
Fair Value Measurements |  |
Total | 3,013 | 4,543
Level 3 [Member] |  |
Fair Value Measurements |  |
Total |  |
Corporate bonds and notes [Member] |  |
Fair Value Measurements |  |
Total | 1,741 | 1,832
Corporate bonds and notes [Member] | Level 1 [Member] |  |
Fair Value Measurements |  |
Total |  |
Corporate bonds and notes [Member] | Level 2 [Member] |  |
Fair Value Measurements |  |
Total | 1,741 | 1,832
Corporate bonds and notes [Member] | Level 3 [Member] |  |
Fair Value Measurements |  |
Total |  |
Municipal bonds [Member] |  |
Fair Value Measurements |  |
Total | 1,272 | 2,711
Municipal bonds [Member] | Level 1 [Member] |  |
Fair Value Measurements |  |
Total |  |
Municipal bonds [Member] | Level 2 [Member] |  |
Fair Value Measurements |  |
Total | 1,272 | 2,711
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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