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Fair Value Measurements - Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Fair Value Measurements
Total	$ 1,420	$ 2,879
Level 1 [Member]
Fair Value Measurements
Total
Level 2 [Member]
Fair Value Measurements
Total	1,420	2,879
Level 3 [Member]
Fair Value Measurements
Total
Corporate bonds and notes [Member]
Fair Value Measurements
Total	819	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	819	1,338
Corporate bonds and notes [Member] | Level 3 [Member]
Fair Value Measurements
Total
Municipal bonds [Member]
Fair Value Measurements
Total	601	1,541
Municipal bonds [Member] | Level 1 [Member]
Fair Value Measurements
Total
Municipal bonds [Member] | Level 2 [Member]
Fair Value Measurements
Total	601	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

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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