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Fair Value Measurements - Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Fair Value Measurements
Total	$ 940	$ 3,010
Level 1 [Member]
Fair Value Measurements
Total	0	0
Level 2 [Member]
Fair Value Measurements
Total	940	3,010
Level 3 [Member]
Fair Value Measurements
Total	0	0
Corporate bonds and notes [Member]
Fair Value Measurements
Total	499	1,440
Corporate bonds and notes [Member] | Level 1 [Member]
Fair Value Measurements
Total	0	0
Corporate bonds and notes [Member] | Level 2 [Member]
Fair Value Measurements
Total	499	1,440
Corporate bonds and notes [Member] | Level 3 [Member]
Fair Value Measurements
Total	0	0
Municipal bonds [Member]
Fair Value Measurements
Total	441	1,570
Municipal bonds [Member] | Level 1 [Member]
Fair Value Measurements
Total	0	0
Municipal bonds [Member] | Level 2 [Member]
Fair Value Measurements
Total	441	1,570
Municipal bonds [Member] | Level 3 [Member]
Fair Value Measurements
Total	$ 0	$ 0

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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

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