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Fair Value Measurements - Schedule of fair value on a recurring basis (Details) - Fair Value, Recurring [Member] - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Fair Value, Inputs, Level 1 [Member]
Assets:
Money market funds	$ 2,090	$ 2,442
Mutual funds	17,481	18,542
Fair Value, Inputs, Level 2 [Member]
Assets:
Short-term investments	$ 89,576	$ 99,715

X

- Definition

Fair value of money market funds.

+ References

No definition available.

+ Details

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X

- Definition

Mutual funds fair value disclosure.

+ References

No definition available.

+ Details

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- References

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X

- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

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