INVESTMENTS AND FAIR VALUE MEASUREMENTS - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) $ in Thousands	Sep. 30, 2022 USD ($) security	Dec. 31, 2021 USD ($) security
Liabilities:
Number of securities in unrealized gain position \| security	2	10
Funds Held For Clients, Restricted Cash and Debt Securities, Gross Unrealized Losses	$ (2,599)	$ (114)
Recurring
Funds held for clients
Total	58,399	33,176
Liabilities:
Contingent purchase consideration(1)	2,969	4,329
Total	2,969	4,329
Recurring \| Money Market Funds [Member]
Funds held for clients
Funds held for clients	3,120	1,116
Recurring \| Available-for-sale securities
Funds held for clients
Funds held for clients	55,279	32,060
Recurring \| Level 1
Funds held for clients
Total	3,120	1,116
Liabilities:
Contingent purchase consideration(1)	0	0
Total	0	0
Recurring \| Level 1 \| Money Market Funds [Member]
Funds held for clients
Funds held for clients	3,120	1,116
Recurring \| Level 1 \| Available-for-sale securities
Funds held for clients
Funds held for clients	0	0
Recurring \| Level 2
Funds held for clients
Total	55,279	32,060
Liabilities:
Contingent purchase consideration(1)	0	0
Total	0	0
Recurring \| Level 2 \| Money Market Funds [Member]
Funds held for clients
Funds held for clients	0	0
Recurring \| Level 2 \| Available-for-sale securities
Funds held for clients
Funds held for clients	55,279	32,060
Recurring \| Level 3
Funds held for clients
Total	0	0
Liabilities:
Contingent purchase consideration(1)	2,969	4,329
Total	2,969	4,329
Recurring \| Level 3 \| Money Market Funds [Member]
Funds held for clients
Funds held for clients	0	0
Recurring \| Level 3 \| Available-for-sale securities
Funds held for clients
Funds held for clients	$ 0	$ 0

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- Definition

Funds Held For Clients, Restricted Cash Equivalents and Debt Securities, Gross Unrealized Losses

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Number of securities in unrealized gain position.

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258

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Fair value of financial obligations, including, but not limited to, debt instruments, derivative liabilities, federal funds purchased and sold under agreements to repurchase, securities loaned or sold under agreements to repurchase, financial instruments sold not yet purchased, guarantees, line of credit, loans and notes payable, servicing liability, and trading liabilities.

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- 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 https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258

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- Definition

Fair value portion of other liabilities.

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