COST OF REVENUE (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Cost of Revenue [Abstract]
Compensation and benefits	$ 15,171	$ 23,947	$ 55,655	$ 74,776
Outside fees and services	16,891	34,013	52,473	123,914
Technology and telecommunications	6,391	8,776	18,972	27,082
Reimbursable expenses	1,416	2,810	5,365	14,495
Depreciation and amortization	798	3,024	2,397	9,512
Total	$ 40,667	$ 72,570	$ 134,862	$ 249,779

Cost, Reimbursable Expenses

No definition available.

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- Definition

Represents the fees paid to external providers for provision of services.

+ References

No definition available.

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- Definition

The amount of expense in the period for communications and data processing expense.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.4)
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- Definition

Cost of labor directly related to good produced and service rendered. Includes, but is not limited to, payroll cost and equity-based compensation.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(b)(2))
-URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227

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- Definition

The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 924
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 11.L)
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-Topic 220
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-Section S99
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-Subparagraph (SX 210.5-03.2(a),(d))
-URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227

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Amount of expense for allocation of cost of tangible and intangible assets over their useful lives directly used in production of good and rendering of service.

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