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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Estimated Useful Lives of Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Capitalized software, leasehold improvements and equipment, net:
Property and equipment, net	$ 108,842	$ 103,361
Capitalized software and computer equipment | Minimum
Capitalized software, leasehold improvements and equipment, net:
Estimated useful life (in years)	2 years
Capitalized software and computer equipment | Maximum
Capitalized software, leasehold improvements and equipment, net:
Estimated useful life (in years)	3 years
Furniture and other equipment | Minimum
Capitalized software, leasehold improvements and equipment, net:
Estimated useful life (in years)	5 years
Furniture and other equipment | Maximum
Capitalized software, leasehold improvements and equipment, net:
Estimated useful life (in years)	7 years
Leasehold improvements | Minimum
Capitalized software, leasehold improvements and equipment, net:
Estimated useful life (in years)	5 years
Leasehold improvements | Maximum
Capitalized software, leasehold improvements and equipment, net:
Estimated useful life (in years)	25 years
Capitalized internal use software
Capitalized software, leasehold improvements and equipment, net:
Property and equipment, net	$ 67,900	$ 56,300

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- Definition

Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(14))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(8))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

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-Name Accounting Standards Codification
-Topic 210
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(13))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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