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OTHER ASSETS - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Jun. 21, 2016
Interest and Other Income
Other Investment Not Readily Marketable [Line Items]
Realized gain on investment	$ 27,700,000
Minimum
Other Investment Not Readily Marketable [Line Items]
Potential stock received upon conversion of investment (shares)		0
Prepaid expenses and other current assets
Other Investment Not Readily Marketable [Line Items]
Assigned value of preferred shares	$ 0	$ 0

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.3(a))
-URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263

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