FAIR VALUE MEASUREMENT - Measured at fair value on a non recurring basis (Details) - USD ($)	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Fair Value Disclosures [Abstract]
Impairment loss as an offset to other income	$ 600,000		$ 755,524
Impairment loss on other intangible assets arising from acquisitions	0	$ 0
Impairment loss on goodwill	$ 0	$ 0	$ 0

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration