FAIR VALUE OF FINANCIAL INSTRUMENTS - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended							12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Indefinite-lived Intangible Assets [Line Items]
Impairment charge related to ROU asset impairment		$ 100	$ 200	$ 300		$ 1,100	$ 6,000	$ 556	$ 1,064	$ 5,956
Impairment, long-lived asset	$ 900				$ 1,400		$ 2,200	1,658	1,439	$ 2,148
Proceeds from sale of investment			1,200
Gain on disposal of investment			900					$ (300)	$ 0
Abandoned Furniture And Fixtures
Indefinite-lived Intangible Assets [Line Items]
Impairment, long-lived asset				100
Abandoned Computers And Equipment
Indefinite-lived Intangible Assets [Line Items]
Impairment, long-lived asset			$ 500	$ 200