FINANCIAL INSTRUMENTS - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Fair Value Disclosures [Abstract]
Carrying value of investments in equity securities without readily determinable fair value	$ 14,200,000		$ 14,200,000
Gross unrealized losses of downward adjustments to the carrying value of equity securities without readily determinable fair values	2,100,000
Impairment charge on equity securities without readily determinable fair value	$ 0	$ 0