FAIR VALUE MEASUREMENTS - Unrealized Gain Position (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Fair Value Disclosures [Abstract]
Fair value of marketable equity securities, Carrying Amount	$ 9,610	$ 10,582
Fair value of marketable securities, Less then 12 Months	9,610	10,582
Fair value of marketable securities, 12 Months or Greater	0	0
Fair value of marketable securities, Total	9,610	10,582
Unrealized gains, Carrying Amount	0	0
Unrealized gains, Less than 12 Months	(972)	3,043
Unrealized gains, 12 Months or Greater	0	0
Unrealized gains, Total	$ (972)	$ 3,043