FAIR VALUE MEASUREMENTS - Marketable Securities Unrealized Gain Position (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Fair value of marketable equity securities
Carrying Amount	$ 10,582	$ 0
Less than 12 Months	10,582	0
12 Months or Greater	0	0
Total	10,582	0
Unrealized gains
Unrealized gains	0	0
Less than 12 Months	3,043	0
12 Months or Greater	0	0
Total	$ 3,043	$ 0