OTHER (EXPENSE) INCOME, NET - Components of Other (Expense) Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Other Income and Expenses [Abstract]
Interest and investment income	$ 32	$ 137	$ 415	$ 299
Income tax expense	(12)	(268)	(127)	(709)
Other non-operating expense	(551)	0	(549)	0
Total other (expense) income, net	$ (531)	$ (131)	$ (261)	$ (410)