INCOME TAX - Schedule of Components of Income Tax (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Components of the company's income tax provision
Total income tax expense, including excise tax	$ 352	$ 515	$ 446
Excise tax rate	4.00%
ACRE Capital Sale
Components of the company's income tax provision
Current	$ 82	114	84
Deferred	(99)	99	0
Excise tax	369	302	362
Total income tax expense, including excise tax	$ 352	$ 515	$ 446