INCOME TAXES - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deferred tax liabilities:
Property and equipment	$ (564)	$ (3,112)
Total deferred tax liabilities	(564)	(3,112)
Deferred tax assets:
Net operating loss carryforwards	99	117
Accruals and allowances	43	248
Tax credits	5	4
Other – net	50	229
Capital loss carryover	627	921
Total deferred tax assets	824	1,519
Valuation allowance	(678)	(921)
Deferred tax assets net of valuation allowance	146	598
Net deferred tax liabilities	$ (418)	$ (2,514)