INCOME TAXES - Income tax provision (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Current:
Federal	$ 0	$ 0
State	0	0
Total current tax	0	0
Deferred:
Federal	(1,016)	(587)
State	(743)	(651)
Increase (decrease) in valuation allowance	1,839	1,714
Total deferred tax	80	476
Income Tax Expense (Benefit), Total	$ 80	$ 476