INCOME TAX - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Operating Loss Carryforwards [Line Items]
Unrecognized tax benefits	$ 0	$ 0
U.S. Federal
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	160,600,000
U.S. State
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	31,900,000
Hong Kong
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 1,700,000
Federal income tax rate	16.50%
China
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 6,800,000
Federal income tax rate	25.00%
Carryover period	5 years