PREPAID EXPENSE AND OTHER CURRENT ASSETS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Prepaid Expense and Other Current Assets
Other receivables	$ 3,712	$ 4,607
Prepaid expense	633	1,076
Deposits	7	1,395
Inventory, net	0	587
Other current assets	271	242
Total	4,623	$ 7,907
Impairment on security deposit	$ 1,300