ACCRUED EXPENSES (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
ACCRUED EXPENSES [Abstract]
Accrued compensation and benefits	$ 3,785	$ 4,337
Accrued rent and real estate taxes	1,763	3,057
Other accrued expenses	2,321	3,211
Accrued expenses	$ 7,869	$ 10,605