EMPLOYEE BENEFIT PLAN (Details) - USD ($)	6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017	Dec. 31, 2016
EMPLOYEE BENEFIT PLAN [Abstract]
Company contribution, cost recognized	$ 44,000	$ 30,000	$ 64,000	$ 102,000