NATURE OF OPERATIONS AND GOING CONCERN, BASIS OF PRESENTATION AND RECENT ACCOUNTING PRONOUNCEMENTS, RECONCILIATION OF CASH, CASH EQUIVALENTS AND RESTRICTED CASH (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
NATURE OF OPERATIONS AND GOING CONCERN, BASIS OF PRESENTATION AND RECENT ACCOUNTING PRONOUNCEMENTS
Cash and cash equivalents	$ 22,320	$ 12,910	$ 14,322
Restricted cash included in current assets	12	361	361
Restricted cash included in other non-current assets	90
Total cash, cash equivalents and restricted cash shown in the statement of cash flows	$ 22,422	$ 13,271	$ 14,683	$ 21,825