CASH, CASH EQUIVALENTS, AND RESTRICTED CASH (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2016
Restricted Cash and Cash Equivalents Items [Line Items]
Cash and cash equivalents	$ 38,436	$ 5,580
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	38,865	22,006	$ 17,823	$ 22,511
Continuing Operations [Member] | Prepaid Expenses and Other Current Assets
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	77	112
Continuing Operations [Member] | Other Noncurrent Assets
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	352	102
Discontinued Operations
Restricted Cash and Cash Equivalents Items [Line Items]
Cash and cash equivalents	0	15,460
Discontinued Operations | Other Current Assets [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	0	183
Discontinued Operations | Other Assets Noncurrent [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	$ 0	$ 569