CASH, CASH EQUIVALENTS, AND RESTRICTED CASH (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Restricted Cash and Cash Equivalents Items [Line Items]
Cash and cash equivalents	$ 30,266	$ 40,562
Total cash, cash equivalents, and restricted cash	30,842	41,060	$ 43,297	$ 22,006
Continuing Operations | Prepaid Expenses and Other Current Assets
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	199	146
Continuing Operations | Other Noncurrent Assets
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	$ 377	$ 352