CASH AND RESTRICTED CASH (Details - Balance Sheet) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Cash and Cash Equivalents [Abstract]
Cash and cash equivalents	$ 51,208	$ 60,243
Restricted cash and cash equivalents	93	96
Cash, cash equivalents, restricted cash and restricted cash equivalents at beginning of period	$ 51,301	$ 60,339	$ 64,603	$ 105,158