CASH AND CASH EQUIVALENTS (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015
Cash and cash equivalents
Cash and cash equivalents	$ 14,440	$ 21,464	$ 40,871	$ 14,920
Cash
Cash and cash equivalents
Cash and cash equivalents	103	111
Money market funds
Cash and cash equivalents
Cash and cash equivalents	$ 14,337	$ 21,353