FAIR VALUES OF ASSETS AND LIABILITIES (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Assets and liabilities measured at fair value on a recurring basis
Derivative warrant liability	$ 2	$ 4
Recurring basis
Assets and liabilities measured at fair value on a recurring basis
Cash equivalents	11,580	12,887
Derivative warrant liability	2	4
Recurring basis | Level 1
Assets and liabilities measured at fair value on a recurring basis
Cash equivalents	11,580	12,887
Recurring basis | Level 2
Assets and liabilities measured at fair value on a recurring basis
Derivative warrant liability	$ 2	$ 4