FAIR VALUES OF ASSETS AND LIABILITIES (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Assets and liabilities measured at fair value on a recurring basis
Marketable securities	$ 734	$ 11,577
Derivative warrant liability	(41)	(1,314)
Recurring basis
Assets and liabilities measured at fair value on a recurring basis
Cash equivalents	16,524	21,353
Marketable securities	734	11,577
Derivative warrant liability	(41)	(1,314)
Recurring basis | Level 1
Assets and liabilities measured at fair value on a recurring basis
Cash equivalents	16,524	21,353
Recurring basis | Level 2
Assets and liabilities measured at fair value on a recurring basis
Marketable securities	734	11,577
Derivative warrant liability	$ (41)	$ (1,314)