FAIR VALUES OF ASSETS AND LIABILITIES (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Assets and liabilities measured at fair value on a recurring basis
Marketable securities	$ 12,400	$ 11,577
Derivative warrant liability	1,073	1,314
Recurring basis
Assets and liabilities measured at fair value on a recurring basis
Cash equivalents	14,337	21,353
Marketable securities	12,400	11,577
Derivative warrant liability	1,073	1,314
Recurring basis | Level 1
Assets and liabilities measured at fair value on a recurring basis
Cash equivalents	14,337	21,353
Recurring basis | Level 2
Assets and liabilities measured at fair value on a recurring basis
Marketable securities	12,400	11,577
Derivative warrant liability	$ 1,073	$ 1,314