FAIR VALUES OF ASSETS AND LIABILITIES (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Assets and liabilities measured at fair value on a recurring basis
Derivative warrant liability	$ 2,695	$ 1,907
Recurring basis
Assets and liabilities measured at fair value on a recurring basis
Cash equivalents	37,672	20,078
Derivative warrant liability	2,695	1,907
Recurring basis | Level 1
Assets and liabilities measured at fair value on a recurring basis
Cash equivalents	37,672	20,078
Recurring basis | Level 2
Assets and liabilities measured at fair value on a recurring basis
Derivative warrant liability	$ 2,695	$ 1,907