FAIR VALUES OF ASSETS AND LIABILITIES (Details) - USD ($)	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015
Assets and liabilities measured at fair value on a recurring basis
Marketable securities	$ 7,525,000		$ 11,577,000
Derivative warrant liability	(519,000)	$ (1,073,000)	(1,314,000)	$ (2,359,000)	$ (2,954,000)	$ (1,907,000)
Recurring basis
Assets and liabilities measured at fair value on a recurring basis
Cash equivalents	14,409,000		21,353,000
Marketable securities	7,525,000		11,577,000
Derivative warrant liability	(519,000)		(1,314,000)
Recurring basis | Level 1
Assets and liabilities measured at fair value on a recurring basis
Cash equivalents	14,409,000		21,353,000
Recurring basis | Level 2
Assets and liabilities measured at fair value on a recurring basis
Marketable securities	7,525,000		11,577,000
Derivative warrant liability	$ (519,000)		$ (1,314,000)