REVENUE RECOGNITION (Schedule of Effect of New Accounting Pronouncements) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2018
ASSETS
Prepaid expenses and other current assets	$ 364,000	$ 536,000	$ 603,000
LIABILITIES AND STOCKHOLDERS' EQUITY
Deferred revenue, current	271,000		146,000
Accumulated deficit	(92,564,000)	(67,812,000)	$ (67,748,000)
STATEMENT OF COMPREHENSIVE LOSS
Revenues	524,000	653,000
Net loss	(24,816,000)	(21,653,000)
Calculated under Revenue Guidance in Effect before Topic 606
ASSETS
Prepaid expenses and other current assets	364,000	536,000
LIABILITIES AND STOCKHOLDERS' EQUITY
Deferred revenue, current	264,000	143,000
Accumulated deficit	(92,557,000)	(67,812,000)
STATEMENT OF COMPREHENSIVE LOSS
Revenues	595,000
Net loss	(24,745,000)
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606
ASSETS
Prepaid expenses and other current assets	0	67,000
LIABILITIES AND STOCKHOLDERS' EQUITY
Deferred revenue, current	7,000	3,000
Accumulated deficit	(7,000)	$ 64,000
STATEMENT OF COMPREHENSIVE LOSS
Revenues	(71,000)
Net loss	$ 71,000