REVENUE RECOGNITION - Schedule of Effect of New Accounting Pronouncements (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Jan. 01, 2018	Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Prepaid expenses and other current assets	$ 523,000		$ 603,000	$ 536,000
Deferred revenue, current	148,000		140,000	143,000
Accumulated deficit	(73,464,000)		$ (67,748,000)	(67,812,000)
Revenue	157,000	$ 156,000
Net loss	(5,716,000)	$ (4,894,000)
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Prepaid expenses and other current assets	496,000			536,000
Deferred revenue, current	137,000			143,000
Accumulated deficit	(73,480,000)			(67,812,000)
Revenue	205,000
Net loss	(5,668,000)
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Prepaid expenses and other current assets	27,000			67,000
Deferred revenue, current	11,000			(3,000)
Accumulated deficit	16,000			$ 64,000
Revenue	(48,000)
Net loss	$ 48,000