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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details)	3 Months Ended
	Mar. 31, 2018 USD ($) financial_institution	Mar. 31, 2017 USD ($)	Jan. 01, 2018 USD ($)	Dec. 31, 2017 USD ($)
Concentration Risks, Types, No Concentration Percentage [Abstract]
Number of financial institutions where the Company holds checking deposits \| financial_institution	1
Revenue Recognition [Abstract]
Revenue recognized	$ 157,000	$ 156,000
Deferred revenue, current	148,000		$ 140,000	$ 143,000
Income Taxes
Income tax penalties and interest accrued	0			$ 0
Income tax penalties and interest expense	$ 0	$ 0
Minimum
Property and Equipment
Useful life (in years)	3 years
Maximum
Property and Equipment
Useful life (in years)	5 years
Certificates of Deposit \| Foreign Debt Securities
Investments
Investment income	$ 48,000