Quarterly report pursuant to Section 13 or 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details)

v3.10.0.1
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
financial_institution
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
financial_institution
Sep. 30, 2017
USD ($)
Jan. 01, 2018
USD ($)
Dec. 31, 2017
USD ($)
Concentration Risks, Types, No Concentration Percentage            
Number of financial institutions where the Company holds checking deposits | financial_institution 1   1      
Restricted Cash [Abstract]            
Restricted cash, certificate of deposit $ 0 $ 100,000 $ 0 $ 100,000   $ 100,000
Restricted cash, pledged mutual fund 211,000   211,000     0
Investments            
Investment income   14,000   39,000    
Held-to-maturity Securities, Fair Value 8,900,000   8,900,000      
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss 0   0      
Investments held-to-maturity 8,884,000   8,884,000     0
Intangible Assets, Net            
Impairment of intangible assets 39,000   87,000      
Revenue Related to Research and Development [Abstract]            
Revenues 115,000 106,000 396,000 $ 482,000    
Deferred revenue 187,000   187,000   $ 146,000 143,000
Income Taxes            
Income tax penalties and interest accrued 0   $ 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)     6 years      
US Treasury Bills, Maturing April 2018            
Investments            
Investments held-to-maturity 25,000,000   $ 25,000,000      
Commercial Paper, Maturing June 2018            
Investments            
Investments held-to-maturity 14,700,000   14,700,000      
Commercial Paper, Maturing January 2019            
Investments            
Investments held-to-maturity 8,800,000   8,800,000      
Certificates of Deposit | Debt Securities, Maturing January 2019            
Investments            
Investments held-to-maturity 100,000   100,000      
Certificates of Deposit | Foreign Debt Securities            
Investments            
Investment income $ 177,000   $ 323,000