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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
financial_institution
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
financial_institution
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Concentration Risks, Types, No Concentration Percentage [Abstract]          
Number of financial institutions where the Company holds checking deposits | financial_institution 1   1    
Revenue Recognition [Abstract]          
Revenue recognized $ 106,000   $ 482,000    
Deferred revenue, current 261,000   261,000   $ 279,000
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)     5 years    
Certificates of Deposit | Foreign Debt Securities          
Investments          
Investment income $ 14,000 $ 4,000 $ 39,000 $ 10,000