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Selected Statement of Operations Data (Details 4) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Selling and marketing expenses:      
Selling and marketing expenses $ 1,250 $ 1,105 $ 1,173
Selling and marketing expense [Member]      
Selling and marketing expenses:      
Payroll and related expenses 953 911 949
Depreciation and amortization 5 5 4
Travel and conventions 58 71 123
Other $ 234 $ 118 $ 97