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Selected Statement of Operations Data (Details 4) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Selling and marketing expenses:      
Selling and marketing expenses $ 1,105 $ 1,173 $ 1,140
Selling and marketing expense [Member]      
Selling and marketing expenses:      
Payroll and related expenses 911 949 963
Depreciation and amortization 5 4 3
Travel and conventions 71 123 79
Other $ 118 $ 97 $ 95