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Selected Statement of Operations Data (Details 3) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Research and development expenses:      
Research and development expenses $ 3,417 $ 3,517 $ 2,943
Research and development expense [Member]      
Research and development expenses:      
Payroll and related expenses 2,788 2,682 2,148
Rent and related expenses 280 330 321
Depreciation and amortization 37 53 72
Subcontracting 165 307 202
Other $ 147 $ 145 $ 200