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Selected Statement of Operations Data (Details 2) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Research and development expenses:      
Research and development expenses $ 3,747 $ 3,417 $ 3,517
Research and development expense [Member]      
Research and development expenses:      
Payroll and related expenses 3,136 2,788 2,682
Rent and related expenses 335 280 330
Depreciation and amortization 34 37 53
Subcontracting 87 165 307
Other $ 155 $ 147 $ 145