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Selected Statement of Operations Data (Details 3) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Research and development expenses:      
Research and development expenses $ 3,517 $ 2,943 $ 4,539
Research and development expense [Member]      
Research and development expenses:      
Payroll and related expenses 2,682 2,148 3,614
Rent and related expenses 330 321 367
Depreciation and amortization 53 72 114
Subcontracting 307 202 189
Other $ 145 $ 200 $ 255