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Significant Accounting Policies (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Significant Accounting Policies (Textual)      
Net of allowances for doubtful accounts $ 9 $ 9  
Total inventory write-offs during period 369 498 $ 346
Impairment losses
Percentage of marketing expenses 50.00%    
Reduction of marketing expenses for government grants $ 6 75 $ 215
Warrants excluded from calculation of diluted net income (loss) per share 70,801   1,349,414
Unrecognized tax benefits    
Cumulative adjustment will increase in accumulated deficit $ 337    
Severance expenses 1,007 $ 905 $ 485
Decreasing the Company's deferred revenues $ 80    
Recognized income tax positions, description Measured at the largest amount that is greater than 50% of the amount likely to be realized.    
Increasing Company's trade receivables $ 233    
Increasing Company's other accounts receivable and prepaid expenses $ 24