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Shareholders' Equity (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 6 Months Ended
Feb. 19, 2015
Jun. 30, 2018
Jun. 30, 2017
Oct. 30, 2016
Stock options [Member]        
Shareholder's Equity (Textual)        
Weighted average fair values of options granted   $ 7.96  
RSUs [Member]        
Shareholder's Equity (Textual)        
Weighted average fair values of options granted   $ 19.62 $ 18.44  
Compensation cost   $ 827 $ 778  
Unrecognized costs related to non-vested share-based compensation   $ 3,374    
Recognized over a weighted average period   1 year 1 month 13 days    
2013 Share Option Plan [Member]        
Shareholder's Equity (Textual)        
Option plan expire date Apr. 02, 2023      
Shares available for future grants   883,470    
2013 Share Option Plan [Member] | Maximum [Member]        
Shareholder's Equity (Textual)        
Increase number of shares reserved under share option plan       2,450,000
2013 Share Option Plan [Member] | Minimum [Member]        
Shareholder's Equity (Textual)        
Increase number of shares reserved under share option plan       1,250,000