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Shareholders' Equity (Details) - Stock options [Member] - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Number of options    
Options outstanding, beginning balance 624,437  
Granted 179,002  
Exercised (109,487)  
Expired and forfeited (14,400)  
Options outstanding, ending balance 679,552 624,437
Vested and expected to vest 679,552  
Exercisable at December 31, 2017 254,850 330,337
Weighted average exercise price    
Options outstanding, beginning balance $ 10.47 $ 7.75
Granted 19.48  
Exercised 8.13  
Expired and forfeited 11.29  
Options outstanding, ending balance 13.20 10.47
Vested and expected to vest 13.20  
Exercisable at December 31, 2017 $ 10.31 $ 9.41
Weighted average remaining contractual term (in years)    
Outstanding, beginning balance 3 years 6 months 18 days  
Outstanding, ending balance 3 years 4 months 6 days  
Vested and expected to vest 3 years 4 months 6 days  
Exercisable at December 31, 2017 2 years 4 months 6 days  
Aggregate intrinsic value    
Outstanding, beginning balance $ 4,576 $ 6,157
Outstanding, ending balance 4,517 $ 4,576
Vested and expected to vest 4,517  
Exercisable as of December 31, 2017 $ 2,431