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Shareholders' Equity (Share Option Activity) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Shareholders' Equity [Abstract]      
Outstanding, beginning balance 1,173,433 1,653,434 1,151,121
Granted 154,600 527,500
Forfeited and cancelled (43,159) (152,698) (25,187)
Exercised (610,489) (481,903)
Outstanding, ending balance 519,785 1,173,433 1,653,434
Vested at year end 217,976 490,086 725,466
Vested and expected to vest at December 31, 2018 508,684    
Exercisable at December 31, 2018 217,976    
Weighted average exercise price, Outstanding, beginning balance $ 2.80 $ 2.82 $ 3.28
Weighted average exercise price, Granted 2.75 1.92
Weighted average exercise price, Forfeited and cancelled 2.53 2.77 5.00
Weighted average exercise price, Exercised 2.79 2.87 0.00
Weighted average exercise price, Outstanding, ending balance 3.16 2.80 2.82
Weighted exercise price, Vested at year end 2.85 $ 3.36 $ 3.32
Weighted average exercise price, Vested and expected to vest at December 31, 2018 3.16    
Weighted average exercise price, Exercisable at December 31, 2018 $ 2.85    
Weighted average Remaining Contractual term (years), Outstanding 4 years 1 month 20 days    
Weighted average Remaining Contractual term (years), Vested and expected to vest 4 years 1 month 20 days    
Weighted average Remaining Contractual term (years), Exercisable 3 years 1 month 20 days    
Aggregate intrinsic Value, Outstanding $ 1,886 $ 3,450 $ 1,040
Aggregate Intrinsic Value, Vested and Expected to Vest 1,846    
Aggregate intrinsic Value, Exercisable $ 855 $ 1,140 $ 204