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Shareholders' Equity (Details 2) - Restricted Stock Units (RSUs) [Member]
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
shares
Number of RSUs  
Options outstanding, beginning balance 240,054
Granted 32,700
Vested (74,210)
Cancelled (29,675)
Options outstanding, ending balance 168,869
Vested and expected to vest at December 31, 2018 168,869
Weighted average remaining contractual term (in years)  
Options outstanding, beginning balance, Weighted average remaining contractual term (in years) 1 year 8 months 26 days
Options outstanding, ending balance, Weighted average remaining contractual term (in years) 1 year 4 months 24 days
Vested and expected to vest at December 31, 2018 1 year 4 months 24 days
Aggregate intrinsic value  
Outstanding, beginning balance | $ $ 4,765
Outstanding, ending balance | $ 1,253
Vested and expected to vest at December 31, 2018 | $ $ 1,253