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Shareholders' Equity (Details 2) - Employee RSUs [Member]
9 Months Ended
Sep. 30, 2019
$ / shares
shares
Number of shares underlying outstanding RSUs  
Unvested RSUs at the Beginning of the period | shares 26,093
Granted | shares 87,436
Vested | shares (27,618)
Forfeited | shares (10,875)
Unvested RSUs at the end of the period | shares 75,036
Weighted average grant date fair value  
Unvested RSUs at the Beginning of the period | $ / shares $ 48.78
Granted | $ / shares 4.69
Vested | $ / shares 7.27
Forfeited | $ / shares 18.42
Unvested RSUs at the end of the period | $ / shares $ 42.60