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Shareholders' Equity (Details 1) - Employee RSUs [Member]
12 Months Ended
Dec. 31, 2019
$ / shares
shares
Number of shares underlying outstanding RSUs  
Unvested RSUs at the Beginning of the period | shares 26,093
Granted | shares 88,436
Vested | shares (40,793)
Forfeited | shares (11,358)
Unvested RSUs at the end of the period | shares 62,378
Weighted average grant date fair value  
Unvested RSUs at the Beginning of the period | $ / shares $ 48.78
Granted | $ / shares 4.67
Vested | $ / shares 5.78
Forfeited | $ / shares 17.19
Unvested RSUs at the end of the period | $ / shares $ 44.61