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Shareholders' Equity - Schedule of Option Activity (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Equity [Abstract]      
Number of Shares Subject to Option, Beginning 1,291,866 1,407,006 1,570,799
Number of Shares Subject to Option, Granted 158,000 85,250 204,000
Number of Shares Subject to Option, Cancelled (470,956) (200,390) (367,793)
Number of Shares Subject to Option, Exercised
Number of Shares Subject to Option, Ending 978,910 1,291,866 1,407,006
Weighted Average Exercise Price, Beginning $ 6.96 $ 7.11 $ 7.49
Weighted Average Exercise Price, Granted 1.06 1.83 5.26
Weighted Average Exercise Price, Cancelled 10.57 5.89 7.70
Weighted Average Exercise Price, Exercised
Weighted Average Exercise Price, Ending $ 4.26 $ 6.96 $ 7.11
Weighted Average Remaining Contractual Term (Years), Beginning   6 years 2 months 12 days 5 years 2 months 12 days
Weighted Average Remaining Contractual Term (Years), Ending   7 years 1 month 6 days 6 years 2 months 12 days
Aggregate Intrinsic Value