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Shareholders' Equity - Summary of Stock Option Activity (Details) - Stock Options [Member] - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Options outstanding, beginning balance 156,000 165,000
Options Granted 2,000 8,000
Options Exercised
Options Cancelled (6,000) (8,000)
Options Forfeited (4,000) (9,000)
Options Expired (1,000)
Options Outstanding, ending balance 147,000 156,000
Options vested and exercisable 137,000  
Weighted Average Exercise Price Per Share Outstanding, beginning balance $ 17.74 $ 17.78
Weighted Average Exercise Price Per Share Granted 4.44 6.66
Weighted Average Exercise Price Per Share Exercised
Weighted Average Exercise Price Per Share Cancelled 10.42 16.76
Weighted Average Exercise Price Per Share Forfeited 6.38 9.87
Weighted Average Exercise Price Per Share Expired 16.00
Weighted Average Exercise Price Per Share Outstanding, ending balance 18.20 $ 17.74
Weighted Average Exercise Price Per Share vested and exercisable $ 18.81  
Weighted Average Remaining Contractual Life (in years) Outstanding, beginning balance 7 years 1 month 13 days 8 years 8 months 2 days
Weighted Average Remaining Contractual Life (in years) Outstanding, ending balance 6 years 29 days 7 years 1 month 13 days
Weighted Average Remaining Contractual Life (in years) vested and exercisable 5 years 11 months 26 days  
Aggregate Intrinsic Value Outstanding, beginning balance $ 36,000
Aggregate Intrinsic Value Outstanding, ending balance
Aggregate Intrinsic Value vested and exercisable