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Shareholders' Equity - Summary of Stock Option Activity (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Options Granted  
Stock Option Grants [Member]    
Options Outstanding, beginning balance 142,000 147,000
Options Granted 3,000
Options Cancelled (115,000) (6,000)
Options Forfeited (1,000) (2,000)
Options Outstanding, ending balance 26,000 142,000
Options vested and exercisable 26,000  
Weighted Average Exercise Price Per Share Outstanding, beginning balance $ 18.26 $ 18.20
Weighted Average Exercise Price Per Share Granted 3.15
Weighted Average Exercise Price Per Share Cancelled 17.55 13.32
Weighted Average Exercise Price Per Share Forfeited 8.09 6.24
Weighted Average Exercise Price Per Share Outstanding, ending balance 21.76 $ 18.26
Weighted Average Exercise Price Per Share vested and exercisable $ 21.76  
Weighted Average Remaining Contractual Life (in years) Outstanding, beginning balance 5 years 1 month 20 days 6 years 29 days
Weighted Average Remaining Contractual Life (in years) Outstanding, ending balance 4 years 6 months 21 days 5 years 1 month 20 days
Weighted Average Remaining Contractual Life (in years) vested and exercisable 4 years 6 months 21 days  
Aggregate Intrinsic Value Outstanding, beginning balance
Aggregate Intrinsic Value Outstanding, ending balance
Aggregate Intrinsic Value vested and exercisable