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Significant Accounting Policies (Estimated Annual Patent Amortization Expense) (Details) - AmpliPhi Biosciences Corporation [Member] - USD ($)
Dec. 31, 2018
Dec. 31, 2017
2019 $ 31,000  
2020 31,000  
2021 31,000  
2022 31,000  
2023 31,000  
Thereafter through December 2026 90,000  
Total patent amortization expense $ 245,000 $ 276,000