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Subsequent Events (Details)
$ / shares in Units, $ in Millions
9 Months Ended
May 09, 2019
shares
Feb. 05, 2019
USD ($)
$ / shares
Jan. 03, 2019
USD ($)
shares
Apr. 24, 2017
Sep. 30, 2019
Subsequent Event [Line Items]          
Reverse stock split ratio         0.0714
AmpliPhi Biosciences Corporation [Member]          
Subsequent Event [Line Items]          
Reverse stock split ratio       10  
Percentage of ownership 24.00%        
C3J [Member]          
Subsequent Event [Line Items]          
Number of shares issued per common stock outstanding 0.6906        
Reverse stock split ratio 0.0714        
Percentage of ownership 76.00%        
Scenario, Plan [Member] | AmpliPhi Biosciences Corporation [Member]          
Subsequent Event [Line Items]          
Expected price per share of combined entity | $ / shares   $ 0.36      
Subsequent Event [Member] | AmpliPhi Biosciences Corporation [Member]          
Subsequent Event [Line Items]          
Commitment to invest in the combined company | $     $ 10.0    
Common stock purchased upon closing of merger, value   $10.0      
Numerator for determination of per share price of Share Purchase Agreement | $   $ 40.0      
Subsequent Event [Member] | C3J [Member]          
Subsequent Event [Line Items]          
Number of shares issued per common stock outstanding 0.6906        
Reverse stock split ratio 0.0714        
Subsequent Event [Member] | C3J [Member] | Agreement and Plan of Merger and Reorganization [Member] | AmpliPhi Biosciences Corporation [Member]          
Subsequent Event [Line Items]          
Number of shares issued per common stock outstanding     0.6892    
Percentage of ownership     30.00%    
Subsequent Event [Member] | C3J [Member] | Agreement and Plan of Merger and Reorganization [Member] | C3J [Member]          
Subsequent Event [Line Items]          
Percentage of ownership     70.00%    
Subsequent Event [Member] | C3J [Member] | Agreement and Plan of Merger and Reorganization [Member] | Minimum [Member] | AmpliPhi Biosciences Corporation [Member]          
Subsequent Event [Line Items]          
Reverse stock split ratio     0.33    
Subsequent Event [Member] | C3J [Member] | Agreement and Plan of Merger and Reorganization [Member] | Maximum [Member] | AmpliPhi Biosciences Corporation [Member]          
Subsequent Event [Line Items]          
Reverse stock split ratio     0.05