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Related Party Transactions (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2018
Sep. 30, 2019
Oct. 31, 2018
Oct. 15, 2018
Sep. 05, 2018
Related Party Transaction [Line Items]          
Common Stock, Shares, Issued 15,484,411 16,808,758      
Common Stock, Value, Issued $ 15 $ 17      
Common Stock, Par or Stated Value Per Share $ (0.001) $ (0.001)      
Class of Warrant or Right, Number of Securities Called by Warrants or Rights       13,672,173  
Class of Warrant or Right, Exercise Price of Warrants or Rights     $ 1.38 $ 1.38  
Proceeds from Issuance of Common Stock $ 12,200        
Synthetic Biomics Inc [Member]          
Related Party Transaction [Line Items]          
Additional Number Of Common Stock To Be Issued         2,420,000
Cedarssinai Medical Center [Member]          
Related Party Transaction [Line Items]          
Number Of Common Stock To Be Issued   50,000     50,000
Cedarssinai Medical Center [Member] | Synthetic Biomics Inc [Member]          
Related Party Transaction [Line Items]          
Number Of Common Stock To Be Held By Related Party   7,480,000     7,480,000
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners   17.00%     17.00%