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Stockholders' equity - Recent Stock Issuances (Details) - USD ($)
1 Months Ended 12 Months Ended
Oct. 31, 2018
Jan. 31, 2018
Jan. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Oct. 24, 2018
New Common Shares Issued (value)       $ 10,616,046 $ 24,989,257  
New Common Shares Issued (number of shares)       2,500,285    
Proceeds from Warrant Exercises       $ 5,300,000    
Common stock, par value (in dollars per share)       $ 0.001 $ 0.001  
Common Stock            
New Common Shares Issued (value)       $ 3,692 $ 2,421  
New Common Shares Issued (number of shares)       3,692,307 2,421,073  
January 2017 Equity Subscription [Member] | Common Stock | Intrexon [Member]            
New Common Shares Issued (value)     $ 25,000,000      
New Common Shares Issued (number of shares)     2,421,073      
Shares Issued, Price Per Share     $ 10.326      
January 2018 Public Offering [Member]            
Proceeds from Issuance or Sale of Equity   $ 10,600,000        
January 2018 Public Offering [Member] | Majority Shareholder            
Proceeds from Issuance or Sale of Equity   $ 5,000,000        
October 2018 Common Share Offering [Member]            
Proceeds from Issuance or Sale of Equity $ 4,300,000          
Common stock, par value (in dollars per share)           $ 2.00
Common Stock | January 2018 Public Offering [Member]            
New Common Shares Issued (number of shares)   3,692,307        
Common Stock | January 2018 Public Offering [Member] | Majority Shareholder            
New Common Shares Issued (number of shares)   1,538,461        
Common Stock | October 2018 Common Share Offering [Member]            
New Common Shares Issued (number of shares) 2,250,461          
Warrant [Member]            
New Common Shares Issued (number of shares)       4,246,153    
Warrant [Member] | January 2018 Public Offering [Member]            
New Common Shares Issued (number of shares)   4,246,153   4,246,153    
Warrant [Member] | January 2018 Public Offering [Member] | Majority Shareholder            
New Common Shares Issued (number of shares)   1,538,461        
Majority Shareholder | October 2018 Common Share Offering [Member]            
Proceeds from Issuance or Sale of Equity $ 3,100,000          
Majority Shareholder | Common Stock | October 2018 Common Share Offering [Member]            
New Common Shares Issued (number of shares) 1,538,461