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Related Party Transactions (Details)
3 Months Ended 9 Months Ended 12 Months Ended
Oct. 10, 2016
Oct. 10, 2012
item
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
CMCC              
Related Party Transactions              
Related party transaction amount     $ 0   $ 10,000   $ 10,000
Potential milestone payable     1,300,000   1,300,000    
Amounts due     0   $ 0   10,000
CMCC | Minimum              
Related Party Transactions              
Non-royalty income attributable to sublicense (as a percent)         10.00%    
CMCC | Maximum              
Related Party Transactions              
Non-royalty income attributable to sublicense (as a percent)         20.00%    
Co-founders              
Related Party Transactions              
Related party transaction amount     40,000 $ 40,000 $ 120,000 $ 120,000  
Amounts due     $ 0   $ 0   $ 0
Number of scientific co-founders | item   2          
Term of agreement 4 years 4 years