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Summary of Significant Accounting Policies - Property and Equipment (Details) - USD ($)
3 Months Ended 12 Months Ended 39 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Sep. 30, 2017
Property, Plant and Equipment      
Fixed asset impairment $ 0 $ 10,000 $ 0
Office equipment      
Property, Plant and Equipment      
Property, plant and equipment useful life 3 years    
Lab equipment      
Property, Plant and Equipment      
Property, plant and equipment useful life 5 years    
Furniture and fixtures      
Property, Plant and Equipment      
Property, plant and equipment useful life 5 years