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Fair Value Measurements - Additional Information (Detail) - USD ($)
 3 Months Ended 6 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Sep. 30, 2017
Jan. 31, 2013
Dec. 31, 2012
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]                
Warrants outstanding 80,000   80,000          
Contingent consideration obligations $ 0   $ 0     $ 0    
2012 Warrants                
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]                
Warrants issued to acquire Common Stock               912,543
Warrants cancelled upon expiration         143,811      
2013 Warrants                
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]                
Warrants issued to acquire Common Stock             833,530  
Warrants outstanding 0   0          
Warrant                
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]                
Non-cash gain (loss) from change in fair value of the derivative liability $ (18,598) $ (25,883) $ 432,141 $ 1,428,948