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Stockholders' Equity - Summary of Information About Warrants (Detail)
 12 Months Ended
Sep. 30, 2017
$ / shares
shares
Class Of Warrant Or Right [Line Items]  
Warrants outstanding 432,284
Warrant 1  
Class Of Warrant Or Right [Line Items]  
Exercise prices | $ / shares $ 2.12
Warrants outstanding 75,000
Remaining Life in Years 4 months 24 days
Warrant 2  
Class Of Warrant Or Right [Line Items]  
Exercise prices | $ / shares $ 1.83
Warrants outstanding 277,284
Remaining Life in Years 2 months 12 days
Warrant 3  
Class Of Warrant Or Right [Line Items]  
Exercise prices | $ / shares $ 7.14
Warrants outstanding 80,000
Remaining Life in Years 8 months 12 days