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Stockholders' Equity - Summary of Information About Warrants (Detail)
 3 Months Ended
Dec. 31, 2017
$ / shares
shares
Class Of Warrant Or Right [Line Items]  
Warrants outstanding 166,023
Warrant 1  
Class Of Warrant Or Right [Line Items]  
Exercise prices | $ / shares $ 2.12
Warrants outstanding 75,000
Remaining Life in Years 2 months 12 days
Warrant 2  
Class Of Warrant Or Right [Line Items]  
Exercise prices | $ / shares $ 1.83
Warrants outstanding 11,023
Remaining Life in Years 1 month 6 days
Warrant 3  
Class Of Warrant Or Right [Line Items]  
Exercise prices | $ / shares $ 7.14
Warrants outstanding 80,000
Remaining Life in Years 6 months