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Stockholders' Equity - Summary of Information About Warrants (Detail)
 3 Months Ended
Dec. 31, 2015
$ / shares
shares
Class Of Warrant Or Right [Line Items]  
Warrants outstanding 1,466,437
Warrant 1  
Class Of Warrant Or Right [Line Items]  
Exercise prices | $ / shares $ 70.60
Warrants outstanding 94,897
Remaining Life in Years 1 year 4 months 24 days
Warrant 2  
Class Of Warrant Or Right [Line Items]  
Exercise prices | $ / shares $ 5.00
Warrants outstanding 364,375
Remaining Life in Years 6 months
Warrant 3  
Class Of Warrant Or Right [Line Items]  
Exercise prices | $ / shares $ 5.09
Warrants outstanding 239,534
Remaining Life in Years 6 months
Warrant 4  
Class Of Warrant Or Right [Line Items]  
Exercise prices | $ / shares $ 4.16
Warrants outstanding 1,000
Remaining Life in Years 1 year
Warrant 5  
Class Of Warrant Or Right [Line Items]  
Exercise prices | $ / shares $ 3.25
Warrants outstanding 334,347
Remaining Life in Years 7 months 6 days
Warrant 6  
Class Of Warrant Or Right [Line Items]  
Exercise prices | $ / shares $ 2.12
Warrants outstanding 75,000
Remaining Life in Years 2 years
Warrant 7  
Class Of Warrant Or Right [Line Items]  
Exercise prices | $ / shares $ 1.83
Warrants outstanding 277,284
Remaining Life in Years 2 years
Warrant 8  
Class Of Warrant Or Right [Line Items]  
Exercise prices | $ / shares $ 7.14
Warrants outstanding 80,000
Remaining Life in Years 2 years 6 months