Stockholders' Equity - Summary of Information About Warrants (Detail)	6 Months Ended
	Mar. 31, 2017 $ / shares shares
Class Of Warrant Or Right [Line Items]
Warrants outstanding	527,181
Warrant 1
Class Of Warrant Or Right [Line Items]
Exercise prices | $ / shares	$ 70.60
Warrants outstanding	94,897
Remaining Life in Years	1 month 6 days
Warrant 2
Class Of Warrant Or Right [Line Items]
Exercise prices | $ / shares	$ 2.12
Warrants outstanding	75,000
Remaining Life in Years	10 months 24 days
Warrant 3
Class Of Warrant Or Right [Line Items]
Exercise prices | $ / shares	$ 1.83
Warrants outstanding	277,284
Remaining Life in Years	8 months 12 days
Warrant 4
Class Of Warrant Or Right [Line Items]
Exercise prices | $ / shares	$ 7.14
Warrants outstanding	80,000
Remaining Life in Years	1 year 2 months 12 days