Stockholders' Equity - Summary of Information About Warrants (Detail)	3 Months Ended
	Dec. 31, 2016 $ / 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	4 months 24 days
Warrant 2
Class Of Warrant Or Right [Line Items]
Exercise prices | $ / shares	$ 2.12
Warrants outstanding	75,000
Remaining Life in Years	1 year 2 months 12 days
Warrant 3
Class Of Warrant Or Right [Line Items]
Exercise prices | $ / shares	$ 1.83
Warrants outstanding	277,284
Remaining Life in Years	1 year
Warrant 4
Class Of Warrant Or Right [Line Items]
Exercise prices | $ / shares	$ 7.14
Warrants outstanding	80,000
Remaining Life in Years	1 year 6 months