Stockholders' Equity - Summary of Information About Warrants (Detail)	6 Months Ended
	Mar. 31, 2016 $ / 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 1 month 6 days
Warrant 2
Class Of Warrant Or Right [Line Items]
Exercise prices | $ / shares	$ 5.00
Warrants outstanding	364,375
Remaining Life in Years	2 months 12 days
Warrant 3
Class Of Warrant Or Right [Line Items]
Exercise prices | $ / shares	$ 5.09
Warrants outstanding	239,534
Remaining Life in Years	2 months 12 days
Warrant 4
Class Of Warrant Or Right [Line Items]
Exercise prices | $ / shares	$ 4.16
Warrants outstanding	1,000
Remaining Life in Years	8 months 12 days
Warrant 5
Class Of Warrant Or Right [Line Items]
Exercise prices | $ / shares	$ 3.25
Warrants outstanding	334,347
Remaining Life in Years	4 months 24 days
Warrant 6
Class Of Warrant Or Right [Line Items]
Exercise prices | $ / shares	$ 2.12
Warrants outstanding	75,000
Remaining Life in Years	1 year 8 months 12 days
Warrant 7
Class Of Warrant Or Right [Line Items]
Exercise prices | $ / shares	$ 1.83
Warrants outstanding	277,284
Remaining Life in Years	1 year 8 months 12 days
Warrant 8
Class Of Warrant Or Right [Line Items]
Exercise prices | $ / shares	$ 7.14
Warrants outstanding	80,000
Remaining Life in Years	2 years 2 months 12 days