Stockholders' Equity - Summary of Information About Warrants (Detail) (USD $)	12 Months Ended
	Sep. 30, 2014
Class Of Warrant Or Right [Line Items]
Exercise prices	$ 1.83
Number of Warrants	1,490,589
Warrant 1
Class Of Warrant Or Right [Line Items]
Exercise prices	$ 70.60
Number of Warrants	94,897
Remaining Life in Years	2 years 7 months 6 days
Warrant 2
Class Of Warrant Or Right [Line Items]
Exercise prices	$ 5.00
Number of Warrants	413,825
Remaining Life in Years	10 months 24 days
Warrant 3
Class Of Warrant Or Right [Line Items]
Exercise prices	$ 5.09
Number of Warrants	269,912
Remaining Life in Years	2 months 12 days
Warrant 4
Class Of Warrant Or Right [Line Items]
Exercise prices	$ 1.38
Number of Warrants	24,324
Remaining Life in Years	1 year 2 months 12 days
Warrant 5
Class Of Warrant Or Right [Line Items]
Exercise prices	$ 4.16
Number of Warrants	1,000
Remaining Life in Years	2 years 2 months 12 days
Warrant 6
Class Of Warrant Or Right [Line Items]
Exercise prices	$ 3.25
Number of Warrants	334,347
Remaining Life in Years	1 year 10 months 24 days
Warrant 7
Class Of Warrant Or Right [Line Items]
Exercise prices	$ 2.12
Number of Warrants	75,000
Remaining Life in Years	3 years 2 months 12 days
Warrant 8
Class Of Warrant Or Right [Line Items]
Exercise prices	$ 1.83
Number of Warrants	277,284
Remaining Life in Years	3 years 2 months 12 days