Stockholders' Equity - Summary of Information About Warrants (Detail)	12 Months Ended
	Sep. 30, 2013
Class Of Warrant Or Right [Line Items]
Exercise prices	1.83
Number of Warrants	4,402,523
Warrant 1
Class Of Warrant Or Right [Line Items]
Exercise prices	70.60
Number of Warrants	94,897
Remaining Life in Years	3 years 7 months 6 days
Warrant 2
Class Of Warrant Or Right [Line Items]
Exercise prices	5.00
Number of Warrants	1,155,023
Remaining Life in Years	1 year 2 months 12 days
Warrant 3
Class Of Warrant Or Right [Line Items]
Exercise prices	5.09
Number of Warrants	461,024
Remaining Life in Years	1 year 2 months 12 days
Warrant 4
Class Of Warrant Or Right [Line Items]
Exercise prices	1.38
Number of Warrants	187,313
Remaining Life in Years	2 years 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	3 years 2 months 12 days
Warrant 6
Class Of Warrant Or Right [Line Items]
Exercise prices	3.25
Number of Warrants	1,685,870
Remaining Life in Years	2 years 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	4 years 2 months 12 days
Warrant 8
Class Of Warrant Or Right [Line Items]
Exercise prices	1.83
Number of Warrants	742,396
Remaining Life in Years	4 years 2 months 12 days