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Stockholders' Equity - Summary of Information about Warrants (Detail)	Sep. 30, 2012
Class of Warrant or Right [Line Items]
Number of Warrants	4,116,147
Warrant 1 [Member]
Class of Warrant or Right [Line Items]
Exercise prices	70.60
Number of Warrants	94,897
Remaining Life in Years	4 years 7 months 6 days
Warrant 2 [Member]
Class of Warrant or Right [Line Items]
Exercise prices	20.00
Number of Warrants	386,400
Remaining Life in Years	10 months 24 days
Warrant 3 [Member]
Class of Warrant or Right [Line Items]
Exercise prices	5.00
Number of Warrants	1,155,023
Remaining Life in Years	2 years 2 months 12 days
Warrant 4 [Member]
Class of Warrant or Right [Line Items]
Exercise prices	5.09
Number of Warrants	461,024
Remaining Life in Years	2 years 2 months 12 days
Warrant 5 [Member]
Class of Warrant or Right [Line Items]
Exercise prices	1.38
Number of Warrants	322,150
Remaining Life in Years	3 years 2 months 12 days
Warrant 6 [Member]
Class of Warrant or Right [Line Items]
Exercise prices	4.16
Number of Warrants	1,000
Remaining Life in Years	4 years 2 months 12 days
Warrant 7 [Member]
Class of Warrant or Right [Line Items]
Exercise prices	3.25
Number of Warrants	1,695,654
Remaining Life in Years	3 years 10 months 24 days