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Stockholders' Equity - Summary of Information About Warrants (Detail)	Mar. 31, 2013
Class of Warrant or Right [Line Items]
Exercise prices	2.14
Number of Warrants	6,055,535
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 1 month 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	4 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	1 year 8 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	1 year 8 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	2 years 8 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	3 years 8 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 4 months 24 days
Warrant 8 [Member]
Class of Warrant or Right [Line Items]
Exercise prices	2.12
Number of Warrants	987,543
Remaining Life in Years	4 years 8 months 12 days
Warrant 9 [Member]
Class of Warrant or Right [Line Items]
Exercise prices	2.83
Number of Warrants	79,013
Remaining Life in Years	3 years 4 months 24 days
Warrant 10 [Member]
Class of Warrant or Right [Line Items]
Exercise prices	2.14
Number of Warrants	833,530
Remaining Life in Years	4 years 9 months 18 days
Warrant 11 [Member]
Class of Warrant or Right [Line Items]
Exercise prices	2.65
Number of Warrants	39,301
Remaining Life in Years	3 years 4 months 24 days