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Stockholders' Equity - Summary of Information About Warrants (Detail)	Dec. 31, 2012
Class of Warrant or Right [Line Items]
Exercise prices	2.12
Number of Warrants	5,138,195
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 4 months 24 days
Warrant 2 [Member]
Class of Warrant or Right [Line Items]
Exercise prices	20.00
Number of Warrants	386,400
Remaining Life in Years	7 months 6 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 10 months 24 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 10 months 24 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
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
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 7 months 6 days
Warrant 8 [Member]
Class of Warrant or Right [Line Items]
Exercise prices	2.20
Number of Warrants	912,543
Remaining Life in Years	5 years
Warrant 9 [Member]
Class of Warrant or Right [Line Items]
Exercise prices	2.83
Number of Warrants	109,505
Remaining Life in Years	3 years 7 months 6 days