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Stockholders' Equity - Summary of Information About Warrants (Detail)
Jun. 30, 2013
Jan. 31, 2013
Class Of Warrant Or Right [Line Items]    
Exercise prices 1.83 1.83
Number of Warrants 6,055,535  
Warrant 1
    
Class Of Warrant Or Right [Line Items]    
Exercise prices 70.60  
Number of Warrants 94,897  
Remaining Life in Years 3 years 10 months 24 days  
Warrant 2
    
Class Of Warrant Or Right [Line Items]    
Exercise prices 20.00  
Number of Warrants 386,400  
Remaining Life in Years 1 month 6 days  
Warrant 3
    
Class Of Warrant Or Right [Line Items]    
Exercise prices 5.00  
Number of Warrants 1,155,023  
Remaining Life in Years 1 year 4 months 24 days  
Warrant 4
    
Class Of Warrant Or Right [Line Items]    
Exercise prices 5.09  
Number of Warrants 461,024  
Remaining Life in Years 1 year 4 months 24 days  
Warrant 5
    
Class Of Warrant Or Right [Line Items]    
Exercise prices 1.38  
Number of Warrants 322,150  
Remaining Life in Years 2 years 6 months  
Warrant 6
    
Class Of Warrant Or Right [Line Items]    
Exercise prices 4.16  
Number of Warrants 1,000  
Remaining Life in Years 3 years 6 months  
Warrant 7
    
Class Of Warrant Or Right [Line Items]    
Exercise prices 3.25  
Number of Warrants 1,695,654  
Remaining Life in Years 3 years 1 month 6 days  
Warrant 8
    
Class Of Warrant Or Right [Line Items]    
Exercise prices 1.83  
Number of Warrants 987,543  
Remaining Life in Years 4 years 6 months  
Warrant 9
    
Class Of Warrant Or Right [Line Items]    
Exercise prices 2.83  
Number of Warrants 79,013  
Remaining Life in Years 3 years 1 month 6 days  
Warrant 10
    
Class Of Warrant Or Right [Line Items]    
Exercise prices 1.83  
Number of Warrants 833,530  
Remaining Life in Years 4 years 7 months 6 days  
Warrant 11
    
Class Of Warrant Or Right [Line Items]    
Exercise prices 2.65  
Number of Warrants 39,301  
Remaining Life in Years 3 years 1 month 6 days