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Fair Value Measurements - Schedule of Liabilities Measured at Fair Value (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Mar. 31, 2013
Sep. 30, 2012
Mar. 31, 2012
Derivative Liability
        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Beginning Balance $ 181 $ 529 $ 2,763   
Valuation of derivative liability      3,779  
Warrant issuance with Senior Convertible Notes         
Warrant issuance with Senior Secured Term Loan         
Valuation of derivative liability attributable to modification    542    
Mark to market adjustment (348) (2,776) (1,016)  
Ending Balance 181 529 2,763   
Warrants
        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Beginning Balance 2,626 3,633 7,517   
Valuation of derivative liability         
Warrant issuance with Senior Convertible Notes      7,018  
Warrant issuance with Senior Secured Term Loan      380  
Valuation of derivative liability attributable to modification         
Mark to market adjustment (1,007) (3,884) 119  
Ending Balance $ 2,626 $ 3,633 $ 7,517