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Fair Value Measurements - Schedule of Liabilities Measured at Fair Value (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Mar. 31, 2013
Mar. 31, 2012
Derivative Liability [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Beginning Balance $ 477 $ 529   
Valuation of derivative liability   3,779  
Valuation of derivative liability attributable to modification   542  
Mark to market adjustment (52) (3,792)  
Ending Balance 477 529   
Warrants [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Beginning Balance 3,216 3,633   
Warrant issuance with Senior Convertible Notes   7,018  
Warrant issuance with Senior Secured Term Loan   380  
Mark to market adjustment (417) (3,765)  
Ending Balance $ 3,216 $ 3,633