Annual report pursuant to section 13 and 15(d)

Assets and Liabilities that are Required to be Presented on Balance Sheet at Fair Value, Recurring (Detail)

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Assets and Liabilities that are Required to be Presented on Balance Sheet at Fair Value, Recurring (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
May 31, 2012
Mar. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Contingent liabilities $ 841    
Contingent Liabilities
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Contingent liabilities 841    
Warrant
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Warrant derivative liabilities 0 473 452
Fair Value, Inputs, Level 1 | Warrant
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Warrant derivative liabilities       
Fair Value, Inputs, Level 2 | Warrant
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Warrant derivative liabilities      452
Fair Value, Inputs, Level 3 | Contingent Liabilities
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Contingent liabilities 841    
Fair Value, Inputs, Level 3 | Warrant
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Warrant derivative liabilities