Quarterly report pursuant to sections 13 or 15(d)

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

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Assets and Liabilities that are Required to be Presented on Balance Sheet at Fair Value (Detail) (Warrant, USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
May 31, 2012
Mar. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Warrant derivative liabilities $ 0 $ 473 $ 452
Fair Value, Inputs, Level 2
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Warrant derivative liabilities     $ 452