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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 |
Jun. 30, 2012
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May 31, 2012
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Mar. 31, 2012
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | |||
| Warrant derivative liabilities | $ 0 | $ 473 | $ 452 |
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Fair Value, Inputs, Level 2
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | |||
| Warrant derivative liabilities | $ 452 |