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Fair Value Measurements of Financial Assets and Liabilities (Detail) (Short Term Investments and Cash Equivalents, USD $)
In Thousands, unless otherwise specified |
Jun. 30, 2012
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Dec. 31, 2011
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| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ||
| Cash Equivalents-Overnight Investments | $ 1,593 | $ 3,190 |
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Fair Value, Inputs, Level 2
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| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | ||
| Cash Equivalents-Overnight Investments | $ 1,593 | $ 3,190 |