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Short-term Investment - Additional Information (Detail) (USD $)
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9 Months Ended |
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Sep. 30, 2012
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| Schedule of Available-for-sale Securities [Line Items] | |
| Available-for-sale securities in a gross unrealized loss position, maturities term | 12 months |
| Other-than-temporary impairments considered | $ 0 |
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- Definition
Available for sale securities in gross unrealized loss position maturities term minimum. No definition available.
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- Definition
The amount by which the fair value of an investment in debt and equity securities categorized as Available-for-sale is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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