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Cash and cash equivalents and short-term investments (Details Textual)
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12 Months Ended |
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Dec. 31, 2012
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| Investment Maturity Date | Sep. 04, 2013 |
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Minimum [Member]
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| Investments Interest Rate | 0.25% |
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Maximum [Member]
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| Investments Interest Rate | 1.40% |
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- Definition
The maturity date of the investment. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The interest rate for investments that have an interest rate. For fixed rate investments, this indicates the fixed interest rate. No definition available.
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