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Fair Value Measurements (Details) (Fair Value, Measurements, Recurring [Member], USD $)
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Jun. 30, 2012
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Dec. 31, 2011
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|---|---|---|
| Summary of financial asset measured at fair value | ||
| Fair value financial assets total | $ 20,389 | $ 27,446 |
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Level 2 [Member]
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| Summary of financial asset measured at fair value | ||
| Short-term investments | $ 20,389 | $ 27,446 |