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Fair Value Measurement of Assets and Liabilities (Additional Information) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Fair Value Measurement of Assets and Liabilities [Abstract]
Short-term investments	$ 55,756us-gaap_HeldToMaturitySecurities	$ 58,475us-gaap_HeldToMaturitySecurities

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- Definition

Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

+ References

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