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Significant Accounting Policies (Details) (USD $)	9 Months Ended
Significant Accounting Policies (Details) (USD $)	Sep. 30, 2012 Contract	Sep. 30, 2011
Property, Plant and Equipment [Line Items]
Estimated life of intangible assets	3 years
Significant Accounting Policies (Textual) [Abstract]
Maximum maturity period for classification of investments as cash equivalents	3 months
Investments other-than-temporary losses	$ 0	$ 0
Number of foreign currency forward contracts	1
Contract loss provisions recorded	$ 0	$ 0
Term of agreement for revenue recognition	2 years
Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated life of fixed assets	7 years
Estimated life of intangible assets	10 years
Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated life of fixed assets	3 years
Estimated life of intangible assets	5 years

The amount of other than temporary impairment losses on investments in debt and equity securities categorized as Available-for-sale which have been recognized in earnings during the period. Such impairment losses consist of other than temporary impairments (OTTI) on equity securities, credit losses on investments in debt securities, and when the entity intends to sell an impaired debt security or it is more likely than not that the entity will be required to sell the impaired debt security before recovery of its amortized cost basis.

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