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Significant Accounting Policies (Details Textual) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2012
Contract
Jun. 30, 2011
Jun. 30, 2012
Y
Contract
Significant Accounting Policies (Textual) [Abstract]      
Maximum maturity period for classification of investments as cash equivalents     3 months
Investments other-than-temporary losses        
Number of foreign currency forward contracts 1   1
Estimated life of fixed assets, Minimum     3
Estimated life of fixed assets, Maximum     7
Period of amortization of software development costs     3
Contract loss provisions recorded         
Term of agreement for revenue recognition     2 years
Estimated life of intangible assets, Minimum     5
Estimated life of intangible assets, Maximum     10