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Common Stock and Stock-Based Compensation Plans (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Equity-based compensation expense included in interim condensed consolidated statements of comprehensive income
Total equity-based compensation expense	$ 1,077	$ 1,171	$ 2,322	$ 2,125
Cost of revenue [Member]
Equity-based compensation expense included in interim condensed consolidated statements of comprehensive income
Total equity-based compensation expense	53	61	104	110
Research and development, net [Member]
Equity-based compensation expense included in interim condensed consolidated statements of comprehensive income
Total equity-based compensation expense	394	484	859	862
Sales and marketing [Member]
Equity-based compensation expense included in interim condensed consolidated statements of comprehensive income
Total equity-based compensation expense	200	255	439	456
General and administrative [Member]
Equity-based compensation expense included in interim condensed consolidated statements of comprehensive income
Total equity-based compensation expense	$ 430	$ 371	$ 920	$ 697

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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