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Stock-Based Compensation (Details 8) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Schedule of Stock-based Compensation
Total	$ 818	$ 981	$ 1,538	$ 1,765
Sales and marketing [Member]
Schedule of Stock-based Compensation
Total	109	70	224	245
Research and development [Member]
Schedule of Stock-based Compensation
Total	204	233	413	437
General and administrative [Member]
Schedule of Stock-based Compensation
Total	$ 505	$ 678	$ 901	$ 1,083

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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