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Stock-Based Compensation (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Total stock-based compensation
Total	$ 624	$ 698
Cost of revenues [Member]
Total stock-based compensation
Total	85	104
Research and development [Member]
Total stock-based compensation
Total	147	140
Sales and marketing [Member]
Total stock-based compensation
Total	106	130
General and administrative [Member]
Total stock-based compensation
Total	$ 286	$ 324

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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