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Stock-Based Compensation (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Stock-based non-cash compensation expenses
Non-cash stock compensation expense	$ 3,949	$ 6,530	$ 9,496
Cost of revenues [Member]
Stock-based non-cash compensation expenses
Non-cash stock compensation expense	13	31	101
Selling and marketing [Member]
Stock-based non-cash compensation expenses
Non-cash stock compensation expense	865	1,922	2,529
Research and development [Member]
Stock-based non-cash compensation expenses
Non-cash stock compensation expense	765	1,198	2,505
General and administrative [Member]
Stock-based non-cash compensation expenses
Non-cash stock compensation expense	$ 2,306	$ 3,379	$ 4,361

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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