Stock-Based Compensation (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Stock-based non-cash compensation expenses
Non-cash stock compensation expense	$ 898	$ 1,155	$ 3,052	$ 5,131
Cost of revenues [Member]
Stock-based non-cash compensation expenses
Non-cash stock compensation expense	3	5	9	27
Selling and marketing [Member]
Stock-based non-cash compensation expenses
Non-cash stock compensation expense	212	336	651	1,431
Research and development [Member]
Stock-based non-cash compensation expenses
Non-cash stock compensation expense	187	153	568	1,003
General and administrative [Member]
Stock-based non-cash compensation expenses
Non-cash stock compensation expense	496	661	1,818	2,670
Restructuring expense [Member]
Stock-based non-cash compensation expenses
Non-cash stock compensation expense			$ 6