Stock Based Compensation (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Stock-based non-cash compensation expenses
Non-cash stock compensation expense	$ 976	$ 1,869	$ 2,154	$ 3,976
Cost of revenues [Member]
Stock-based non-cash compensation expenses
Non-cash stock compensation expense	2	5	6	22
Selling and marketing [Member]
Stock-based non-cash compensation expenses
Non-cash stock compensation expense	222	511	439	1,095
Research and development [Member]
Stock-based non-cash compensation expenses
Non-cash stock compensation expense	195	344	381	850
General and administrative [Member]
Stock-based non-cash compensation expenses
Non-cash stock compensation expense	557	1,009	1,322	2,009
Restructuring expense [Member]
Stock-based non-cash compensation expenses
Non-cash stock compensation expense			$ 6