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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 compensation expense
Total stock-based compensation	$ 300	$ 605	$ 970	$ 1,444
Cost of revenues [Member]
Stock-based compensation expense
Total stock-based compensation	10	16	36	51
Selling, general and administrative [Member]
Stock-based compensation expense
Total stock-based compensation	205	362	679	887
Research and development [Member]
Stock-based compensation expense
Total stock-based compensation	$ 85	$ 227	$ 255	$ 506

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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