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Stock-Based Compensation (Details 1) (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 compensation expense
Stock-based compensation expense	$ 1,538	$ 1,232	$ 2,794	$ 2,183
Cost of sales [Member]
Stock-based compensation expense
Stock-based compensation expense	47	36	76	62
Research and development [Member]
Stock-based compensation expense
Stock-based compensation expense	236	186	431	331
Selling, general and administrative [Member]
Stock-based compensation expense
Stock-based compensation expense	$ 1,255	$ 1,010	$ 2,287	$ 1,790

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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