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Stock Based Compensation (Details 9) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Schedule of stock-based compensation
Total	$ 3,146	$ 3,555	$ 3,409
Cost of product sales [Member]
Schedule of stock-based compensation
Total	0	0	10
Sales and marketing [Member]
Schedule of stock-based compensation
Total	547	526	722
Research and development [Member]
Schedule of stock-based compensation
Total	756	825	803
General and administrative [Member]
Schedule of stock-based compensation
Total	$ 1,843	$ 2,204	$ 1,874

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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