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Share-based Compensation (Details) (USD $)	3 Months Ended		6 Months Ended
Share-based Compensation (Details) (USD $)	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Share-based Compensation
Stock options granted (in shares)	37,475	377,980
Weighted-average estimated fair value of stock options granted (in dollar per share)	$ 0.90	$ 1.87
Share-based Compensation
Share-based Compensation expense	$ 1,288,326	$ 1,389,622	$ 2,644,078	$ 2,583,505
Cost of Sales
Share-based Compensation
Share-based Compensation expense	12,071	14,284	24,065	26,069
Selling, General & Administrative
Share-based Compensation
Share-based Compensation expense	882,769	1,006,303	1,854,589	1,845,228
Research & Development
Share-based Compensation
Share-based Compensation expense	$ 393,486	$ 369,035	$ 765,424	$ 712,208

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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