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Stockholders' Equity (Details 3) (USD $)	12 Months Ended
Stockholders' Equity (Details 3) (USD $)	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Reported share-based compensation
Total stock-based compensation	$ 3,421,506	$ 3,038,300	$ 3,682,675
Indirect manufacturing expense [Member]
Reported share-based compensation
Total stock-based compensation	172,360	121,177	300,787
Sales, general and administrative expenses [Member]
Reported share-based compensation
Total stock-based compensation	2,645,827	2,291,339	2,728,360
Research and development expenses [Member]
Reported share-based compensation
Total stock-based compensation	$ 603,319	$ 625,784	$ 653,528

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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