Summary of Significant Accounting Policies (Schedule Of Stock-Based Compensation Expense By Statement Of Operations) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Stock-based employee compensation expense	$ 2,214,000	$ 3,256,000
Cost of contract revenue
Stock-based employee compensation expense	34,000	143,000
Cost of product revenue
Stock-based employee compensation expense	54,000	136,000
Research and development expense
Stock-based employee compensation expense	825,000	1,329,000
Sales, marketing, general and administrative expense
Stock-based employee compensation expense	$ 1,301,000	$ 1,648,000