Accrued Liabilities (Schedule Of Accrued Liabilities) (Details) (USD $)	Jun. 30, 2012	Dec. 31, 2011
Accrued Liabilities [Abstract]
Accrued salaries, bonus, and benefits	$ 2,966,208	$ 3,229,382
Accrued research and development	19,547	27,044
Accrued legal and other professional fees	58,762	25,000
Other	2,903,185	2,421,740
Total accrued liabilities	$ 5,947,702	$ 5,703,166