Income Taxes And Tax Status (Schedule of Effective Income Tax Rate Reconciliation) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Taxes And Tax Status [Abstract]
Tax benefit at statutory rate	$ (9,476,580)	$ (6,909,416)	$ (4,954,940)
State tax benefit	(975,530)	(711,263)	(510,067)
Increase in valuation allowance	10,648,966	7,640,454	5,722,492
Research and development credit	(299,044)	(239,216)	(272,117)
Capital loss	0	0	(38,439)
Other	102,188	219,441	53,071
Income Tax Expense (Benefit), Total	$ 0	$ 0	$ 0
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate	34.00%	34.00%	34.00%