Income Taxes And Tax Status (Schedule of Effective Income Tax Rate Reconciliation) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Taxes And Tax Status [Abstract]
Tax benefit at statutory rate	$ (7,313,152)	$ (5,805,502)	$ (8,013,445)
State tax benefit	(752,824)	(597,625)	(824,913)
Increase in valuation allowance	8,144,981	6,482,062	8,870,098
Research and development credit	(96,920)	(19,363)	(186,906)
Other	17,915	(59,572)	155,166
Income Tax Expense (Benefit), Total
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate	34.00%	34.00%	34.00%