Income Taxes And Tax Status (Tables)

12 Months Ended

Dec. 31, 2013

Income Taxes And Tax Status [Abstract]

Schedule Of Effective Income Tax Rate Reconciliation

	2013		2012		2011
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
	$	0	$	0	$	0

Schedule Of Deferred Tax Assets And Liabilities

	2013		2012
Gross deferred tax assets:
Net operating loss carry-forward	$	94,742,725	$	85,844,921
Research and development credit		7,618,821		7,319,776
Stock compensation		3,548,655		2,882,576
Patents and other		1,828,103		1,770,367
Fixed assets		121,179		125,737
Accrued liabilities		80,204		64,507
Capital loss carry-forward		5,652		38,439
Charitable Contributions		4,500		0
		107,949,839		98,046,323
Less valuation allowance		(107,949,839)		(98,006,927)
		0		39,396
Gross deferred tax liabilities:
Gains on the cash surrender value of life insurance		0		39,396
		0		39,396
Net deferred tax asset	$	0	$	0

Schedule Of Unrecognized Tax Benefits Roll Forward

	For the years ended December 31,
	2013		2012		2011
Unrecognized tax benefits – beginning of year	$	1,369,614		1,369,614		1,369,614
Gross increases – tax positions in prior period		0		0		0
Change in Estimate		0		0		0
Unrecognized tax benefits – end of year	$	1,369,614		1,369,614		1,369,614