Statements Of Stockholders' Equity (USD $)	Common Stock [Member]	Additional Paid-In Capital [Member]	Treasury Stock [Member]	Accumulated Deficit [Member]	Total
Stockholders' Equity Attributable to Parent, Beginning Balance at Dec. 31, 2010	$ 5,475	$ 354,052,041	$ (205,999)	$ (343,376,271)	$ 10,475,246
Shares, issued, beginning balance at Dec. 31, 2010	5,474,624
Issuance of common stock and warrants, value	8	(8)
Issuance of common stock and warrants, shares	8,400
Share-based compensation, value		2,487,441			2,487,441
Issuance of stock under purchase plan, value	9	232,382			232,391
Issuance of stock under purchase plan, shares	8,449
Exercise of stock options, value		7,202			7,202
Exercise of options/SAR's, shares	468
Grant of restricted shares, net of forfeitures, value	51	(51)
Grant of restricted shares, net of forfeitures, shares	51,216
Net Loss				(32,031,175)	(32,031,175)
Stockholders' Equity Attributable to Parent, Ending Balance at Dec. 31, 2011	5,543	356,779,007	(205,999)	(375,407,446)	(18,828,895)
Shares, issued, ending balance at Dec. 31, 2011	5,543,157
Issuance of common stock and warrants, value	2,415	10,409,260			10,411,675
Issuance of common stock and warrants, shares	2,415,339
Share-based compensation, value		2,293,731			2,293,731
Issuance of stock under purchase plan, value	10	73,543			73,553
Issuance of stock under purchase plan, shares	10,315
Grant of restricted shares, net of forfeitures, value	20	(20)
Grant of restricted shares, net of forfeitures, shares	19,885
Restricted stock vestings, value	31	(31)
Restricted stock vestings, shares	29,919
Reclassification of warrants to liability		(3,501,863)			(3,501,863)
Net Loss				(9,238,427)	(9,238,427)
Stockholders' Equity Attributable to Parent, Ending Balance at Dec. 31, 2012	8,019	366,053,627	(205,999)	(384,645,873)	(18,790,226)
Shares, issued, ending balance at Dec. 31, 2012	8,018,615
Issuance of common stock and warrants, value	7,743	64,586,770			64,594,513
Issuance of common stock and warrants, shares	7,742,717
Share-based compensation, value		1,050,260			1,050,260
Exercise of options/SAR's, shares					145
Rights offering, value	3,400	10,197,647			10,201,047
Rights offering, shares	3,400,349
Grant of restricted shares, net of forfeitures, value	(62)	62
Grant of restricted shares, net of forfeitures, shares	(61,910)
Restricted stock vestings, value	211	(211)
Restricted stock vestings, shares	211,619
Net Loss				(68,757,589)	(68,757,589)
Stockholders' Equity Attributable to Parent, Ending Balance at Dec. 31, 2013	$ 19,311	$ 441,888,155	$ (205,999)	$ (453,403,462)	$ (11,701,995)
Shares, issued, ending balance at Dec. 31, 2013	19,311,390