CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $)	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Treasury Stock [Member]	Total
Balance at Dec. 31, 2010	$ 15,700	$ 229,347,262	$ (196,515,749)	$ (2,279,238)	$ 30,567,975
Balance (in shares) at Dec. 31, 2010	15,699,835
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of stock options/warrants for compensation and services	0	1,387,701	0	0	1,387,701
Common stock and warrants issued in connection with a public offering	5,600	6,717,339	0	0	6,722,939
Common stock and warrants issued in connection with a public offering (in shares)	5,600,000
Options and warrants exercised	3	(3)	0	0	0
Options and warrants exercised (in shares)	2,492
Net loss	0	0	(14,424,545)	0	(14,424,545)
Balance at Dec. 31, 2011	21,303	237,452,299	(210,940,294)	(2,279,238)	24,254,070
Balance (in shares) at Dec. 31, 2011	21,302,327
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of stock options/warrants for compensation and services	0	2,391,018	0	0	2,391,018
Common stock and warrants issued in connection with a public offering	9,200	21,467,615	0	0	21,476,815
Common stock and warrants issued in connection with a public offering (in shares)	9,200,000
Issuance of restricted stock for compensation	100	511	0	0	611
Issuance of restricted stock for compensation (in shares)	100,000
Options and warrants exercised	5	7,195	0	0	7,200
Options and warrants exercised (in shares)	5,589
Net loss	0	0	(17,963,873)	0	(17,963,873)
Balance at Dec. 31, 2012	30,608	261,318,638	(228,904,167)	(2,279,238)	30,165,841
Balance (in shares) at Dec. 31, 2012	30,607,916				30,607,916
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of stock options/warrants for compensation and services	0	3,798,717	0	0	3,798,717
Common stock and warrants issued in connection with a public offering	11,500	24,083,030	0	0	24,094,530
Common stock and warrants issued in connection with a public offering (in shares)	11,500,000
Options and warrants exercised	10	39,326	0	0	39,336
Options and warrants exercised (in shares)	9,048
Restricted stock		186,389			186,389
Repurchase of common stock for treasury				(138,009)	(138,009)
Net loss	0	0	(47,485,437)	0	(47,485,437)
Balance at Dec. 31, 2013	$ 42,118	$ 289,426,100	$ (276,389,604)	$ (2,417,247)	$ 10,661,367
Balance (in shares) at Dec. 31, 2013	42,116,964				42,116,964