STATEMENTS OF STOCKHOLDERS' EQUITY (USD $)	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Treasury Stock [Member]	Total
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 issued in connection with a public offering	9,200	21,467,615	0	0	21,476,815
Common stock 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
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 issued in connection with a public offering	11,500	24,083,030	0	0	24,094,530
Common stock 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
Issuance of restricted stock for compensation	0	186,389	0	0	186,389
Repurchase of common stock for treasury	0	0	0	(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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of stock options/warrants for compensation and services	0	5,139,348	0	0	5,139,348
Issuance of stock options/warrants for compensation and services (in shares)	0
Issuance of common stock for compensation	200	829,800	0	0	830,000
Issuance of common stock for compensation (in shares)	200,000
Common stock issued in connection with a public offering	13,225	80,522,176	0	0	80,535,401
Common stock issued in connection with a public offering (in shares)	13,225,000
Options and warrants exercised	281	431,660	0	0	431,941
Options and warrants exercised (in shares)	280,022
Issuance of restricted stock for compensation	100	626,900	0	0	627,000
Issuance of restricted stock for compensation expense (in shares)	100,000
Repurchase of common stock for treasury	0	0	0	(195,614)	(195,614)
Net loss	0	0	(30,117,980)	0	(30,117,980)
Balance at Dec. 31, 2014	$ 55,924	$ 376,975,984	$ (306,507,584)	$ (2,612,861)	$ 67,911,463
Balance (in shares) at Dec. 31, 2014	55,921,986				55,921,986