STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Treasury Stock [Member]	Total
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
Issuance of stock options/warrants for compensation and services (in shares)	0
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
Restricted stock expense	$ 0	186,389	0	0	186,389
Options and warrants exercised	$ 10	39,326	0	0	39,336
Options and warrants exercised (in shares)	9,048
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
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
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
Restricted stock expense					626,900
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 (in shares)	100,000
Issuance of common stock for compensation	$ 200	829,800	0	0	830,000
Issuance of common stock for compensation (in shares)	200,000
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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of stock options/warrants for compensation and services	$ 0	7,384,656	0	0	$ 7,384,656
Issuance of stock options/warrants for compensation and services (in shares)	0
Common stock issued in connection with a public offering	$ 10,465	26,769,603	0	0	26,780,068
Common stock issued in connection with a public offering (in shares)	10,465,000
Restricted stock expense					0
Options and warrants exercised	$ 290	589,711	0	0	590,001
Options and warrants exercised (in shares)	292,354
Retirement of treasury stock	$ (199)	(2,612,662)	0	2,612,861	0
Retirement of treasury stock (in shares)	(199,275)
Net loss	$ 0	0	(58,587,190)	0	(58,587,190)
Balance at Dec. 31, 2015	$ 66,480	$ 409,107,292	$ (365,094,774)	$ 0	$ 44,078,998
Balance (in shares) at Dec. 31, 2015	66,480,065				66,480,065