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