CONDENSED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]
Balance at Dec. 31, 2013	$ 5,253,222	$ 122,449	$ 119,885,371	$ (114,754,598)
Balance (in shares) at Dec. 31, 2013		122,448,707
Net loss	(4,697,931)	$ 0	0	(4,697,931)
Common stock issued:
Employee stock purchase plan	27,557	$ 101	27,456	0
Employee stock purchase plan (in shares)		99,585
Stock-based compensation expense	354,441	$ 0	354,441	0
Balance at Sep. 30, 2014	937,289	$ 122,550	120,267,268	(119,452,529)
Balance (in shares) at Sep. 30, 2014		122,548,292
Balance at Dec. 31, 2013	5,253,222	$ 122,449	119,885,371	(114,754,598)
Balance (in shares) at Dec. 31, 2013		122,448,707
Net loss	6,300,000
Balance at Dec. 31, 2014	4,516,857	$ 172,686	125,434,483	(121,090,312)
Balance (in shares) at Dec. 31, 2014		172,683,342
Net loss	(6,035,490)	$ 0	0	(6,035,490)
Common stock issued:
Private Placement	(7,100)		(7,100)
Horizon Warrant	11,848		11,848
Employee stock purchase plan	16,799	$ 157	16,642	0
Employee stock purchase plan (in shares)		157,705
Stock-based compensation expense	651,791	$ 0	651,791	0
Balance at Sep. 30, 2015	$ (845,295)	$ 172,843	$ 126,107,664	$ (127,125,802)
Balance (in shares) at Sep. 30, 2015		172,841,047