CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)	3 Months Ended		9 Months Ended		138 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013
Operating expenses:
Research and development	$ 2,558,975	$ 2,479,471	$ 6,420,790	$ 15,874,135	$ 168,925,636
Sales and marketing	239,083	221,399	839,506	6,943,327	25,085,882
General and administrative	1,047,864	1,169,157	3,849,100	4,530,435	34,752,258
Restructuring	0	2,218,347	0	2,218,347	2,157,795
Total operating expenses	3,845,922	6,088,374	11,109,396	29,566,244	230,921,571
Operating loss	(3,845,922)	(6,088,374)	(11,109,396)	(29,566,244)	(230,921,571)
Interest income	3,239	12,076	13,610	58,444	5,022,723
Interest expense	0	0	0	0	(258,348)
Net loss	$ (3,842,683)	$ (6,076,298)	$ (11,095,786)	$ (29,507,800)	$ (226,157,196)
Net loss per basic and diluted share of common stock (in dollars per share)	$ (0.06)	$ (0.09)	$ (0.17)	$ (0.44)
Weighted average number of basic and diluted common shares outstanding (in shares)	67,208,361	67,040,569	67,126,686	66,837,516