CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)	12 Months Ended			141 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013
Operating expenses:
Research and development	$ 10,367,757	$ 16,744,423	$ 37,270,138	$ 172,872,603
Sales and marketing	1,089,053	7,221,800	8,067,709	25,335,429
General and administrative	4,977,546	5,679,485	5,276,146	35,880,704
Restructuring	0	2,157,795	0	2,157,795
Total operating expenses	16,434,356	31,803,503	50,613,993	236,246,531
Operating loss	(16,434,356)	(31,803,503)	(50,613,993)	(236,246,531)
Interest income	18,123	67,594	161,828	5,027,236
Interest expense	0	0	0	(258,348)
Net loss	$ (16,416,233)	$ (31,735,909)	$ (50,452,165)	$ (231,477,643)
Net loss per basic and diluted share of common stock (in dollars per share)	$ (0.24)	$ (0.47)	$ (0.84)
Weighted average number of basic and diluted common shares outstanding (in shares)	68,825,944	66,892,982	60,136,326