Consolidated Statements Of Operations (USD $)	12 Months Ended			117 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2011
Operating expenses:
Research and development	$ 37,270,138	$ 30,871,125	$ 23,985,118	$ 145,760,423
Sales and marketing	8,067,709	2,476,494	2,289,451	17,024,576
General and administrative	5,276,146	4,154,944	4,075,663	25,223,673
Total operating expenses	50,613,993	37,502,563	30,350,232	188,008,672
Operating loss	(50,613,993)	(37,502,563)	(30,350,232)	(188,008,672)
Interest income	161,828	242,883	336,850	4,941,519
Interest expense		(70,389)	(149,019)	(258,348)
Other income (expense)			4,390,487
Net loss	$ (50,452,165)	$ (37,330,069)	$ (25,771,914)	$ (183,325,501)
Net loss per basic and diluted share of common stock	$ (0.84)	$ (0.91)	$ (0.82)
Weighted average number of basic and diluted common shares outstanding	60,136,326	41,184,623	31,549,739